Re: Odd behavior/Hang with CFileDialog in vista.
Thanks,
Feel silly for not reading up on the flags, but not the usual area of code
I work in so didn't even think of that.
I do think it is possible there is some issue/bug with the underlying
windows code, but using the flag solves my problem so I'm not going to
investigate further.
Thanks again.
"Doug Harrison [MVP]" wrote:
On Thu, 23 Jul 2009 14:53:01 -0700, James B.
<JamesB@discussions.microsoft.com> wrote:
I have a bug I'm tracking down that only occurs in vista.
The behavior is slightly different on Vista 64 and Vista 32.
The code instantiates a CFileDialog object via CFileDialog openDlg(...)
We initialize the dialog then use roughly the following loop
do
{ // Repeat until user either cancels or chooses an existing file
bResult = false;
if (openDlg.DoModal() == IDOK)
{ // User has selected a file and pressed OK
outSelectedFile->Assign(openDlg.GetPathName(), NULL); // get the file name
bResult = true;
}
}
while (bResult && !outSelectedFile->OSIsFileExists());
Can't you use the OFN_FILEMUSTEXIST flag to disallow non-existing files?
Now the bug comes when the user types random letters(or anything that isn't
an actual file in the directory). Then hits OK
On XP, things work fine, we will find that we don't have a real file name so
go back and hit DoModal() again till we do have a valid file or they hit
cancel.
On Vista 64, debug mode asserts inside dlgfile.cpp
hr = (static_cast<IFileDialog*>(m_pIFileDialog))->SetFileTypes(nFilterCount,
pFilter);
can continue from this assert and will get a dialog up saying params invalid
(CFileDialog has goneaway)
Release mode no assert, just dialog.
But on Vista 32 we hang and eventually system asks if we want to close a non
responding app.
I could turn off vista dialog type but hate to do this.
It seems doModal is having issues setting up stuff on vista the second time
through.
One option I suppose would be to have *Dialog = new CFileDialog (...)
instead of having a local version, and delete and create it each time through
but this seems heavy handed.
There's no need to use new. Just declare openDlg inside your loop as an
ordinary local variable.
Is it ok/correct to have this kind of a loop and recall DoModal on the
CFileDialog?
Apparently not. :) You'd have to trace through SetFileTypes and maybe
examine all the input to the Windows API to determine what's going wrong.
--
Doug Harrison
Visual C++ MVP
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