trying to display UI in C++ DLL from VB6 causes assert at AfxGetResourceHandle

Question

I have a legacy vb6 code that calls into c++ to display MFC dialog. Calling AfxGetResourceHandle to load the dll's resource onto the memory causes debug assert. Has anyone done this?

    HINSTANCE priorRes = AfxGetResourceHandle();

    if (m_MDCommonDll == NULL)
    {
        m_MDCommonDll = LoadLibrary("MyDll.dll");
    }

    AfxSetResourceHandle(m_MDCommonDll);

If this is not possible to do, is there a way to detect if the caller is from vb6 so that I can skip showing the UI?

Thanks

Did you use AFX_MANAGE_STATE(AfxGetStaticModuleState());? check http://stackoverflow.com/questions/9062034/what-does-afx-manage-stateafxgetstaticmodulestate-do-exactly — Sheng Jiang 蒋晟, Jul 12 '12 at 22:54
thanks that fixed the issue. Do you know what is the difference between AfxSetResourceHandle and AFX_MANAGE_STATE are? From MSDN description, they sound pretty similar — user156144, Jul 12 '12 at 23:13
resource handle is just one of the state that needs to be switched when entering a MFC regular DLL. — Sheng Jiang 蒋晟, Jul 13 '12 at 00:00

score 1 · Answer 1 · answered Aug 16 '12 at 08:49

1

AfxGetResourceHandle( ) can throw a debug assert if you mix release and debug build DLLs. Make sure your .exe and any .dlls it loads are all built as either release or debug.

answered Aug 16 '12 at 08:49

osullivj

341
1
5

trying to display UI in C++ DLL from VB6 causes assert at AfxGetResourceHandle

1 Answers1