From Ralf Habacker, "the appended patch fixes the problem reported on http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2008-January/006110.html. "

> Using QOSGWidget - QWidget + osgViewer creating the graphics context.
>
> Windows Error #2000: [Screen #0] GraphicsWindowWin32::setWindow() - Unable
> to create OpenGL rendering context. Reason: The pixel format is invalid.
>
>
>
> And then the following fate error pops up:
>
>
>
> The instruction at "0x014c7ef1" referenced memory at "0x000000a4", The
> memory could not be "read".
>
> Click on Ok to terminate the program
>
> Click on CANCEL to debug the program
>
>

src/osgViewer/GraphicsWindowWin32.cpp

@@ -1140,7 +1140,13 @@ bool GraphicsWindowWin32::setWindow( HWND handle )
         //
         // Create the OpenGL rendering context associated with this window
         //
-
+        if (!setPixelFormat())
+        {
+            reportErrorForScreen("GraphicsWindowWin32::setWindow() - Unable to set the inherited window pixel format", _traits->screenNum, ::GetLastError());
+            _hdc  = 0;
+            _hwnd = 0;
+            return false;
+        }
         _hglrc = ::wglCreateContext(_hdc);
         if (_hglrc==0)
         {