Re: CFileDialog failure

"Giovanni Dicanio" <giovanni.dicanio@invalid.it> ha scritto nel messaggio
news:ObaBbsWEIHA.5976@TK2MSFTNGP02.phx.gbl...

This is a refactored version, which does not allocate the dialog class on
the heap, as Alexander's post pointed out:

<code>
//------------------------------------------------------------------
// Tests Open file dialog in multi-select mode.
//------------------------------------------------------------------
void CTestDlg::OnBnClickedButton1()
{
    // Max files in list (including folder path)
    const int MaxFileCount = 50;

    // Max TCHARs per file
    const int MaxFilePath = MAX_PATH;

    // Calculate approx size for the given number of max files.
    // The "+1" is for the terminating NUL (_T('\0')) character.
    const int MaxFileBuffer = MaxFileCount * MaxFilePath + 1;
    //const int MaxFileBuffer = 30; // TEST for small buffer

    // Buffer for file names
    std::vector< TCHAR > fileNamesBuffer(MaxFileBuffer);

    // File dialog object
    CFileDialog fileDlg(
        TRUE, // Open file dialog
        NULL, // No default extension
        NULL, // Initial file name
        OFN_HIDEREADONLY | OFN_ALLOWMULTISELECT,
        _T("All files (*.*)|*.*||"), // Filter
        this // Parent
        );

    // Hook our buffer to file dialog structure
    fileDlg.GetOFN().lpstrFile = &(fileNamesBuffer[0]);
    fileDlg.GetOFN().nMaxFile = (DWORD) fileNamesBuffer.size();

    bool okPressed = false;
    while ( true )
    {
        // Clear the first two bytes of lpstrFile filed,
        // so we don't see garbage from the previous iteration
        // (if the previous iteration failed).
        ::ZeroMemory( fileDlg.GetOFN().lpstrFile, 2 );

        // Run the dialog-box
        INT_PTR result = fileDlg.DoModal();

        // Check result
        if ( result == IDCANCEL )
        {
            // Failure or user pressed Cancel?
            DWORD dw = ::CommDlgExtendedError();
            if ( dw & FNERR_BUFFERTOOSMALL )
            {
                // Failure due to few buffer memory;
                // tell that to the user
                AfxMessageBox( _T("Too many files selected.") );

                // Do another iteration
                continue;
            }

            // User pressed cancel, or other error.
            // Quit loop.
            break;
        }

        // User pressed OK
        okPressed = true;

        // Quit loop
        break;
    }

    // Show selected files, if user pressed OK
    if ( okPressed )
        ProcessFileList( &(fileNamesBuffer[0]) );
}

</code>

Giovanni