How To Initializing lpstrFilter for All Files on the Macintosh

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GetOpenFileName uses the lpstrFilter field of the OPENFILENAME structure to specify file filters. It points to a list of string pairs, separated by null characters. Each pair contains the display string and the filter pattern. On the Intel platform, a filter string of "*.*" specifies all files. The Windows Portability Library (WPL) uses "****", instead. Below is an MFC-based example:

        CString strFilter;
        CFileDialog dlgFile(TRUE);
        CString allFilter = "All Files (*.*)";
        strFilter += allFilter;
        strFilter += (TCHAR)'\0';   // Next string please.

#ifndef _MAC

        strFilter += _T("*.*");

#else

        strFilter += _T("****");

#endif

        strFilter += (TCHAR)'\0';   // Last string.
        dlgFile.m_ofn.lpstrFilter = strFilter;