CFileDialog::DoModal() blocks in Release configuration

wschalch · #1 20-Jul-2004, 13:31

Hello Everybody,

I have a MFC application that uses the CFileDialog class to use an Open File window.

The code I am using is the following:

CPP / C++ / C Code:

	CFileDialog fileDialog( TRUE, L"txt", L"*.txt", OFN_FILEMUSTEXIST | OFN_LONGNAMES | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_NOCHANGEDIR | OFN_NONETWORKBUTTON | OFN_EXPLORER, L"Text Files", this );

	int ret = fileDialog.DoModal();
	if( ret == IDOK )
	{
		m_File = fileDialog.GetPathName();

		UpdateData( FALSE );
	}

When I compile in Debug configuration everything works just fine, but in Release configuration the following happens:

1º) When I run from inside the Visual C++, it works;
2º) When I run directly from the EXE file, it blocks in the DoModal() call of the CFileDialog object;
3º) If I use the old-style file dialog box, it works just fine.

Does anyone know what migth be wrong?

Thanks,
Wagner

SpaceDudeAlien · #2 22-Oct-2004, 08:07

Hi WSCHALCH,

I recently ran into excactly the same issue with the CFileDialog: At a customer site (of course, it couldn't happen in our lab) the application would freeze whenever somebody opened the File Save-As dialog.

After searching the web for answers, I came across a posting which I found very helpful (it's at the end of this posting).
Basically, if you have IE 6 installed and initialize the COM Apartment as multi-threaded, you may (or may not) run into troubles with the CFileDialog class (or the ::GetSaveFileName WIN32 function - it's really the same thing).
Based on that information I changed the threading model to Single Threaded and the application works beautifully ever since!

One thing though: There may be situations where IE 6 does not cause the above situation, i.e. my development PC, running Win2k Pro and IE 6. In difference to the customer site my OS has all SPs and Hotfixes loaded - and it's very likely that one of them fixed the IE 6 COM issue.

And here's the promised link:
www.codeguru.com

Have fun!

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CFileDialog::DoModal() blocks in Release configuration

IE 6 COM Apartment Threading Model may be the issue