CString 逆向查找字符串

  AllInput 待查找的完整字符串,key 被查找的子字符串
   {
     CString AllInput = GetAllTxt();
     CString key = _T("/r/n")+strGuestName;
    
     CString strLastInput;
     CString stemp = AllInput;
     int pos = stemp.ReverseFind('/r');
     while (pos>0)
     {
      CString sSub = stemp.Mid(pos); // 获得最后1行字符串
      if (sSub.Find(key)>=0)
      {
       // 最后1行字符串找到匹配字段
       strLastInput = AllInput.Mid(pos);
       break;
      }
      else
      {
       // 在最后1行字符串(pos右边)没有找到匹配字段，把右边部分截掉，用ReverseFind继续向左查找匹配字段
       stemp = stemp.Left(pos);
       pos = stemp.ReverseFind('/r');
      }
     }
    }