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    <p>Marc Durdin has an excelent blog post with a detailed example in Delphi. It's easily portable to C++ and other languages:</p> <blockquote> <p><a href="http://marc.durdin.net/2011/07/demystifying-printing-with-microsoft.html" rel="nofollow">Demystifying printing with the Microsoft WebBrowser control and ShowHTMLDialogEx</a></p> </blockquote> <p>In particular, <a href="http://msdn.microsoft.com/en-us/library/aa753352.aspx" rel="nofollow"><code>__IE_PrinterCmd_DevMode</code></a> should be an unlocked <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751.aspx" rel="nofollow"><code>HGLOBAL</code></a> (typically a valid return value from <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa366574.aspx" rel="nofollow"><code>GlobalAlloc</code></a> or <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa366590.aspx" rel="nofollow"><code>GlobalReAlloc</code></a>). This is not documented anywhere, I guess Marc discovered the hard way by trial and error, finally finding it working with the values in the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms646843.aspx" rel="nofollow"><code>PRINTDLG.hDevMode</code> and <code>PRINTDLG.hDevNames</code></a> fields, as directly provided by a call to <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms646940.aspx" rel="nofollow"><code>PrintDlg</code></a>.</p> <p>I've been able to pass <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751.aspx" rel="nofollow"><code>HGLOBAL</code></a>s as integers to a template's script and use them to initialize <a href="http://msdn.microsoft.com/en-us/library/aa753352.aspx" rel="nofollow"><code>__IE_PrinterCmd_DevMode</code></a> and <a href="http://msdn.microsoft.com/en-us/library/aa753353.aspx" rel="nofollow"><code>__IE_PrinterCmd_DevNames</code></a>, before creating a <a href="http://msdn.microsoft.com/en-us/library/aa969431.aspx" rel="nofollow"><code>TemplatePrinter</code></a>. This is handy if you don't want to call <a href="http://msdn.microsoft.com/en-us/library/aa741859.aspx" rel="nofollow"><code>ShowHTMLDialogEx</code></a> yourself and you already have a hook into your application. I'm using the original window's <code>external</code> scripting object. To access it from the template, I use:</p> <pre><code>dialogArguments.__IE_BrowseDocument.parentWindow.external </code></pre> <blockquote> <p>PS: Passing an <code>HGLOBAL</code> as an integer works on a 32-bit process, because JScript's numbers are actually double floats, which can represent sequential integers up to 53-bit. But due to this limitation, passing an <code>HGLOBAL</code> as an integer on a 64-bit process is not reliable.</p> <p>Maybe you can make your <code>window.external</code> object have a method, which expects a print template's <code>dialogArguments</code> object, that sets the <code>__IE_PrinterCmd_DevMode</code> and <code>__IE_PrinterCmd_DevNames</code> with integer <code>VARIANT</code>s (<code>VT_I8</code> or <code>VT_UI8</code>).</p> <p>I haven't tested this yet.</p> </blockquote> <p>If you just want to select a printer other than the system default, you may just as well set the <a href="http://msdn.microsoft.com/en-us/library/aa753351.aspx" rel="nofollow"><code>__IE_PrinterCMD_Printer</code></a> property. You can do it in JScript, it'll affect the <a href="http://msdn.microsoft.com/en-us/library/aa969431.aspx" rel="nofollow"><code>TemplatePrinter</code></a> behavior objects that you create after setting it. However, with this property alone, you cannot control the initial settings or know which printer the user finally chose.</p>
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    1. POHow to set __IE_PrinterCmd_DevMode Property to a DEVMODE structure in print template in IE with Visual C++
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