c# 循环com，分别对串口写入与读取，获取需要的串口信息

骑猪看日落 2022-01-05 12:25 188阅读 0赞

private SerialPort serialPort;//串口对象类
    
            private string strPortDataReceived = "";//记录串口返回值
            private string serialPortName = "";//记录端口号
    
            private bool isGet = false;
    
    
            /// <summary>
            /// 获取产品设备号
            /// </summary>
            /// <returns>设备号</returns>
            public List<string> GetProductNumBySerialPort()
            {
                List<string> productNumList = new List<string>();
                string[] ports = SerialPort.GetPortNames();
                if (ports.Length > 0)
                {
                    for (int i = 0; i < ports.Length; i++)
                    {
                        string portName = ports[i];
    
                        serialPort = new SerialPort(portName, 115200, Parity.None, 8, StopBits.One);
                        //serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);//DataReceived事件委托
                        serialPort.ReceivedBytesThreshold = 1;
                        serialPort.RtsEnable = true;
                        serialPort.WriteTimeout = 500;
                        serialPort.ReadTimeout = 500;
                        try//这里写成异常处理的形式以免串口打不开程序崩溃
                        {
                            serialPort.Open();
                        }
                        catch { }
                        if (serialPort.IsOpen)
                        {
                            //byte[] ar = StringToByteHelper.HexStringToByteArray("1F1109");
                            byte[] WriteBuffer = new byte[] { 0x1F, 0x11, 0x09 };
                            try
                            {
                                serialPort.Write(WriteBuffer, 0, WriteBuffer.Length);//获取设备编号
                            }
                            catch (Exception ex)
                            {
                                string str = ExceptionClass.GetExceptionMsg(ex, "串口读写超时"+ "\r\n");
                                ExceptionClass.WriteException(str);
                            }//Thread.Sleep(100);
                            int r = 0;
                            //读取返回数据
                            while (serialPort.BytesToRead == 0)
                            {
                                r++;
                                Thread.Sleep(1);
                                if (r >= 500)
                                {
                                    break;
                                }
                            }
                            Thread.Sleep(50); //50毫秒内数据接收完毕，可根据实际情况调整
                            r = 0;
                            byte[] recData = new byte[serialPort.BytesToRead];
                            serialPort.Read(recData, 0, recData.Length);
                            string strPortDataReceived = System.Text.Encoding.Default.GetString(recData);
                            Console.WriteLine(strPortDataReceived);
                            if (strPortDataReceived.Length >= 17)
                            {
                                productNumList.Add(strPortDataReceived.Substring(2, 4));
                            }
                            serialPort.Close();//关闭该端口
                        }
                        else
                        {
                            //MessageBox.Show("串口打开失败!");
                            //return false;
                        }
                    }
                }
                else
                {
                    //MessageBox.Show("没有可用的串口!");    
                }
                return productNumList;
            }

转载于:https://www.cnblogs.com/xunyiHe/p/10538794.html