Opening multiple files in an MFC dialog application

[ahammad]

I want to be able to select mutliple files from a standard File Open dialog box, and be able to open all those files simultaneously.

How can this be done? Is there a specific flag that you can use in the CFileDialog class constructor?

This is how I've been doing it, but just for one file:

CFileDialog FileDlg(TRUE, _T("*.txt"), NULL, 0, _T("Text Files (*.txt)|*.txt|" ));

Thanks

[weaknessforcats]

Read this. Especially, how to use OFN_ALLOWMULTISELECT.

[ahammad]

Thanks, I finally got it to work, but now there is another problem.

If I select a small number of files, it works. If I select a larger number of files (+5), it exits the loop as if I had clicked "cancel" in the dialog box.

CFileDialog cfileDlg( TRUE, _T("*.cpf"), NULL, OFN_ALLOWMULTISELECT, _T("CPF Files (*.cpf)|*.cpf|" ));
 
    CString csFileDlgTitle;
 
    cfileDlg.m_ofn.lpstrTitle = csFileDlgTitle;
 
    //int nRet = cfileDlg.DoModal( );
    //ASSERT( ( nRet != IDOK ) || ( nRet != IDCANCEL ) );
 
    if (cfileDlg.DoModal() != IDOK) {
        return;    //EXITS HERE IF I SELECT A LOT OF FILES, REGARDLESS OF WHAT I CLICK//
    }
 
    POSITION pos ( cfileDlg.GetStartPosition() );
 
    while( pos )
    {
        CString csFileName(  cfileDlg.GetNextPathName( pos ) );
 
        FileOpenInput(csFileName);

The code that was commented out worked before, I took it out for other reasons.

I marked where the function terminates. That if statement is meant to be entered if the user clicks cancel in the File Open dialog box. What is the reason for this?

Thanks

[weaknessforcats]

So if DoModal() does not return IDOK, then what does it return??

I would have expected code like:

if (cfileDlg.DoModal() == IDCANCEL)
{
        switch(CommDlgExtendedError())
        {
              case: CDERR_FINDRESFAILURE
                       // etc...
                      break;
//etc...
}
//Then you get here on IDOK