[Qt-interest] Regarding Mfc to Qt migration

[elizabeta petreska]

Also I read that calling SetWindowsHook form DllMain is unsafe
Actually DllMain is only for simple initialization.



On Wed, Nov 4, 2009 at 2:44 PM, elizabeta petreska <
elizabeta.petreska at gmail.com> wrote:

> 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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