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POCapture screenshot of OpenGL/Direct3D 3rd party application
 

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    <p>I want to capture the contents (client area) of a window, in my VS2008, MFC, C++ project. I have tried using the PrintWindow technique described here: <a href="https://stackoverflow.com/questions/7292757/how-to-get-screenshot-of-a-window-as-bitmap-object-in-c">How to get screenshot of a window as bitmap object in C++?</a></p> <p>I have also tried blitting the contents of the window using the following code:</p> <pre><code>void captureWindow(int winId) { HDC handle(::GetDC(HWND(winId))); CDC sourceContext; CBitmap bm; CDC destContext; if( !sourceContext.Attach(handle) ) { printf("Failed to attach to window\n"); goto cleanup; } RECT winRect; sourceContext.GetWindow()-&gt;GetWindowRect(&amp;winRect); int width = winRect.right-winRect.left; int height = winRect.bottom-winRect.top; destContext.CreateCompatibleDC( &amp;sourceContext ); if(!bm.CreateCompatibleBitmap(&amp;sourceContext, width, height)) { printf("Failed to create bm\n"); goto cleanup; } { //show a message in the window to enable us to visually confirm we got the right window CRect rcText( 0, 0, 0 ,0 ); CPen pen(PS_SOLID, 5, 0x00ffff); sourceContext.SelectObject(&amp;pen); const char *msg = "Window Captured!"; sourceContext.DrawText( msg, &amp;rcText, DT_CALCRECT ); sourceContext.DrawText( msg, &amp;rcText, DT_CENTER ); HGDIOBJ hOldDest = destContext.SelectObject(bm); if( hOldDest==NULL ) { printf("SelectObject failed with error %d\n", GetLastError()); goto cleanup; } if ( !destContext.BitBlt( 0, 0, width, height, &amp;sourceContext, 0, 0, SRCCOPY ) ){ printf("Failed to blit\n"); goto cleanup; } //assume this function saves the bitmap to a file saveImage(bm, "capture.bmp"); destContext.SelectObject(hOldDest); } cleanup: destContext.DeleteDC(); sourceContext.Detach(); ::ReleaseDC(0, handle); } </code></pre> <p>The code works fine for most applications. The specific application where I need to capture the screenshot however, has a window that I think is rendered using OpenGl or Direct3D. Both methods will capture most of the app just fine, but the "3d" area will be left black or garbled.</p> <p>I do not have access to the application code, so I cannot change it in any way. </p> <p>Is there any way to capture all the contents, including the "3d" window?</p>
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    1. COLooking at the same problem myself. Please post solution, if you did find one.
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    2. COUnfortunately I still haven't been able to solve this. It stays as a bug in our system :-(
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