CFileDialog causes application to Hang on Windows 2000

I have developed an application using VC 7.1.
In this application a call to CFileDialog::DoModal() causes the application
to hang and never return.
It happens on random machines. I have tested it on different machines and it
doesn't hang on some of the machines but it hangs on others.

After debugging I've found that the application hangs on a call to
GetSaveFileName() function within the DoModal function.

What is the reason for it and whats the work around?

Thanks,
Faisal

You may need to provide more info, context of how the code is called, what 
parameters you pass in, where the dialog is set to initialise to exactly 
(full path) is it network or local, does it repro if you adjust any of the 
aformentioned parameters.

Andy Mortimer [MS]
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newsgroup purposes only

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While running have you checked the value of sizeof(OPENFILENAMEW)...?  What
was the result?

    Rail
-- 
      Recording Engineer/Software Developer
      Rail Jon Rogut Software
       http://www.**--****.com/ 
      mailto: XXXX@XXXXX.COM 

This is how I am using it
CFileDialog fileDialog(FALSE, _T("csv"), NULL,
OFN_OVERWRITEPROMPT|OFN_PATHMUSTEXIST, NULL, this, sizeof(OPENFILENAME));

if (fileDialog.DoModal() ==IDOK )

{

UpdateData(TRUE);

m_strOutputFileName = fileDialog.GetPathName();

UpdateData(FALSE);

}



I also tried by providing NULL in place of sizeof (OPENFILENAME), but it
still hangs.

Please help.

Thanks,

Faisal





rights.

Have you checked the versions of comctl32.dll on your problematic PC's?

Andy Mortimer [MS]
Please do not send email directly to this alias. This alias is for 
newsgroup purposes only

This posting is provided "AS IS" with no warranties, and confers no rights. 
OR if you wish to include a script sample in your post please add "Use of 
included script samples are subject to the terms specified at 
 http://www.**--****.com/ " 

Following is the version info for comctl32.dll on probelmatic PC:

File Version: 5.81.4916.400
Product Version: 5.50.4916.400

Please suggest, my client needs the 'Browse' button to work on his system :)

You might want to try adjusting the value of  _WIN32_WINNT inside stdafx.h 
to see if that has any effect.

Andy Mortimer [MS]
Please do not send email directly to this alias. This alias is for 
newsgroup purposes only

I tried adjusting that too. The default value I believe is 0x0500, which I 
believe is for windows 2000, I changed to 0x0400 but the application still 
hangs, also tried with 0x0600, but then I started having compile time errors, 
like:

C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin.h(3289): error C2061: syntax error : 
identifier 'PSCROLLBARINFO'
C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin4.inl(148): error C2065: 'PSCROLLBARINFO' : 
undeclared identifier
C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin4.inl(148): error C2146: syntax error : missing 
')' before identifier 'pScrollInfo'
C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin4.inl(148): error C2761: 'BOOL 
CScrollBar::GetScrollBarInfo(void) const' : member function redeclaration not 
allowed
C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin4.inl(148): error C2059: syntax error : ')'
C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin4.inl(149): error C2143: syntax error : missing 
';' before '{'
C:\Program Files\Microsoft Visual Studio .NET 
2003\Vc7\atlmfc\include\afxwin4.inl(149): error C2447: '{' : missing function 
header (old-style formal list?)

Can you guide me here?

I think ( I am not sure ) this occurs only with Windows 2000 and IE6 
combination. Would it help in identifying the problem?

Thanks,
Faisal

What is it about the PC's that fail? Do the folders contain lots of files, 
or files which are huge, long filenames etc? Perhaps do some analysis into 
what is different in working and non working scenarios. Also, you could use 
filemon utility from sysinternals.com to see if files are actually being 
accessed. Also can review 
 http://www.**--****.com/ ;EN-US;Q286350 in order to 
use adplus to create a hang dump of the problem and analyse the stacks.

Finally, I managed to fix this bug...well not completely but it is now working.

The reason being for not working on some of the windows 2000 machines was: 
That I was giving 'null' for the lpszFilter parameter. That should mean there 
is no filter. But this gives trouble with some of the Windows 2000 machines.

Again, if I give some filter, other than '*.*', it still gives trouble. 

So, During Hit and Trial, I found that it works well on all the windows 2000 
machines only if I give a single filter of *.*

Do you have any idea about the issue? Is this a known issue or what? Is 
there a work around?

Thanks,
Faisal

Remember that the filter string should be double zero-terminated.

Indeed. Note the remarks section:-

Remarks
The lpszFilter parameter is used to determine the type of filename a file 
must have to be displayed in the file list box. The first string in the 
string pair describes the filter; the second string indicates the file 
extension to use. Multiple extensions may be specified using a semicolon 
(;) as the delimiter. The string ends with two vertical bar (||) 
characters, followed by a NULL character. You can also use a CString object 
for this parameter.

For example, Microsoft Excel permits users to open files with extensions 
.XLC (chart) or .XLS (worksheet), among others. The filter for Excel could 
be written as:

static char BASED_CODE szFilter[] = "Chart Files (*.xlc)|*.xlc|Worksheet 
Files (*.xls)|*.xls|Data Files (*.xlc;*.xls)|*.xlc; *.xls|All Files 
(*.*)|*.*||";
Note, however, that if you plan to use this string to directly update the 
OPENFILENAME structure, you should delimit your strings with the null 
character, (\0), instead of the vertical bar (|).