MFC 打开对话框，选择文件

// TODO: Add your control notification handler code here
    CFileDialog dlg( FALSE,
        _T("cat"),
        NULL,
        OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_NOCHANGEDIR,
        _T("Catalog Data File (*.cat)|*.cat|||"));

    //Set Title
    dlg.m_ofn.lpstrTitle = _T("Assign a catalog data file name");

    if(dlg.DoModal() != IDOK)
    {
        return;
    }
    else
    {
        if (theApp.m_CatalogDataBuilder.SaveCheckedDataToFile(dlg.GetPathName()))
        {
            AfxMessageBox(_T("Saved!"), MB_ICONINFORMATION);
        }
    }