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POModal dialogs opened by a fullscreen OpenGL window on Windows 7 are not showing
 

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    <p>It seems that my problem may be the same as an unanswered related question (<a href="https://stackoverflow.com/questions/1842312/opengl-with-glut-on-windows-7-fullscreen-mode-not-showing-the-message-box">OpenGL with GLUT on windows 7, fullscreen mode not showing the message box</a>).</p> <p>Since I switched to Win7 as a development environment, and a possible target platform for my applications, I noticed a regression in their behaviour.</p> <p>Whenever I have a fullscreen window containing a fullscreen OpenGL context, the applications have problems displaying modal dialog boxes (such as message boxes, file open dialog, etc.)</p> <p>The window is just created with WS_POPUP style. The GL context is nothing fancy. And everything is fine with Windows XP.</p> <p>The problem under Windows 7 is that the modal dialog boxes are invisible at their opening (maybe their appear behind the full screen window). You have to Alt-Tab the application to have the dialogs appear.</p> <p>This is a major problem as the application appears to be frozen, while it in fact waits for user input.</p> <p>Did anyone encounter this behaviour ? Does anyone know a workaround ?</p> <p>I've quickly made up a sample test application ; its source code can be found at <a href="http://pastebin.com/K4v2NNDs" rel="nofollow noreferrer">http://pastebin.com/K4v2NNDs</a>. A simple MSVC8 project can be found <a href="http://code.google.com/p/rotoglup-scratchpad/source/browse/#svn/trunk/misc/windows7_fullscreen_modal_dialog_pb" rel="nofollow noreferrer">here</a>.</p> <p>PS. I've also posted on opengl.org forums, sorry for those of you that follow both.</p> <p><strong>EDIT</strong></p> <p>Thanks to Chris comment, I've tested the modal dialog on various events, such as WM_TIMER or WM_RBUTTONUP, but the problem is still there.</p> <p>I've also called 'DwmEnableComposition' with 'DWM_EC_DISABLECOMPOSITION' just to check : problem still there.</p> <p>I've also tested the application by replacing the OpenGL bits by DirectX, and this way everything works as expected... It's really OpenGL causing the problem.</p> <p>(updated pastebin <a href="http://pastebin.com/Rq1Ehm3w" rel="nofollow noreferrer">http://pastebin.com/Rq1Ehm3w</a> and my scratchpad)</p> <p><strong>EDIT</strong></p> <p>The problem also exists on Windows 8.</p>
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    1. COAnd when the dialog is created modeless? you are creating it during the processing of a keystroke, so the focus and activation states are somewhat in flux.
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    2. COChris, thanks for your suggestion, but I'm no Win32 expert, I don't know off-hand how to create a modeless dialog...
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