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wrong comctl32.dll version

I have an MFC dinamically linked application and it works fine on some computers (not installed with Visual C++ 5) but in one I got an assertion from a dlgdrop.cpp file which called a function in comctl32.dll. But I can't replace the .dll because its being used by windows. Is there a way to tell my application to look for the .dll not in the system directory but somewhere I'll put it in ?
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oragon
Asked:
oragon
1 Solution
 
plarocheCommented:
I don't understand why you can't replace it. Go to microsoft's web site and download the latest common control update, it comes with its own installer and will update it for you.

If not then place the most recent version of the dll in the same directory as your application. It MIGHT work. But as you know, when a DLL is already loaded in memory it will only be mapped to your process, not reloaded. Chances are that this dll is loaded anytime an application starts, even if no application is running windows itself uses it.
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rascalCommented:
You should check the version of the dll and notify the user that they need to upgrade the dll. To check the version in your app:

// in your .h file:

// To determine version of ComCtl32
enum COMCTL32VERSION
{
    COMCTL32_UNKNOWN,COMCTL32_400,COMCTL32_470,COMCTL32_471
};
    static COMCTL32VERSION c_nComCtl32Version;
    static COMCTL32VERSION ComCtl32Version();

// in your .cpp file:
//*************************************************************************
// ComCtl32Version
//*************************************************************************
COMCTL32VERSION CStatusViewerApp::c_nComCtl32Version = COMCTL32_UNKNOWN;

COMCTL32VERSION CStatusViewerApp::ComCtl32Version() {
    // if we don't already know which version, try to find out
    if (c_nComCtl32Version == COMCTL32_UNKNOWN) {
        // have we loaded COMCTL32 yet?
        HMODULE theModule = ::GetModuleHandle(_T("COMCTL32"));
        // if so, then we can check for the version
        if (theModule) {
            // InitCommonControlsEx is unique to 4.7 and later
            FARPROC theProc = ::GetProcAddress(theModule, "InitCommonControlsEx");
            if (! theProc) {
                // not found, must be 4.00
                c_nComCtl32Version = COMCTL32_400;
                } else {
                // The following symbol are unique to 4.71
                //   DllInstall
                //   FlatSB_EnableScrollBar FlatSB_GetScrollInfo FlatSB_GetScrollPos
                //   FlatSB_GetScrollProp FlatSB_GetScrollRange FlatSB_SetScrollInfo
                //   FlatSB_SetScrollPos FlatSB_SetScrollProp FlatSB_SetScrollRange
                //   FlatSB_ShowScrollBar
                //   _DrawIndirectImageList _DuplicateImageList
                //   InitializeFlatSB
                //   UninitializeFlatSB
                // we could check for any of these - I chose DllInstall
                FARPROC theProc = ::GetProcAddress(theModule, "DllInstall");
                if (! theProc) {
                    // not found, must be 4.70
                    c_nComCtl32Version = COMCTL32_470;
                } else {
                    // found, must be 4.71
                    c_nComCtl32Version = COMCTL32_471;
                    }
                }
            }
        }
    return c_nComCtl32Version;
}

// Finally, call the function and check version
    // Make sure the proper dll version is in place
    if (ComCtl32Version() < COMCTL32_470)
    {
        << issue message to user >>
    }



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oragonAuthor Commented:
I used LoadLibrary to force my application to user what looked like a better version of the comctl32.dll, and then I got an ASSERTION in tooltip.cpp line 383, but I looked at that line and found no ASSERT code there. There seems to be a mix-up in versions here, and I'm pretty lost. Also - In a tree control my application uses Images didn't appear (but I took the comctl32.dll file which on another computer seems to work fine).
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