[Qt-interest] Regarding Mfc to Qt migration

elizabeta petreska elizabeta.petreska at gmail.com
Wed Nov 4 14:44:46 CET 2009


Hello

I am using the Mfc to Qt migration solution, to migrate my Mfc plugin to Qt.
My Mfc plugin is loaded in third party Mfc app. Basically I am using the
following example
http://doc.trolltech.com/solutions/4/qtwinmigrate/winmigrate-qt-dll-example.html
<http://doc.trolltech.com/solutions/4/qtwinmigrate/winmigrate-qt-dll-example.html%20>

As you may notice , pluginInstance is called in the DllMain function.
I read the code od pluginInstance, and it looks like this :

bool QMfcApp::pluginInstance(Qt::HANDLE plugin)
{
    if (qApp)
    return FALSE;

    QT_WA({
    hhook = SetWindowsHookExW(WH_GETMESSAGE, QtFilterProc, 0,
GetCurrentThreadId());
    }, {
    hhook = SetWindowsHookExA(WH_GETMESSAGE, QtFilterProc, 0,
GetCurrentThreadId());
    });

    int argc = 0;
    (void)new QApplication(argc, 0);

    if (plugin) {
    char filename[256];
    if (GetModuleFileNameA((HINSTANCE)plugin, filename, 255))
        LoadLibraryA(filename);
    }

    return TRUE;
}

As you may notice , pluginInstance calls LoadLibrary.

 Everything is working ok , so far . But I have the following concern :
The pluginInstance function is called inside DllMain. And pluginInstance is
calling LoadLibrary.
Somewhere I read that is WRONG and forbidden  to call LoadLibrary in
DllMain.
So my question is it safe to call pluginInstance in DllMain ?
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