CFileDialog freezes when launched from Modeless Dialog - c++

Question

I'm attempting to call CFileDialog to allow the user to select a file.
My program is a MFC application and I am using VS2005.
Here is my problem:
I have main View that creates a modeless dialog box. In this dialog box I have a menu item that makes a simple CFileDialog call:
CFileDialog dlgFile(true);
dlgFile.DoModal();
But the program always hangs on the DoModal. The program does not respond to commands and Task manager says it has stopped responding.
Other interesting pieces of information:
This has only been observed on Windows 8, Windows 7 machines seem to be unaffected.
I created a new project with the same basic View->modeless dialog->CFileDialog scheme and it worked just fine.
When I make a call to MessageBox, it appears behind the dialog box (I have to hit alt to get it up front), but the program is still responsive.
If I make the same CFileDialog call in the main View, it pops up without any problem.
Another annoying issue that may or may not be related to this: When the CFileDialog call is working (on Win 7), selecting "computer" in the browse window shows a blank white screen (Everything else works fine).
The closest questions I could find is this: Why does CFileDialog::DoModal() Hang?
However, I don't use threads (At least I'm 95% sure I don't, this isn't just my project). Is my project automatically being threaded? If so, how can I make sure that isn't causing me problems?

Answer 1

I've the same problem in VS2008.
Try to set to false the last parameter in CFileDialog constructor (bVistaStyle)

Answer 2

dlgFile.DoModal() calls run modal routine, it enables/disables and refocus windows, maybe that's the problem. You can try GetOpenFileName instead:
void CModeless::foo()
{
//EnableWindow(0);
OPENFILENAME ofn = { 0 };
char buf[300];
memset(buf, 0, 300);
ofn.lpstrFile = buf;
ofn.nMaxFile = 300;
ofn.lStructSize = sizeof(OPENFILENAME);
//ofn.hwndOwner = AfxGetApp()->m_pMainWnd->m_hWnd;
GetOpenFileName(&ofn);
//EnableWindow(1);
}
If there is no bug, then uncomment EnableWindow and ofn.hwndOwner, try again. You can also try this method:
void CModeless::foo()
{
CWnd *wnd = GetParent(); //or AfxGetApp()->m_pMainWnd
EnableWindow(0);
CFileDialog dlg(TRUE, 0, 0, 0, 0, wnd, 0, 1);
dlg.DoModal();
EnableWindow(1);
MSG msg;
while (::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
if (!AfxGetApp()->PumpMessage())
break;
SetFocus();
}

Answer 3

My CDialogEx based dialog was unable to show the CFileDialog. From within my CDocument, everything worked fine.
I found, that my dialog had a custom control, that was derived from CStatic and overrode the virtual WindowProc( ).
After commenting the WindowProc, the CFileDialog showed as usual.
The issue is only for the "m_bVistaStyle" CFileDialog, and the freeze occours in IFileDialog->Show().