d194.bmp.txt

Visual C++通信编程实例

194
            {
                       //Time to get the results of the WriteFile
  break;
             }
case WAIT_TIMEOUT :
           {
               TRACE(_TEXT("write time out\n"》;
 nRet=-2;
                goto Exit;
             }
 case WAIT_FAILED: //Wait failed.    Shouldn't happen.
             {
                     TRACE(_TEXT("Write WAIT_FAILED: \n "》;
 nRet=-l;
                 goto Exit;
              }
    case WAIT_OBJECT_O+1:
              {
                  //stop event set
                  TRACE(_TEXT("stop event set"》;
 nRet=-3;
                goto Exit;
             }
default: //This case should never occur.
{
        TRACE(_TEXT("Unexpected Wait retum value '%x"'),dwHandleSignaled);
nRet=-l;
      goto Exit;
    )
  )
，，判断是否已经结束
  if(!GetOverlappedResult(m_hFileHandle,
    &m_overlappedWrite,
    &dwHaveWritten,
    TRUE》
  {
    dwLastError= GetLastError().
//Its possible for this error to occur if the
// service provider has closed the port.
if (dwLastError - ERROR_INVALID_HANDLE)
 {
                    TRACE(_TEXr( "ERROR_INVALID_HANDLE,
            Likely that the Service Provider has closed the port.\n"》;
nRet=-l;
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