打开子对话框 选择文件

 CString strFilter(_T("BMP FILE(*txt)|*txt||"));

 CFileDialog filedlg(TRUE,NULL,NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,strFilter);//read file   
 if (filedlg.DoModal() != IDOK)  return; 
 



imagePath = filedlg.GetPathName();///