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Windows CE: Assertion failed in wincore.cpp line 1034

For home automation, I grabbed my old PDA and started coding for it, using the Microsoft embedded Visual C++ Studio 3.0 (was free at that time ;-))

As soon as you start debugging, you immediatly get an assert: "Assertion failed in file wincore.cpp, line 1034". This only happens on the "emulated" PDA, but even with the wizard generated files.

However, I solved this already on another project, but I needed to google it up again, so its time to document this:

• In your project, open the Class Wizard (in the View menu)
• Select your App-Class
• Add the Message Handler "PreTranslateMessage"
• Double click on the now listed member function
• Make the member function look this like, adding the bold lines:

BOOL <your-app-name>App::PreTranslateMessage(MSG* pMsg)
{
#ifdef _WIN32_WCE_EMULATION
    if( ! ::IsWindow(pMsg->hwnd))
        return TRUE;
#endif
   
    return CWinApp::PreTranslateMessage(pMsg);
}