使用serialport类，如何判断接收的数据已经中断？

Question

将上面的语句放在 serialPort1_DataReceived事件当中，

Answer 1

 private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            byte r_byte;
            while (serialPort1.BytesToRead != 0)
            {
                r_byte = Convert.ToByte(serialPort1.ReadByte());
                switch (r_flag)
                {
                    case 0:
                        if (r_byte == 0xaa)
                        {
                            r_flag += 1;
                            serial_input[0] = r_byte;
                        }
                        break;
                    case 1:
                        if (r_byte == 0xaa)
                        {
                            r_flag += 1;
                            serial_input[1] = r_byte;
                            r_count = 0;
                        }
                        else
                        {
                            r_flag = 0;
                            r_count = 0;
                        }
                        break;
                    case 2:
                        serial_input[r_count + 2] = r_byte;
                        r_count += 1;
                        if (serial_input[2] != 0xd0)
                        {
                            if (r_count == 4)
                            {
                                r_flag = 0;
                                r_count = 0;
                                rs_cl();//调用接收处理函数
                            }
                        }
                        else
                        {
                            if (r_count == 0x14)
                            {
                                r_flag = 0;
                                r_count = 0;
                                rs_cl();//调用接收处理函数
                            }                        }
                        break;
                }
            }
        }

Answer 2

这个方法我用了，代码如下：
在serialPort_DataReceived事件中：
try
{
                if (czSerialPort.BytesToRead == 0)
                {
                    strczData = "Error";
                }
                else
                {
                    //定义接收数据长度
                    int bytesRead = czSerialPort.BytesToRead;
                    byte firstbyte = Convert.ToByte(czSerialPort.ReadByte());
                    //判断第一个字节是否是起始位：16进制的0x02
                    if (firstbyte == 0x02)
                    {
                        byte[] bytesData = new byte[bytesRead];
                        for (int i = 0; i <= bytesRead - 2; i++)
                        {
                            byte byteData = Convert.ToByte(czSerialPort.ReadByte());
                            //判断数据结束字节
                            if (byteData == 0x03)
                                continue;
                            bytesData[i] = byteData;
                        }
                        //将字节数组转换成字符串
                        strczData = System.Text.Encoding.Default.GetString(bytesData);
                        //截取数据（舍去校验和等字符）
                        strczData = strczData.Remove(7);
                        //通过捕获异常来转换接收到的字符串
                        try
                        {
                            int intczData = Convert.ToInt32(strczData);
                            strczData = Convert.ToString(intczData);
                        }
                        catch
                        {
                            strczData = "Error";
                        }
                    }
}
catch (exection czerror)
{
    MessageBox.Show(czerror.Message);
}在代码中加入了你说的判断仍旧不行。

Answer 3

你可以可以用API写,这样就有延时参数可以用了

Answer 4

SERIALPORT_DATARECEIVED 怎么触发啊，我的每次都不执行啊？