d191.bmp.txt

Visual C++通信编程实例

           }
case WAIT_OBJECT_O+1 :11等待结束
           {
             TRACE(_TEXT("stop read event set\n"》;
 nRet=-3;
             goto Exit;
           }
case WAIT_TIMEOUT :
          {
 nRet=-2;
             goto Exit;
            }
case WAIT_FAILED:／，等待失败
    {
    TRACE(_TEXT(”read WAIT_FAILED:、I1”));
    nRet=-l：
    goto Exit;
    }
default:，，这种情况决不能发生
    {
    TRACE(_TEXT("Unexpected Wait return value’%x…),dwHandleSignaled);
    nRet=-l：
    goto Exit;
    )
  )
     if (GetOverlappedResult(m_hFileHandle,
              &m_overlappedRead,&dwHaveReaded, FALSE》
     {
 nRet=l;
          goto Exit;
     }
else
     {
            //cause by Purge(PURGE_RXABORT)
              TRACE(_TEXT("read operation error \n "》;
 nRet=-l;
    }
Exit:
if(nRet!=l)
Purge(PURGE_RXABORT);//W淌读操作
retum nRet;
其中，lpszInputBuffer表示存放返回数据的字符串缓冲区；dwCount表示希望要读到的
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