How to directly Print JPG & PNG images without Preview or Printer Dialog from ASP.NET (2023)

Creating/Editing Controllers

Create a new Controller and name it WebClientPrintAPIController and then copy/paste the following code:

using Neodynamic.SDK.Web;using Microsoft.Extensions.Caching.Memory;using Microsoft.AspNetCore.Authorization;[Authorize]public class WebClientPrintAPIController : Controller{//IMPORTANT NOTE >>>>>>>>>>// We're going to use MemoryCache to store users related staff like// the list of printers and they have the WCPP client utility installed// BUT you can change it based on your dev needs!!!// For instance, you could use a Distributed Cache instead!//>>>>>>>>>>>>>>>>>>>>>>>>>private readonly IMemoryCache _MemoryCache;public WebClientPrintAPIController(IMemoryCache memCache){_MemoryCache = memCache;}[AllowAnonymous]public IActionResult ProcessRequest(){//get session IDstring sessionID = HttpContext.Request.Query["sid"].ToString();//get Query Stringstring queryString = HttpContext.Request.QueryString.Value;try{//Determine and get the Type of Request RequestType prType = WebClientPrint.GetProcessRequestType(queryString);if (prType == RequestType.GenPrintScript ||prType == RequestType.GenWcppDetectScript){//Let WebClientPrint to generate the requested scriptbyte[] script = WebClientPrint.GenerateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, HttpContext.Request.Scheme), queryString);return File(script, "application/x-javascript", "WebClientPrintScript");}else if (prType == RequestType.ClientSetWcppVersion){//This request is a ping from the WCPP utility//so store the session ID indicating it has the WCPP installed//also store the WCPP Version if availablestring wcppVersion = HttpContext.Request.Query["wcppVer"];if (string.IsNullOrEmpty(wcppVersion))wcppVersion = "1.0.0.0";_MemoryCache.Set(sessionID + "wcppInstalled", wcppVersion);}else if (prType == RequestType.ClientSetInstalledPrinters){//WCPP Utility is sending the installed printers at client side//so store this info with the specified session IDstring printers = HttpContext.Request.Query["printers"].ToString();if (!string.IsNullOrEmpty(printers) && printers.Length > 0)printers = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printers));_MemoryCache.Set(sessionID + "printers", printers);}else if (prType == RequestType.ClientSetInstalledPrintersInfo){//WCPP Utility is sending the client installed printers with detailed info//so store this info with the specified session ID//Printers Info is in JSON formatstring printersInfo = HttpContext.Request.Form["printersInfoContent"];if (string.IsNullOrEmpty(printersInfo) == false)printersInfo = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printersInfo));_MemoryCache.Set(sessionID + "printersInfo", printersInfo);}else if (prType == RequestType.ClientGetWcppVersion){//return the WCPP version for the specified sid if anybool sidWcppVersion = (_MemoryCache.Get<string>(sessionID + "wcppInstalled") != null);return Ok(sidWcppVersion ? _MemoryCache.Get<string>(sessionID + "wcppInstalled") : "");}else if (prType == RequestType.ClientGetInstalledPrinters){//return the installed printers for the specified sid if anybool sidHasPrinters = (_MemoryCache.Get<string>(sessionID + "printers") != null);return Ok(sidHasPrinters ? _MemoryCache.Get<string>(sessionID + "printers") : "");}else if (prType == RequestType.ClientGetInstalledPrintersInfo){//return the installed printers with detailed info for the specified Session ID (sid) if anybool sidHasPrinters = (_MemoryCache.Get<string>(sessionID + "printersInfo") != null);return Ok(sidHasPrinters ? _MemoryCache.Get<string>(sessionID + "printersInfo") : "");}}catch{return BadRequest();}return Ok();}}

Edit the HomeController to the following code:

public class HomeController : Controller{ public IActionResult Index() { ViewData["WCPPDetectionScript"] = Neodynamic.SDK.Web.WebClientPrint.CreateWcppDetectionScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, Url.ActionContext.HttpContext.Request.Scheme), Url.ActionContext.HttpContext.Session.Id); return View(); } public IActionResult PrintImage() { return View(); }}

Add a new Controller and name it PrintImageController and paste the following code:

using Neodynamic.SDK.Web;public class PrintImageController : Controller{ private readonly IHostingEnvironment _hostEnvironment; public PrintImageController(IHostingEnvironment hostEnvironment) { _hostEnvironment = hostEnvironment; } public IActionResult Index() { ViewData["WCPScript"] = Neodynamic.SDK.Web.WebClientPrint.CreateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, Url.ActionContext.HttpContext.Request.Scheme), Url.Action("PrintFile", "PrintImage", null, Url.ActionContext.HttpContext.Request.Scheme), Url.ActionContext.HttpContext.Session.Id); return View(); }[Microsoft.AspNetCore.Authorization.AllowAnonymous] public IActionResult PrintFile(string useDefaultPrinter, string printerName){//full path of the image file to be printed string imgFilePath = @"c:\myImage.jpg"; //create a temp file name for our image file... string fileName = "MyFile-" + Guid.NewGuid().ToString("N") + System.IO.Path.GetExtension(imgFilePath); //Create a PrintFile object with the image file PrintFile file = new PrintFile(imgFilePath, fileName); //Create a ClientPrintJob and send it back to the client! ClientPrintJob cpj = new ClientPrintJob(); //set file to print... cpj.PrintFile = file;//set client printer...if (useDefaultPrinter == "checked" || printerName == "null")cpj.ClientPrinter = new DefaultPrinter();elsecpj.ClientPrinter = new InstalledPrinter(printerName); return File(cpj.GetContent(), "application/octet-stream"); }}

Creating/Editing Views

The default View is for detecting whether the client machine has the WebClientPrint Processor (WCPP) Utility installed. Edit the Views / Shared / _Layout.cshtml file and add the folowing section to the BODY:

Be sure this View links to jQuery 1.4.1+ file!

<body> ... @RenderSection("scripts", required: false)...</body>

Edit the Views / Home / Index.cshtml file and copy/paste the folowing code:

@{ ViewBag.Title = "Home Page";}<div id="msgInProgress"> <div id="mySpinner" style="width:32px;height:32px"></div> <br /> <h3>Detecting WCPP utility at client side...</h3> <h3>Please wait a few seconds...</h3> <br /></div><div id="msgInstallWCPP" style="display:none;"> <h3>#1 Install WebClientPrint Processor (WCPP)!</h3> <p> <strong>WCPP is a native app (without any dependencies!)</strong> that handles all print jobs generated by the <strong>WebClientPrint for ASP.NET component</strong> at the server side. The WCPP is in charge of the whole printing process and can be installed on <strong>Windows, Linux, Mac & Raspberry Pi!</strong> </p> <p> <a href="//www.neodynamic.com/downloads/wcpp/" target="_blank" >Download and Install WCPP from Neodynamic website</a><br /> </p> <h3>#2 After installing WCPP...</h3> <p> <a asp-controller="PrintImage" asp-action="Index" >You can go and test the printing page...</a> </p></div>@section scripts{ <script type="text/javascript"> var wcppPingTimeout_ms = 60000; //60 sec var wcppPingTimeoutStep_ms = 500; //0.5 sec function wcppDetectOnSuccess(){ // WCPP utility is installed at the client side // redirect to WebClientPrint sample page // get WCPP version var wcppVer = arguments[0]; if(wcppVer.substring(0, 1) == "6") window.location.href = '@Url.Action("Index", "PrintImage")'; else //force to install WCPP v6.0 wcppDetectOnFailure(); } function wcppDetectOnFailure() { // It seems WCPP is not installed at the client side // ask the user to install it $('#msgInProgress').hide(); $('#msgInstallWCPP').show(); }</script>@* WCPP detection script generated by HomeController *@@Html.Raw(ViewData["WCPPDetectionScript"]) }

Add a new View with the following name and under such folders: Views / PrintImage / Index.cshtml Then, copy/paste the folowing code:

<h3>Print image file</h3><div><label class="checkbox"><input type="checkbox" id="useDefaultPrinter" /> <strong>Print to Default printer</strong> or...</label></div><div id="loadPrinters">Click to load and select one of the installed printers!<br /> <input type="button" onclick="javascript:jsWebClientPrint.getPrinters();" value="Load installed printers..." /><br /><br /></div><div id="installedPrinters" style="visibility:hidden"><label for="installedPrinterName">Select an installed Printer:</label><select name="installedPrinterName" id="installedPrinterName"></select></div><script type="text/javascript">var wcppGetPrintersTimeout_ms = 60000; //60 sec var wcppGetPrintersTimeoutStep_ms = 500; //0.5 secfunction wcpGetPrintersOnSuccess() {// Display client installed printersif (arguments[0].length > 0) {var p = arguments[0].split("|");var options = '';for (var i = 0; i < p.length; i++) {options += '<option>' + p[i] + '</option>';}$('#installedPrinters').css('visibility', 'visible');$('#installedPrinterName').html(options);$('#installedPrinterName').focus();$('#loadPrinters').hide();} else {alert("No printers are installed in your system.");}}function wcpGetPrintersOnFailure() {// Do something if printers cannot be got from the clientalert("No printers are installed in your system.");}</script><br /><input type="button" style="font-size:18px" onclick="javascript:jsWebClientPrint.print('useDefaultPrinter=' + $('#useDefaultPrinter').attr('checked') + '&printerName=' + $('#installedPrinterName').val());" value="Print Image..." />@section scripts{ @* Register the WebClientPrint script code generated by PrintImageController. *@@Html.Raw(ViewData["WCPScript"]); }

Creating/Editing Controllers

Create a new Controller and name it WebClientPrintAPIController and then copy/paste the following code:

public class WebClientPrintAPIController : Controller{ //********************************* // IMPORTANT NOTE // In this sample we store users related stuff (like // the list of printers and whether they have the WCPP // client utility installed) in the Application cache // object part of ASP.NET BUT you can change it to // another different storage (like a DB or file server)! // which will be required in Load Balacing scenarios //********************************* [AllowAnonymous] public void ProcessRequest() { //get session ID string sessionID = (HttpContext.Request["sid"] != null ? HttpContext.Request["sid"] : null); //get Query String string queryString = HttpContext.Request.Url.Query; try { //Determine and get the Type of Request RequestType prType = WebClientPrint.GetProcessRequestType(queryString); if (prType == RequestType.GenPrintScript || prType == RequestType.GenWcppDetectScript) { //Let WebClientPrint to generate the requested script byte[] script = WebClientPrint.GenerateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, HttpContext.Request.Url.Scheme), queryString); HttpContext.Response.ContentType = "text/javascript"; HttpContext.Response.BinaryWrite(script); HttpContext.Response.End(); } else if (prType == RequestType.ClientSetWcppVersion) { //This request is a ping from the WCPP utility //so store the session ID indicating it has the WCPP installed //also store the WCPP Version if available string wcppVersion = HttpContext.Request["wcppVer"]; if (string.IsNullOrEmpty(wcppVersion)) wcppVersion = "1.0.0.0"; HttpContext.Application.Set(sessionID + "wcppInstalled", wcppVersion); } else if (prType == RequestType.ClientSetInstalledPrinters) { //WCPP Utility is sending the installed printers at client side //so store this info with the specified session ID string printers = HttpContext.Request["printers"]; if (string.IsNullOrEmpty(printers) == false) printers = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printers)); HttpContext.Application.Set(sessionID + "printers", printers); } else if (prType == RequestType.ClientSetInstalledPrintersInfo) { //WCPP Utility is sending the client installed printers with detailed info //so store this info with the specified session ID //Printers Info is in JSON format string printersInfo = HttpContext.Request.Form["printersInfoContent"]; if (string.IsNullOrEmpty(printersInfo) == false) printersInfo = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printersInfo)); HttpContext.Application.Set(sessionID + "printersInfo", printersInfo); } else if (prType == RequestType.ClientGetWcppVersion) { //return the WCPP version for the specified sid if any bool sidWcppVersion = (HttpContext.Application.Get(sessionID + "wcppInstalled") != null); HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write((sidWcppVersion ? HttpContext.Application.Get(sessionID + "wcppInstalled") : "")); HttpContext.Response.End(); } else if (prType == RequestType.ClientGetInstalledPrinters) { //return the installed printers for the specified sid if any bool sidHasPrinters = (HttpContext.Application.Get(sessionID + "printers") != null); HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write((sidHasPrinters ? HttpContext.Application.Get(sessionID + "printers") : "")); HttpContext.Response.End(); } else if (prType == RequestType.ClientGetInstalledPrintersInfo) { //return the installed printers with detailed info for the specified Session ID (sid) if any bool sidHasPrinters = (HttpContext.Application[sessionID + "printersInfo"] != null); HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write(sidHasPrinters ? HttpContext.Application[sessionID + "printersInfo"] : ""); } } catch (Exception ex) { HttpContext.Response.StatusCode = 500; HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write(ex.Message + " - StackTrace: " + ex.StackTrace); HttpContext.Response.End(); } }}

Edit the HomeController to the following code:

public class HomeController : Controller{ public ActionResult Index() { ViewBag.WCPPDetectionScript = Neodynamic.SDK.Web.WebClientPrint.CreateWcppDetectionScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, HttpContext.Request.Url.Scheme), HttpContext.Session.SessionID); return View(); } public ActionResult PrintImage() { return View(); }}

Add a new Controller and name it PrintImageController and paste the following code:

using Neodynamic.SDK.Web;public class PrintImageController : Controller{public ActionResult Index(){ViewBag.WCPScript = WebClientPrint.CreateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, HttpContext.Request.Url.Scheme), Url.Action("PrintFile", "PrintImage", null, HttpContext.Request.Url.Scheme), HttpContext.Session.SessionID);return View();}[AllowAnonymous]public void PrintFile(string useDefaultPrinter, string printerName){//full path of the image file to be printed string imgFilePath = @"c:\myImage.jpg"; //create a temp file name for our image file... string fileName = "MyFile-" + Guid.NewGuid().ToString("N") + System.IO.Path.GetExtension(imgFilePath); //Create a PrintFile object with the image file PrintFile file = new PrintFile(imgFilePath, fileName); //Create a ClientPrintJob and send it back to the client! ClientPrintJob cpj = new ClientPrintJob(); //set file to print... cpj.PrintFile = file;//set client printer...if (useDefaultPrinter == "checked" || printerName == "null")cpj.ClientPrinter = new DefaultPrinter();elsecpj.ClientPrinter = new InstalledPrinter(printerName);//send it...System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream";System.Web.HttpContext.Current.Response.BinaryWrite(cpj.GetContent());System.Web.HttpContext.Current.Response.End();}}

Creating/Editing Views

The default View is for detecting whether the client machine has the WebClientPrint Processor (WCPP) Utility installed. Edit the Views / Shared / _Layout.cshtml file and add the folowing section to the BODY:

Be sure this View links to jQuery 1.4.1+ file!

<body> ... @RenderSection("scripts", required: false)...</body>

Edit the Views / Home / Index.cshtml file and copy/paste the folowing code:

@{ ViewBag.Title = "Home Page";}<div id="msgInProgress"> <div id="mySpinner" style="width:32px;height:32px"></div> <br /> <h3>Detecting WCPP utility at client side...</h3> <h3>Please wait a few seconds...</h3> <br /></div><div id="msgInstallWCPP" style="display:none;"> <h3>#1 Install WebClientPrint Processor (WCPP)!</h3> <p> <strong>WCPP is a native app (without any dependencies!)</strong> that handles all print jobs generated by the <strong>WebClientPrint for ASP.NET component</strong> at the server side. The WCPP is in charge of the whole printing process and can be installed on <strong>Windows, Linux, Mac & Raspberry Pi!</strong> </p> <p> <a href="//www.neodynamic.com/downloads/wcpp/" target="_blank" >Download and Install WCPP from Neodynamic website</a><br /> </p> <h3>#2 After installing WCPP...</h3> <p> <a href="@Url.Action("Index", "PrintImage")" >You can go and test the printing page...</a> </p></div>@section scripts{ <script type="text/javascript"> var wcppPingTimeout_ms = 60000; //60 sec var wcppPingTimeoutStep_ms = 500; //0.5 sec function wcppDetectOnSuccess(){ // WCPP utility is installed at the client side // redirect to WebClientPrint sample page // get WCPP version var wcppVer = arguments[0]; if(wcppVer.substring(0, 1) == "6") window.location.href = '@Url.Action("Index", "PrintImage")'; else //force to install WCPP v6.0 wcppDetectOnFailure(); } function wcppDetectOnFailure() { // It seems WCPP is not installed at the client side // ask the user to install it $('#msgInProgress').hide(); $('#msgInstallWCPP').show(); }</script>@* WCPP detection script generated by HomeController *@@Html.Raw(ViewBag.WCPPDetectionScript) }

Add a new View with the following name and under such folders: Views / PrintImage / Index.cshtml Then, copy/paste the folowing code:

<h3>Print image file</h3><div><label class="checkbox"><input type="checkbox" id="useDefaultPrinter" /> <strong>Print to Default printer</strong> or...</label></div><div id="loadPrinters">Click to load and select one of the installed printers!<br /> <input type="button" onclick="javascript:jsWebClientPrint.getPrinters();" value="Load installed printers..." /><br /><br /></div><div id="installedPrinters" style="visibility:hidden"><label for="installedPrinterName">Select an installed Printer:</label><select name="installedPrinterName" id="installedPrinterName"></select></div><script type="text/javascript">var wcppGetPrintersTimeout_ms = 60000; //60 sec var wcppGetPrintersTimeoutStep_ms = 500; //0.5 secfunction wcpGetPrintersOnSuccess() {// Display client installed printersif (arguments[0].length > 0) {var p = arguments[0].split("|");var options = '';for (var i = 0; i < p.length; i++) {options += '<option>' + p[i] + '</option>';}$('#installedPrinters').css('visibility', 'visible');$('#installedPrinterName').html(options);$('#installedPrinterName').focus();$('#loadPrinters').hide();} else {alert("No printers are installed in your system.");}}function wcpGetPrintersOnFailure() {// Do something if printers cannot be got from the clientalert("No printers are installed in your system.");}</script><br /><input type="button" style="font-size:18px" onclick="javascript:jsWebClientPrint.print('useDefaultPrinter=' + $('#useDefaultPrinter').attr('checked') + '&printerName=' + $('#installedPrinterName').val());" value="Print Image..." />@section scripts{ @* Register the WebClientPrint script code generated by PrintImageController. *@@Html.Raw(ViewBag.WCPScript); }

Creating/Editing Controllers

Create a new Controller and name it WebClientPrintAPIController and then copy/paste the following code:

Imports Neodynamic.SDK.Web Namespace Controllers Public Class WebClientPrintAPIController Inherits Controller ' GET: WebClientPrintAPI Function Index() As ActionResult Return View() End Function '********************************* ' IMPORTANT NOTE ' In this sample we store users related stuff (like ' the list of printers and whether they have the WCPP ' client utility installed) in the Application cache ' object part of ASP.NET BUT you can change it to ' another different storage (like a DB or file server)! ' which will be required in Load Balacing scenarios '********************************* <AllowAnonymous> Public Sub ProcessRequest() 'get session ID Dim sessionID As String = (If(HttpContext.Request("sid") IsNot Nothing, HttpContext.Request("sid"), Nothing)) 'get Query String Dim queryString As String = HttpContext.Request.Url.Query Try 'Determine and get the Type of Request Dim prType As RequestType = WebClientPrint.GetProcessRequestType(queryString) If prType = RequestType.GenPrintScript OrElse prType = RequestType.GenWcppDetectScript Then 'Let WebClientPrint to generate the requested script Dim script As Byte() = WebClientPrint.GenerateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", Nothing, HttpContext.Request.Url.Scheme), queryString) HttpContext.Response.ContentType = "text/javascript" HttpContext.Response.BinaryWrite(script) HttpContext.Response.End() ElseIf prType = RequestType.ClientSetWcppVersion Then 'This request is a ping from the WCPP utility 'so store the session ID indicating it has the WCPP installed 'also store the WCPP Version if available Dim wcppVersion As String = HttpContext.Request("wcppVer") If String.IsNullOrEmpty(wcppVersion) Then wcppVersion = "1.0.0.0" End If HttpContext.Application.Set(sessionID & "wcppInstalled", wcppVersion) ElseIf prType = RequestType.ClientSetInstalledPrinters Then 'WCPP Utility is sending the installed printers at client side 'so store this info with the specified session ID Dim printers As String = HttpContext.Request("printers") If String.IsNullOrEmpty(printers) = False Then printers = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printers)) End If HttpContext.Application.Set(sessionID & "printers", printers) ElseIf prType = RequestType.ClientSetInstalledPrintersInfo Then 'WCPP Utility is sending the installed printers at client side 'so store this info with the specified session ID 'Printers Info is in JSON format Dim printersInfo As String = HttpContext.Request.Form("printersInfoContent") If Not String.IsNullOrEmpty(printersInfo) Then printersInfo = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printersInfo)) End If HttpContext.Application.Set(sessionID & "printersInfo", printersInfo) ElseIf prType = RequestType.ClientGetWcppVersion Then 'return the WCPP version for the specified sid if any Dim sidWcppVersion As Boolean = (HttpContext.Application(sessionID & "wcppInstalled") IsNot Nothing) HttpContext.Response.ContentType = "text/plain" If (sidWcppVersion) Then HttpContext.Response.Write(HttpContext.Application(sessionID & "wcppInstalled").ToString()) End If HttpContext.Response.End() ElseIf prType = RequestType.ClientGetInstalledPrinters Then 'return the installed printers for the specified sid if any Dim sidHasPrinters As Boolean = (HttpContext.Application(sessionID & "printers") IsNot Nothing) HttpContext.Response.ContentType = "text/plain" If (sidHasPrinters) Then HttpContext.Response.Write(HttpContext.Application(sessionID & "printers").ToString()) End If HttpContext.Response.End() ElseIf prType = RequestType.ClientGetInstalledPrintersInfo Then 'return the installed printers with detailed info for the specified Session ID (sid) if any Dim sidHasPrinters As Boolean = (HttpContext.Application(sessionID & "printersInfo") IsNot Nothing) HttpContext.Response.ContentType = "text/plain" If (sidHasPrinters) Then HttpContext.Response.Write(HttpContext.Application(sessionID & "printersInfo").ToString()) End If HttpContext.Response.End() End If Catch ex As Exception HttpContext.Response.StatusCode = 500 HttpContext.Response.ContentType = "text/plain" HttpContext.Response.Write(ex.Message + " - StackTrace: " + ex.StackTrace) HttpContext.Response.End() End Try End Sub End ClassEnd Namespace

Edit the HomeController to the following code:

Public Class HomeController Inherits System.Web.Mvc.Controller Function Index() As ActionResult ViewData("WCPPDetectionScript") = Neodynamic.SDK.Web.WebClientPrint.CreateWcppDetectionScript(Url.Action("ProcessRequest", "WebClientPrintAPI", Nothing, HttpContext.Request.Url.Scheme), HttpContext.Session.SessionID) Return View() End Function Function PrintImage() As ActionResult Return View() End FunctionEnd Class

Add a new Controller and name it PrintImageController and paste the following code:

Imports Neodynamic.SDK.WebNamespace Controllers Public Class PrintImageController Inherits Controller Function Index() As ActionResult ViewData("WCPScript") = Neodynamic.SDK.Web.WebClientPrint.CreateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", Nothing, HttpContext.Request.Url.Scheme), Url.Action("PrintFile", "PrintImage", Nothing, HttpContext.Request.Url.Scheme), HttpContext.Session.SessionID) Return View() End Function <AllowAnonymous> Public Sub PrintFile(useDefaultPrinter As String, printerName As String) 'full path of the image file to be printed Dim imgFilePath As String = "c:\myImage.jpg" 'create a temp file name for our image file... Dim fileName As String = "MyFile-" + Guid.NewGuid().ToString("N") + System.IO.Path.GetExtension(imgFilePath) 'Create a PrintFile object with the image file Dim file As New PrintFile(imgFilePath, fileName) 'Create a ClientPrintJob and send it back to the client! Dim cpj As New ClientPrintJob() 'set file to print... cpj.PrintFile = file If (useDefaultPrinter = "checked" OrElse printerName = "null") Then cpj.ClientPrinter = New DefaultPrinter() Else cpj.ClientPrinter = New InstalledPrinter(System.Web.HttpUtility.UrlDecode(printerName)) End If System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream" System.Web.HttpContext.Current.Response.BinaryWrite(cpj.GetContent()) System.Web.HttpContext.Current.Response.End() End Sub End ClassEnd Namespace

Creating/Editing Views

The default View is for detecting whether the client machine has the WebClientPrint Processor (WCPP) Utility installed. Edit the Views / Shared / _Layout.vbhtml file and add the folowing section to the BODY:

Be sure this View links to jQuery 1.4.1+ file!

<body> ... @RenderSection("scripts", required: False)...</body>

Edit the Views / Home / Index.vbhtml file and copy/paste the folowing code:

@Code ViewData("Title") = "Home Page"End Code<div id="msgInProgress"> <div id="mySpinner" style="width:32px;height:32px"></div> <br /> <h3>Detecting WCPP utility at client side...</h3> <h3>Please wait a few seconds...</h3> <br /></div><div id="msgInstallWCPP" style="display:none;"> <h3>#1 Install WebClientPrint Processor (WCPP)!</h3> <p> <strong>WCPP is a native app (without any dependencies!)</strong> that handles all print jobs generated by the <strong>WebClientPrint for ASP.NET component</strong> at the server side. The WCPP is in charge of the whole printing process and can be installed on <strong>Windows, Linux, Mac & Raspberry Pi!</strong> </p> <p> <a href="//www.neodynamic.com/downloads/wcpp/" target="_blank" >Download and Install WCPP from Neodynamic website</a><br /> </p> <h3>#2 After installing WCPP...</h3> <p> <a href="@Url.Action("Index", "PrintImage")" >You can go and test the printing page...</a> </p></div>@section scripts <script type="text/javascript"> var wcppPingTimeout_ms = 60000; //60 sec var wcppPingTimeoutStep_ms = 500; //0.5 sec function wcppDetectOnSuccess(){ // WCPP utility is installed at the client side // redirect to WebClientPrint sample page // get WCPP version var wcppVer = arguments[0]; if(wcppVer.substring(0, 1) == "6") window.location.href = '@Url.Action("Index", "PrintImage")'; else //force to install WCPP v6.0 wcppDetectOnFailure(); } function wcppDetectOnFailure() { // It seems WCPP is not installed at the client side // ask the user to install it $('#msgInProgress').hide(); $('#msgInstallWCPP').show(); }</script>@* WCPP detection script generated by HomeController *@@Html.Raw(ViewData("WCPPDetectionScript")) }End Section

Add a new View with the following name and under such folders: Views / PrintImage / Index.vbhtml Then, copy/paste the folowing code:

<h3>Print image file</h3><div><label class="checkbox"><input type="checkbox" id="useDefaultPrinter" /> <strong>Print to Default printer</strong> or...</label></div><div id="loadPrinters">Click to load and select one of the installed printers!<br /> <input type="button" onclick="javascript:jsWebClientPrint.getPrinters();" value="Load installed printers..." /><br /><br /></div><div id="installedPrinters" style="visibility:hidden"><label for="installedPrinterName">Select an installed Printer:</label><select name="installedPrinterName" id="installedPrinterName"></select></div><script type="text/javascript">var wcppGetPrintersTimeout_ms = 60000; //60 sec var wcppGetPrintersTimeoutStep_ms = 500; //0.5 secfunction wcpGetPrintersOnSuccess() {// Display client installed printersif (arguments[0].length > 0) {var p = arguments[0].split("|");var options = '';for (var i = 0; i < p.length; i++) {options += '<option>' + p[i] + '</option>';}$('#installedPrinters').css('visibility', 'visible');$('#installedPrinterName').html(options);$('#installedPrinterName').focus();$('#loadPrinters').hide();} else {alert("No printers are installed in your system.");}}function wcpGetPrintersOnFailure() {// Do something if printers cannot be got from the clientalert("No printers are installed in your system.");}</script><br /><input type="button" style="font-size:18px" onclick="javascript:jsWebClientPrint.print('useDefaultPrinter=' + $('#useDefaultPrinter').attr('checked') + '&printerName=' + $('#installedPrinterName').val());" value="Print Image..." />@section scripts @* Register the WebClientPrint script code generated by PrintImageController. *@ @Html.Raw(ViewData("WCPScript"))@end section

Creating/Editing Controllers

Create a new Controller and name it WebClientPrintAPIController and then copy/paste the following code:

public class WebClientPrintAPIController : Controller{ //********************************* // IMPORTANT NOTE // In this sample we store users related stuff (like // the list of printers and whether they have the WCPP // client utility installed) in the Application cache // object part of ASP.NET BUT you can change it to // another different storage (like a DB or file server)! // which will be required in Load Balacing scenarios //********************************* [AllowAnonymous] public void ProcessRequest() { //get session ID string sessionID = (HttpContext.Request["sid"] != null ? HttpContext.Request["sid"] : null); //get Query String string queryString = HttpContext.Request.Url.Query; try { //Determine and get the Type of Request RequestType prType = WebClientPrint.GetProcessRequestType(queryString); if (prType == RequestType.GenPrintScript || prType == RequestType.GenWcppDetectScript) { //Let WebClientPrint to generate the requested script byte[] script = WebClientPrint.GenerateScript(Url.Action("ProcessRequest", "WebClientPrintAPI", null, HttpContext.Request.Url.Scheme), queryString); HttpContext.Response.ContentType = "text/javascript"; HttpContext.Response.BinaryWrite(script); HttpContext.Response.End(); } else if (prType == RequestType.ClientSetWcppVersion) { //This request is a ping from the WCPP utility //so store the session ID indicating it has the WCPP installed //also store the WCPP Version if available string wcppVersion = HttpContext.Request["wcppVer"]; if (string.IsNullOrEmpty(wcppVersion)) wcppVersion = "1.0.0.0"; HttpContext.Application.Set(sessionID + "wcppInstalled", wcppVersion); } else if (prType == RequestType.ClientSetInstalledPrinters) { //WCPP Utility is sending the installed printers at client side //so store this info with the specified session ID string printers = HttpContext.Request["printers"]; if (string.IsNullOrEmpty(printers) == false) printers = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printers)); HttpContext.Application.Set(sessionID + "printers", printers); } else if (prType == RequestType.ClientSetInstalledPrintersInfo) { //WCPP Utility is sending the client installed printers with detailed info //so store this info with the specified session ID //Printers Info is in JSON format string printersInfo = HttpContext.Request.Form["printersInfoContent"]; if (string.IsNullOrEmpty(printersInfo) == false) printersInfo = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printersInfo)); HttpContext.Application.Set(sessionID + "printersInfo", printersInfo); } else if (prType == RequestType.ClientGetWcppVersion) { //return the WCPP version for the specified sid if any bool sidWcppVersion = (HttpContext.Application.Get(sessionID + "wcppInstalled") != null); HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write((sidWcppVersion ? HttpContext.Application.Get(sessionID + "wcppInstalled") : "")); HttpContext.Response.End(); } else if (prType == RequestType.ClientGetInstalledPrinters) { //return the installed printers for the specified sid if any bool sidHasPrinters = (HttpContext.Application.Get(sessionID + "printers") != null); HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write((sidHasPrinters ? HttpContext.Application.Get(sessionID + "printers") : "")); HttpContext.Response.End(); } else if (prType == RequestType.ClientGetInstalledPrintersInfo) { //return the installed printers with detailed info for the specified Session ID (sid) if any bool sidHasPrinters = (HttpContext.Application[sessionID + "printersInfo"] != null); HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write(sidHasPrinters ? HttpContext.Application[sessionID + "printersInfo"] : ""); } } catch (Exception ex) { HttpContext.Response.StatusCode = 500; HttpContext.Response.ContentType = "text/plain"; HttpContext.Response.Write(ex.Message + " - StackTrace: " + ex.StackTrace); HttpContext.Response.End(); } } }

Add a new Controller and name it PrintImageController and paste the following code:

using Neodynamic.SDK.Web;public class PrintImageController : Controller{public ActionResult Index(){return View();}[AllowAnonymous]public void PrintFile(string useDefaultPrinter, string printerName){ //full path of the image file to be printed string imgFilePath = @"c:\myImage.jpg"; //create a temp file name for our image file... string fileName = "MyFile-" + Guid.NewGuid().ToString("N") + System.IO.Path.GetExtension(imgFilePath); //Create a PrintFile object with the image file PrintFile file = new PrintFile(imgFilePath, fileName); //Create a ClientPrintJob and send it back to the client! ClientPrintJob cpj = new ClientPrintJob(); //set file to print... cpj.PrintFile = file;//set client printer...if (useDefaultPrinter == "checked" || printerName == "null")cpj.ClientPrinter = new DefaultPrinter();elsecpj.ClientPrinter = new InstalledPrinter(printerName);//send it...System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream";System.Web.HttpContext.Current.Response.BinaryWrite(cpj.GetContent());System.Web.HttpContext.Current.Response.End();}}

Creating SPA by using AngularJS

Create a new index.html file that will act as our view for detecting whether the client machine has the WebClientPrint Processor (WCPP) Utility installed as well as for listing client printers and to finally perform client side printing. This SPA features two parts or sections, one for "Detecting WCPP" and the other one for "Client side printing". The ClientPrintJob is generated by the controller created above from the Web API server side code. Copy/Paste the following markup:

Be sure this html file links to jQuery 1.4.1+ and to AngularJS 1.6.4+ files!

<!DOCTYPE html><html><head> <title></title><meta charset="utf-8" /> <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script></head><body> <div ng-app="myApp" ng-controller="myCtrl"> <div id="wcppDetection"> <div id="msgInProgress"> <div id="mySpinner" style="width:32px;height:32px"></div> <br /> <h3>Detecting WCPP utility at client side...</h3> <h3>Please wait a few seconds...</h3> <br /> </div> <div id="msgInstallWCPP" style="display:none;"> <h3>#1 Install WebClientPrint Processor (WCPP)!</h3> <p> <strong>WCPP is a native app (without any dependencies!)</strong> that handles all print jobs generated by the <strong>WebClientPrint for ASP.NET component</strong> at the server side. The WCPP is in charge of the whole printing process and can be installed on <strong>Windows, Linux, Mac & Raspberry Pi!</strong> </p> <p> <a href="//www.neodynamic.com/downloads/wcpp/" target="_blank">Download and Install WCPP from Neodynamic website</a><br /> </p> <h3>#2 After installing WCPP...</h3> <p> <a href="#" onclick="javascript:$('#wcppDetection').hide();$('#printSection').show();">You can go and test the printing page...</a> </p> <script type="text/javascript"> var wcppPingTimeout_ms = 60000; //60 sec var wcppPingTimeoutStep_ms = 500; //0.5 sec function wcppDetectOnSuccess() { // WCPP utility is installed at the client side // redirect to WebClientPrint sample page // get WCPP version var wcppVer = arguments[0]; if (wcppVer.substring(0, 1) == "6"){ $('#wcppDetection').hide(); $('#printSection').show(); } else //force to install WCPP v6.0 wcppDetectOnFailure(); } function wcppDetectOnFailure() { // It seems WCPP is not installed at the client side // ask the user to install it $('#msgInProgress').hide(); $('#msgInstallWCPP').show(); } </script> </div> <input type="hidden" id="sid" name="sid" ng-value="sid" /> <script> $(function () { //Gen script for WCPP detection $.getScript('/WebClientPrintAPI/ProcessRequest?d=' + $('#sid').val()); }); </script> </div> <div id="printSection" style="display:none;"> <h3>Print Image</h3> <div> <label class="checkbox"> <input type="checkbox" id="useDefaultPrinter" /> <strong>Print to Default printer</strong> or... </label> </div> <div id="loadPrinters"> Click to load and select one of the installed printers! <br /> <input type="button" onclick="javascript:jsWebClientPrint.getPrinters();" value="Load installed printers..." /> <br /><br /> </div> <div id="installedPrinters" style="visibility:hidden"> <label for="installedPrinterName">Select an installed Printer:</label> <select name="installedPrinterName" id="installedPrinterName"></select> </div> <script type="text/javascript"> var wcppGetPrintersTimeout_ms = 60000; //60 sec var wcppGetPrintersTimeoutStep_ms = 500; //0.5 sec function wcpGetPrintersOnSuccess() { // Display client installed printers if (arguments[0].length > 0) { var p = arguments[0].split("|"); var options = ''; for (var i = 0; i < p.length; i++) { options += '<option>' + p[i] + '</option>'; } $('#installedPrinters').css('visibility', 'visible'); $('#installedPrinterName').html(options); $('#installedPrinterName').focus(); $('#loadPrinters').hide(); } else { alert("No printers are installed in your system."); } } function wcpGetPrintersOnFailure() { // Do something if printers cannot be got from the client alert("No printers are installed in your system."); } </script> <br /> <input type="button" style="font-size:18px" onclick="javascript:jsWebClientPrint.print('useDefaultPrinter=' + $('#useDefaultPrinter').attr('checked') + '&printerName=' + $('#installedPrinterName').val());" value="Print Image..." /> <script> $(function () { // Create Base64 Object var Base64 = { _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", encode: function (e) { var t = ""; var n, r, i, s, o, u, a; var f = 0; e = Base64._utf8_encode(e); while (f < e.length) { n = e.charCodeAt(f++); r = e.charCodeAt(f++); i = e.charCodeAt(f++); s = n >> 2; o = (n & 3) << 4 | r >> 4; u = (r & 15) << 2 | i >> 6; a = i & 63; if (isNaN(r)) { u = a = 64 } else if (isNaN(i)) { a = 64 } t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a) } return t }, _utf8_encode: function (e) { e = e.replace(/\r\n/g, "\n"); var t = ""; for (var n = 0; n < e.length; n++) { var r = e.charCodeAt(n); if (r < 128) { t += String.fromCharCode(r) } else if (r > 127 && r < 2048) { t += String.fromCharCode(r >> 6 | 192); t += String.fromCharCode(r & 63 | 128) } else { t += String.fromCharCode(r >> 12 | 224); t += String.fromCharCode(r >> 6 & 63 | 128); t += String.fromCharCode(r & 63 | 128) } } return t } } // Creat script for client side printing var rootUrl = $(location).attr('protocol') + "//" + $(location).attr('host'); var ABSOLUTE_URL_TO_PRINT_JOB_CONTROLLER = rootUrl + '/PrintImage/PrintFile'; $.getScript('/WebClientPrintAPI/ProcessRequest?v6.0.0.0&' + new Date().getTime() + '&sid=' + $('#sid').val() + '&u=' + Base64.encode(ABSOLUTE_URL_TO_PRINT_JOB_CONTROLLER)); }); </script> </div> </div> <script> var app = angular.module('myApp', []); app.controller('myCtrl', function($scope) { $scope.sid = new Date().getTime(); }); </script></body></html>

Creating HTTP Handlers

Create a new Generic Handler and name it WebClientPrintAPI and then copy/paste the following code:

public class WebClientPrintAPI : IHttpHandler { //********************************* // IMPORTANT NOTE // In this sample we store users related stuff (like // the list of printers and whether they have the WCPP // client utility installed) in the Application cache // object part of ASP.NET BUT you can change it to // another different storage (like a DB or file server)! // which will be required in Load Balacing scenarios //********************************* public void ProcessRequest (HttpContext context) { //get session ID string sessionID = (context.Request["sid"] != null) ? context.Request["sid"].ToString() : null; //get Query String string queryString = context.Request.Url.Query; try { //Determine and get the Type of Request RequestType prType = WebClientPrint.GetProcessRequestType(queryString); if (prType == RequestType.GenPrintScript || prType == RequestType.GenWcppDetectScript) { //Let WebClientPrint to generate the requested script byte[] script = WebClientPrint.GenerateScript(context.Request.Url.AbsoluteUri.Replace(queryString, ""), queryString); context.Response.ContentType = "text/javascript"; context.Response.BinaryWrite(script); } else if (prType == RequestType.ClientSetWcppVersion) { //This request is a ping from the WCPP utility //so store the session ID indicating this user has the WCPP installed //also store the WCPP Version if available string wcppVersion = context.Request["wcppVer"]; if (string.IsNullOrEmpty(wcppVersion)) wcppVersion = "1.0.0.0"; context.Application.Set(sessionID + "wcppInstalled", wcppVersion); } else if (prType == RequestType.ClientSetInstalledPrinters) { //WCPP Utility is sending the installed printers at client side //so store this info with the specified session ID string printers = context.Request["printers"]; if (string.IsNullOrEmpty(printers) == false) printers = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printers)); context.Application.Set(sessionID + "printers", printers); } else if (prType == RequestType.ClientSetInstalledPrintersInfo) { //WCPP Utility is sending the client installed printers with detailed info //so store this info with the specified session ID //Printers Info is in JSON format string printersInfo = context.Request.Form["printersInfoContent"]; if (string.IsNullOrEmpty(printersInfo) == false) printersInfo = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printersInfo)); context.Application.Set(sessionID + "printersInfo", printersInfo); } else if (prType == RequestType.ClientGetWcppVersion) { //return the WCPP version for the specified Session ID (sid) if any bool sidWcppVersion = (context.Application[sessionID + "wcppInstalled"] != null); context.Response.ContentType = "text/plain"; context.Response.Write(sidWcppVersion ? context.Application[sessionID + "wcppInstalled"] : ""); } else if (prType == RequestType.ClientGetInstalledPrinters) { //return the installed printers for the specified Session ID (sid) if any bool sidHasPrinters = (context.Application[sessionID + "printers"] != null); context.Response.ContentType = "text/plain"; context.Response.Write(sidHasPrinters ? context.Application[sessionID + "printers"] : ""); } else if (prType == RequestType.ClientGetInstalledPrintersInfo) { //return the installed printers with detailed info for the specified Session ID (sid) if any bool sidHasPrinters = (context.Application[sessionID + "printersInfo"] != null); context.Response.ContentType = "text/plain"; context.Response.Write(sidHasPrinters ? context.Application[sessionID + "printersInfo"] : ""); } } catch (Exception ex) { context.Response.StatusCode = 500; context.Response.ContentType = "text/plain"; context.Response.Write(ex.Message + " - " + ex.StackTrace); } } public bool IsReusable { get { return false; } } }

Create a new Generic Handler and name it PrintImageHandler and then copy/paste the following code:

<%@ WebHandler Language="C#" Class="PrintImageHandler" %>using System;using System.Web;using Neodynamic.SDK.Web;public class PrintImageHandler : IHttpHandler { /*############### IMPORTANT!!! ############ If your website requires AUTHENTICATION, then you MUST configure THIS Handler file to be ANONYMOUS access allowed!!! ######################################### */ public void ProcessRequest (HttpContext context) { if (WebClientPrint.ProcessPrintJob(context.Request.Url.Query)) { bool useDefaultPrinter = (Request["useDefaultPrinter"] == "checked"); string printerName = Server.UrlDecode(Request["printerName"]); //full path of the image file to be printed string imgFilePath = @"c:\myImage.jpg"; //create a temp file name for our image file... string fileName = "MyFile-" + Guid.NewGuid().ToString("N") + System.IO.Path.GetExtension(imgFilePath); //Create a PrintFile object with the image file PrintFile file = new PrintFile(imgFilePath, fileName); //Create a ClientPrintJob and send it back to the client! ClientPrintJob cpj = new ClientPrintJob(); //set file to print... cpj.PrintFile = file; //set client printer... if (useDefaultPrinter || printerName == "null") cpj.ClientPrinter = new DefaultPrinter(); else cpj.ClientPrinter = new InstalledPrinter(printerName); //send it... context.Response.ContentType = "application/octet-stream"; context.Response.BinaryWrite(cpj.GetContent()); context.Response.End(); } } public bool IsReusable { get { return false; } }}

Creating/Editing WebForm Pages

Be sure ALL *.aspx link to jQuery 1.4.1+ file!

The default page is for detecting whether the client machine has the WebClientPrint Processor (WCPP) Utility installed. Edit the Default.aspx file and copy/paste the following code inside the BODY:

<div id="msgInProgress"> <div id="mySpinner" style="width:32px;height:32px"></div> <br /> <h3>Detecting WCPP utility at client side...</h3> <h3>Please wait a few seconds...</h3> <br /></div><div id="msgInstallWCPP" style="display:none;"> <h3>#1 Install WebClientPrint Processor (WCPP)!</h3> <p> <strong>WCPP is a native app (without any dependencies!)</strong> that handles all print jobs generated by the <strong>WebClientPrint for ASP.NET component</strong> at the server side. The WCPP is in charge of the whole printing process and can be installed on <strong>Windows, Linux, Mac & Raspberry Pi!</strong> </p> <p> <a href="//www.neodynamic.com/downloads/wcpp/" target="_blank" >Download and Install WCPP from Neodynamic website</a><br /> </p> <h3>#2 After installing WCPP...</h3> <p> <a href="PrintImage.aspx" >You can go and test the printing page...</a> </p></div> <script type="text/javascript"> var wcppPingTimeout_ms = 60000; //60 sec var wcppPingTimeoutStep_ms = 500; //0.5 sec function wcppDetectOnSuccess(){ // WCPP utility is installed at the client side // redirect to WebClientPrint sample page // get WCPP version var wcppVer = arguments[0]; if(wcppVer.substring(0, 1) == "6") window.location.href = 'PrintImage.aspx'; else //force to install WCPP v6.0 wcppDetectOnFailure(); } function wcppDetectOnFailure() { // It seems WCPP is not installed at the client side // ask the user to install it $('#msgInProgress').hide(); $('#msgInstallWCPP').show(); }</script><%-- WCPP detection script code --%><%=Neodynamic.SDK.Web.WebClientPrint.CreateWcppDetectionScript(HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port + "/WebClientPrintAPI.ashx", HttpContext.Current.Session.SessionID)%>

Add a new page and name it PrintImage.aspx. Copy/paste the following code inside the BODY:

<h3>Print image file</h3><div><label class="checkbox"><input type="checkbox" id="useDefaultPrinter" /> <strong>Print to Default printer</strong> or...</label></div><div id="loadPrinters">Click to load and select one of the installed printers!<br /> <input type="button" onclick="javascript:jsWebClientPrint.getPrinters();" value="Load installed printers..." /><br /><br /></div><div id="installedPrinters" style="visibility:hidden"><label for="installedPrinterName">Select an installed Printer:</label><select name="installedPrinterName" id="installedPrinterName"></select></div><script type="text/javascript">var wcppGetPrintersTimeout_ms = 60000; //60 sec var wcppGetPrintersTimeoutStep_ms = 500; //0.5 secfunction wcpGetPrintersOnSuccess() {// Display client installed printersif (arguments[0].length > 0) {var p = arguments[0].split("|");var options = '';for (var i = 0; i < p.length; i++) {options += '<option>' + p[i] + '</option>';}$('#installedPrinters').css('visibility', 'visible');$('#installedPrinterName').html(options);$('#installedPrinterName').focus();$('#loadPrinters').hide();} else {alert("No printers are installed in your system.");}}function wcpGetPrintersOnFailure() {// Do something if printers cannot be got from the clientalert("No printers are installed in your system.");}</script><br /><input type="button" style="font-size:18px" onclick="javascript:jsWebClientPrint.print('useDefaultPrinter=' + $('#useDefaultPrinter').attr('checked') + '&printerName=' + $('#installedPrinterName').val());" value="Print Image..." /><%-- Register the WebClientPrint script code --%><%=Neodynamic.SDK.Web.WebClientPrint.CreateScript(HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port + "/WebClientPrintAPI.ashx", HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port + "/PrintImageHandler.ashx", HttpContext.Current.Session.SessionID)%>

Creating HTTP Handlers

Create a new Generic Handler and name it WebClientPrintAPI and then copy/paste the following code:

<%@ WebHandler Language="VB" Class="WebClientPrintAPI" %>Imports SystemImports System.Web Imports Neodynamic.SDK.Web Public Class WebClientPrintAPI : Implements IHttpHandler '********************************* ' IMPORTANT NOTE ' In this sample we store users related stuff (like ' the list of printers and whether they have the WCPP ' client utility installed) in the Application cache ' object part of ASP.NET BUT you can change it to ' another different storage (like a DB or file server)! ' which will be required in Load Balacing scenarios '********************************* Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest 'get session ID Dim sessionID As String = "" If (context.Request("sid") IsNot Nothing) Then sessionID = context.Request("sid") End If 'get Query String Dim queryString As String = context.Request.Url.Query Try 'Determine and get the Type of Request Dim prType As RequestType = WebClientPrint.GetProcessRequestType(queryString) If prType = RequestType.GenPrintScript OrElse prType = RequestType.GenWcppDetectScript Then 'Let WebClientPrint to generate the requested script Dim script As Byte() = WebClientPrint.GenerateScript(context.Request.Url.AbsoluteUri.Replace(queryString, ""), queryString) context.Response.ContentType = "text/javascript" context.Response.BinaryWrite(script) ElseIf prType = RequestType.ClientSetWcppVersion Then 'This request is a ping from the WCPP utility 'so store the session ID indicating this user has the WCPP installed 'also store the WCPP Version if available Dim wcppVersion As String = context.Request("wcppVer") If String.IsNullOrEmpty(wcppVersion) Then wcppVersion = "1.0.0.0" End If context.Application.Set(sessionID & "wcppInstalled", wcppVersion) ElseIf prType = RequestType.ClientSetInstalledPrinters Then 'WCPP Utility is sending the installed printers at client side 'so store this info with the specified session ID Dim printers As String = context.Request("printers") If Not String.IsNullOrEmpty(printers) Then printers = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printers)) End If context.Application.Set(sessionID & "printers", printers) ElseIf prType = RequestType.ClientSetInstalledPrintersInfo Then 'WCPP Utility is sending the installed printers at client side 'so store this info with the specified session ID 'Printers Info is in JSON format Dim printersInfo As String = context.Request.Form("printersInfoContent") If Not String.IsNullOrEmpty(printersInfo) Then printersInfo = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(printersInfo)) End If context.Application.Set(sessionID & "printersInfo", printersInfo) ElseIf prType = RequestType.ClientGetWcppVersion Then 'return the WCPP version for the specified Session ID (sid) if any Dim sidWcppVersion As Boolean = (context.Application(sessionID & "wcppInstalled") IsNot Nothing) context.Response.ContentType = "text/plain" If (sidWcppVersion) Then context.Response.Write(context.Application(sessionID & "wcppInstalled").ToString()) End If ElseIf prType = RequestType.ClientGetInstalledPrinters Then 'return the installed printers for the specified Session ID (sid) if any Dim sidHasPrinters As Boolean = (context.Application(sessionID & "printers") IsNot Nothing) context.Response.ContentType = "text/plain" If (sidHasPrinters) Then context.Response.Write(context.Application(sessionID & "printers").ToString()) End If ElseIf prType = RequestType.ClientGetInstalledPrintersInfo Then 'return the installed printers with detailed info for the specified Session ID (sid) if any Dim sidHasPrinters As Boolean = (context.Application(sessionID & "printersInfo") IsNot Nothing) context.Response.ContentType = "text/plain" If (sidHasPrinters) Then context.Response.Write(context.Application(sessionID & "printersInfo").ToString()) End If End If Catch ex As Exception context.Response.StatusCode = 500 context.Response.ContentType = "text/plain" context.Response.Write(ex.Message + " - " + ex.StackTrace) End Try End Sub Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable Get Return False End Get End Property End Class

Create a new Generic Handler and name it PrintImageHandler and then copy/paste the following code:

<%@ WebHandler Language="VB" Class="PrintImageHandler" %>Imports SystemImports System.WebImports Neodynamic.SDK.WebPublic Class PrintImageHandler : Implements IHttpHandler '############### IMPORTANT!!! ############ ' If your website requires AUTHENTICATION, then you MUST configure THIS Handler file ' to be ANONYMOUS access allowed!!! '######################################### Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest If WebClientPrint.ProcessPrintJob(context.Request.Url.Query) Then Dim useDefaultPrinter As Boolean = (Request("useDefaultPrinter") = "checked") Dim printerName As String = Server.UrlDecode(Request("printerName")) 'full path of the image file to be printed Dim imgFilePath As String = "c:\myImage.jpg" 'create a temp file name for our image file... Dim fileName As String = "MyFile-" + Guid.NewGuid().ToString("N") + System.IO.Path.GetExtension(imgFilePath) 'Create a PrintFile object with the image file Dim file As New PrintFile(imgFilePath, fileName) 'Create a ClientPrintJob and send it back to the client! Dim cpj As New ClientPrintJob() 'set file to print... cpj.PrintFile = file Dim cpj As New ClientPrintJob() cpj.PrintFile = file If useDefaultPrinter OrElse printerName = "null" Then cpj.ClientPrinter = New DefaultPrinter() Else cpj.ClientPrinter = New InstalledPrinter(printerName) End If context.Response.ContentType = "application/octet-stream" context.Response.BinaryWrite(cpj.GetContent()) context.Response.End() End If End Sub Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable Get Return False End Get End PropertyEnd Class

Creating/Editing WebForm Pages

Be sure ALL *.aspx link to jQuery 1.4.1+ file!

The default page is for detecting whether the client machine has the WebClientPrint Processor (WCPP) Utility installed. Edit the Default.aspx file and copy/paste the following code inside the BODY:

<div id="msgInProgress"> <div id="mySpinner" style="width:32px;height:32px"></div> <br /> <h3>Detecting WCPP utility at client side...</h3> <h3>Please wait a few seconds...</h3> <br /></div><div id="msgInstallWCPP" style="display:none;"> <h3>#1 Install WebClientPrint Processor (WCPP)!</h3> <p> <strong>WCPP is a native app (without any dependencies!)</strong> that handles all print jobs generated by the <strong>WebClientPrint for ASP.NET component</strong> at the server side. The WCPP is in charge of the whole printing process and can be installed on <strong>Windows, Linux, Mac & Raspberry Pi!</strong> </p> <p> <a href="//www.neodynamic.com/downloads/wcpp/" target="_blank" >Download and Install WCPP from Neodynamic website</a><br /> </p> <h3>#2 After installing WCPP...</h3> <p> <a href="PrintImage.aspx" >You can go and test the printing page...</a> </p></div> <script type="text/javascript"> var wcppPingTimeout_ms = 60000; //60 sec var wcppPingTimeoutStep_ms = 500; //0.5 sec function wcppDetectOnSuccess(){ // WCPP utility is installed at the client side // redirect to WebClientPrint sample page // get WCPP version var wcppVer = arguments[0]; if(wcppVer.substring(0, 1) == "6") window.location.href = 'PrintImage.aspx'; else //force to install WCPP v6.0 wcppDetectOnFailure(); } function wcppDetectOnFailure() { // It seems WCPP is not installed at the client side // ask the user to install it $('#msgInProgress').hide(); $('#msgInstallWCPP').show(); }</script><%-- WCPP detection script code --%><%=Neodynamic.SDK.Web.WebClientPrint.CreateWcppDetectionScript(HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port + "/WebClientPrintAPI.ashx", HttpContext.Current.Session.SessionID)%>

Add a new page and name it PrintImage.aspx. Copy/paste the following code inside the BODY:

<h3>Print image file</h3><div><label class="checkbox"><input type="checkbox" id="useDefaultPrinter" /> <strong>Print to Default printer</strong> or...</label></div><div id="loadPrinters">Click to load and select one of the installed printers!<br /> <input type="button" onclick="javascript:jsWebClientPrint.getPrinters();" value="Load installed printers..." /><br /><br /></div><div id="installedPrinters" style="visibility:hidden"><label for="installedPrinterName">Select an installed Printer:</label><select name="installedPrinterName" id="installedPrinterName"></select></div><script type="text/javascript">var wcppGetPrintersTimeout_ms = 60000; //60 sec var wcppGetPrintersTimeoutStep_ms = 500; //0.5 secfunction wcpGetPrintersOnSuccess() {// Display client installed printersif (arguments[0].length > 0) {var p = arguments[0].split("|");var options = '';for (var i = 0; i < p.length; i++) {options += '<option>' + p[i] + '</option>';}$('#installedPrinters').css('visibility', 'visible');$('#installedPrinterName').html(options);$('#installedPrinterName').focus();$('#loadPrinters').hide();} else {alert("No printers are installed in your system.");}}function wcpGetPrintersOnFailure() {// Do something if printers cannot be got from the clientalert("No printers are installed in your system.");}</script><br /><input type="button" style="font-size:18px" onclick="javascript:jsWebClientPrint.print('useDefaultPrinter=' + $('#useDefaultPrinter').attr('checked') + '&printerName=' + $('#installedPrinterName').val());" value="Print Image..." /><%-- Register the WebClientPrint script code --%><%=Neodynamic.SDK.Web.WebClientPrint.CreateScript(HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port + "/WebClientPrintAPI.ashx", HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port + "/PrintImageHandler.ashx", HttpContext.Current.Session.SessionID)%>