File extension setup on CFileDialog

[mesajflaviu]

My intention is to setup an scecific file extension on CFileDialog ... For that, I derived a class from CFileDialog, named CFileDialogExt. I have 5 different file types, like this:

LPTSTR szFilter = _T("Bitmap Files (*.bmp)|*.bmp|Gif Files (*.gif)|*.gif|Jpeg Files (*.jpg)|*.jpg|Png Files (*.png)|*.png|Tiff Files (*.tiff)|*.tiff||");

and the call is simple:

CFileDialogExt dlg(FALSE, NULL, NULL, OFN_FILEMUSTEXIST, szFilter); // <-- Saving operation

Ok, in order to catch file type changing, I override CFileDialogExt::OnTypeChange(), just ike that:

void CFileDialogExt::OnTypeChange()
{
   // TODO: Add your specialized code here and/or call the base class

   CFileDialog::OnTypeChange();

   CString sExt(GetFileExt());

   switch(GetOFN().nFilterIndex)
   {
   case 1:
      sExt.Format(_T("bmp"));
      break;
   case 2:
      sExt.Format(_T("gif"));
      break;
   case 3:
      sExt.Format(_T("jpg"));
      break;
   case 4:
      sExt.Format(_T("png"));
      break;
   case 5:
      sExt.Format(_T("tiff"));
      break;
   }

   SetDefExt((LPCSTR)(LPCTSTR)sExt);
}

but the SetDefExt does work delayed with one step ... here is the behavior:

I type "test" as file name. I chose "gif" extension. Nothing happen, the file name is the same.
I chose "jpg". The file name is changing as "test.gif".
I chose "png". The file name is changing as "test.jpg".

Do you know what I mean ? The file name is changing by the previous file extension choose.

I attach a test project to have a sample of what I wrote here ... Is there a solution to setup the right file name at the user file type choosing ?

Thank you.

TestFD.zip