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I don't get you. I mean, the user once the file dialog is open, chooses both the folder and the file extension (by choosing an allowed file). What do you want to do, instead?
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I want that automatically when I change the extension of the files I want to see, the dialog automatically also change the folder of the list of files. The '.txt' files are in one folder, the '.doc' files in another ...
I Try, but I'm not sure  )
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Ok but... How do you change the extension of the files you wanto to see?
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in the Combo box that appared in CFileDialog when I configure more extension, I intercept the OnTypeChange() and in this routine I want change the dir...
I Try, but I'm not sure )
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sorry... in expert-exchange :
"You can use the DlgDirList() function (of CWnd class). It fills a list box with a file or directory listing. Only thing you should know is the ID of the list control."
and I haven't the ID of the list control 
I Try, but I'm not sure )
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I think the more promising approach shown in the linked page is writing the address of folder in the edit box and then (programmatically) clicking the OK button (check out the final comments).
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Thank's Richard, I have see the class...
I have that routine and in that routine I want change the dir.
Different dir for different extension.
I Try, but I'm not sure )
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Then you need to handle the notification message, as documented in that link.
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Thank's Richard,
I'm using VC6++ and I need a simple example to understand..
my OnTypeChange()
{
if(m_ofn.nFilterIndex==1)
m_ofn.lpstrDefExt=".txt";
if(m_ofn.nFilterIndex==2)
m_ofn.lpstrDefExt=".doc";
if(m_ofn.nFilterIndex==1)
...code for change dir1
if(m_ofn.nFilterIndex==2)
...code for change dir2
}
I Try, but I'm not sure )
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You need to check which property or method controls the current directory, and add code to manage it. Again the documentation will give you the information.
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I don't use MFC but as it shims the Win32 I will explain how you do it in raw Win32.
The FILEOPEN dialog in common controls take a structure called OPENFILENAME one of it's fields is lpfnHook which allows you to install your own handler.
OPENFILENAMEA (commdlg.h) - Win32 apps | Microsoft Docs[^]
In your handler in the WM_NOTIFY message you handle the CDN_TYPECHANGE message
CDN_TYPECHANGE notification code (Commdlg.h) - Win32 apps | Microsoft Docs[^]
So a minimal handler looks like this
UINT_PTR CALLBACK OpenHookProc(HWND hDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch (Msg)
{
case WM_NOTIFY:
{
LPOFNOTIFY pnh = (LPOFNOTIFY)lParam;
if (pnh && (pnh->hdr.code == CDN_TYPECHANGE))
{
switch (pnh->lpOFN->nFilterIndex)
{
case 0:
break;
case 1:
break;
}
}
break;
}
}
return (0);
}
In vino veritas
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I already intercept CDN_TYPECHANGE in my OnTypeChange ()
...to change the directory what code I have to write where in your example you put the rem
// First extension type selected
and
// Second selection type selected
for list in my CFileDialog a different dir?
Thank's
I Try, but I'm not sure )
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So just change directory then invalidate the dialog so it refreshes, you did all the hard part
SetCurrentDirectory function (winbase.h) - Win32 apps | Microsoft Docs[^]
Do remember if you want to go back to the original directory after the dialog closes, save the directory before you call the dialog with GetCurrentDirectory and the set it back when you exit.
In vino veritas
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I changed the dir with SetCurrent Directory , I invalidated and I did UpdateData(false) for refresh but nothing happens ...
I Try, but I'm not sure )
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I guess that UpdateData has nothing to do with what you are trying to achieve.
Could you post your actual code?
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void MyClass::OnTypeChange()
{
if(m_ofn.nFilterIndex==2){ // .doc
char szPath [MAX_PATH] = {"c:\\DocFiles"};
SetCurrentDirectory(szPath);
} else { // .txt
char szPath2 [MAX_PATH] = {"c:\\TxtFiles"};
SetCurrentDirectory(szPath2);
}
Invalidate();
UpdateData(false);
// Here I want refresh the CFileDialog with the new filter and path
}
I Try, but I'm not sure )
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No, this code won't work.
SetCurrentDirectory just sets the current directory. It cannot change the folder selection within the CFileDialog.
You have to find the possibility to change the folder selection within the CFileDialog control(s)!
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ok, and what are these controls? can you send me an example code? Thank you
I Try, but I'm not sure )
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Try instead to overwrite the m_ofn member lpstrFile to contain the full folder path,
either "c:\DocFiles" or "c:\TxtFiles".
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sorry, it doesn't work
I Try, but I'm not sure )
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Could you post your implementation?
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I try 2 solution:
void MyClass::OnTypeChange()
{
if(m_ofn.nFilterIndex==2){ // .doc
char szPath [MAX_PATH] = {"c:\\DocFiles"};
SetCurrentDirectory(szPath);
m_ofn.lpstrFile=szPath;
} else { // .txt
char szPath2 [MAX_PATH] = {"c:\\TxtFiles"};
SetCurrentDirectory(szPath2);
m_ofn.lpstrFile=szPath2;
}
Invalidate();
UpdateData(false);
}
and
void MyClass::OnTypeChange()
{
if(m_ofn.nFilterIndex==2){ // .doc
char szPath [MAX_PATH] = {"c:\\DocFiles\\file.doc"};
//SetCurrentDirectory(szPath);
m_ofn.lpstrFile=szPath;
} else { // .txt
char szPath2 [MAX_PATH] = {"c:\\TxtFiles\\file.txt"};
//SetCurrentDirectory(szPath2);
m_ofn.lpstrFile=szPath2;
}
Invalidate();
UpdateData(false);
}
But don't work.
N.B.: c:\DocFiles\file.doc and c:\TxtFiles\file.txt are existing files on the disk.
I Try, but I'm not sure )
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Have you already customized your CFileDialog?
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