d065.bmp.txt

Visual C++通信编程实例

bRead = rIRUE;
bResult = GetOverlappedResult(port->m_hComm,    //Handle to COMM port
                   &port->m_ov, //Overlappedstructure
                                                       &BytesRead,     //Stores number ofbytes read
                                                                                           IRUE);                    // Wait flag
            // deal with the error code
         if (!bResult)
         {
                   port->ProcessErrorMessage("GetOverlappedResults() in ReadFile()");
          }
        // close if ( !bRead)
LeaveCriticalSection(&port->m_csCommunicationSync);
                             //notify parent that a byte was received
         ::SendMessage《port->m_pOwner)->m_hWnd, WM_COMM_RXCHAR, (WPARAIVD
RXBuff, (LPARAM) pcnt->m_nPortNr);
                          } // end foreverloop
          }
    5)写数据程序。在CSerialPort类中，写数据调用WriteToPort豳数，通过SetEvent函数
设置写事件，通知辅助线程有数据需要发送。写数据函数代码如下：
// Write a string to the port
void CSeriaIPort::WriteToPort(char* string)
{
        assert(m_hComm l= 0);
          memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer》;
         strcpy(m_szWnteBuffer, string);
SetEvent(m_hWriteEvent);
}
数据字符写入函数：
void CSeriaIPort::WriteChar(CSerialPort* port)
{
         BOOL bWrite = TRUE;
         BOOL bResult = TRUE;
         DWORD BytesSent = 0;
    ResetEvent(port->m hWriteEvent);
// Gain ownership of the critical section
EnterCriO:calSection(&port->m_csCommunicationSync);
if (bWrite)
{
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