VB/C++/C#串口通讯源代码【附详细注释】
VB
If MSComm1.PortOpen = True Then MSComm1.PortOpen = False
MSComm1.CommPort = i1
MSComm1.PortOpen = True
MSComm1.InputMode = comInputModeBinary
MSComm1.InBufferCount = 0
MSComm1.InputLen = 0
MSComm1.Settings = "9600,N,8,1"
MSComm1.RThreshold = 1
MSComm1.OutBufferCount = 0
C++
/****************************************************************/
//串行口初始化
if(m_ctrlComm.GetPortOpen()) //如果串口已经打开，则关闭。
m_ctrlComm.SetPortOpen(FALSE);
m_ctrlComm.SetCommPort(1); //选择com1
if( !m_ctrlComm.GetPortOpen()) 字串9
m_ctrlComm.SetPortOpen(TRUE); //打开串口
else
AfxMessageBox("不能打开串行口！");
m_ctrlComm.SetSettings("9600,n,8,1"); //波特率9600，无校验，8个数据位，1个停止位
m_ctrlComm.SetInputMode(1); //1：表示以二进制方式检取数据
m_ctrlComm.SetRThreshold(1); //参数1表示每当串口接收缓冲区中有多于或等于1个字符时将引发一个接收数据的OnComm事件
m_ctrlComm.SetInputLen(0); //设置当前接收区数据长度为0
m_ctrlComm.GetInput(); //先预读缓冲区以清除残留数据
/****************************************************************/
C#
if (this.axMSComm1.PortOpen == true)
this.axMSComm1.PortOpen = false;
this.axMSComm1.CommPort = 1;//端口 字串2
this.axMSComm1.Settings = "9600,n,8,1";//通信参数
&
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