Exception when closing QMainWindow (MFC CWinApp)

Perdrix

This is happening as the QMainWindow instance is being destroyed

The error is happening at wincore.cpp line 1078 which reads:

ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);

I tried adding a PostNcDestroy to the CDialog that is part of the QMainWindow subclass:

void MyDialog::PostNcDestroy()
{

CDialog::PostNcDestroy();
delete this;

}

but that didn't help :(

Perdrix

I managed to fix this issue. As the processingDlg CDialog isn't a child of a CFrameWindow (e.g.), it isn't automatically destroyed (WM_DESTROY) when the QMainWindow is closed.

I added a call to the QMainWIndow CloseEvent handler saying:

	processingDlg.DestroyWindow();

and all is now well :) :)