switch(message)
    {
    case WM_CREATE:
          ZeroMemory( &ofn, sizeof(ofn) );
          ofn.lStructSize = sizeof(OPENFILENAME);
          ofn.hwndOwner = hwnd;
          ofn.hInstance = hMainHInst;
          ofn.lpstrFilter = TEXT("Text File(*.TXT)*.txtAll File(*.*)*.*");
          ofn.lpstrCustomFilter = NULL;
          ofn.nMaxCustFilter = 0;
          ofn.nFilterIndex = 1;
          ofn.lpstrFile = NULL;
          ofn.nMaxFile = 0;
          ofn.lpstrFileTitle=NULL;
          ofn.nMaxFileTitle = 0;
          ofn.lpstrInitialDir = NULL;
          ofn.lpstrTitle = NULL;
          ofn.Flags = 0;
          ofn.nFileOffset = 0;
          ofn.nFileExtension = 0;
          ofn.lpstrDefExt = NULL;
          ofn.lCustData = 0;
          ofn.lpfnHook = NULL;
          ofn.lpTemplateName = NULL;
        break;
 case WM_COMMAND:    //deal the menu command
  switch(LOWORD(wParam))
  {
  case IDM_OPEN:
      ofn.lpstrTitle = TEXT("打开");
      if(GetOpenFileName(&ofn))
          Save();
      break;