后台串口读取循环

Question

有一个STM32设备，每2秒通过串行端口发送一个AES加密的十六进制数据。所有消息都以换行结束。我的程序（带有用户界面，而不是控制台程序）能够从串行读取并解密数据，即使在循环中仍然运行良好，但问题是在循环中我不能使用断开连接功能，所以我的程序留在 "infinite loop"。这是一个代码：

public void button1_Click(object sender, EventArgs e)
{
    try 
    {
        serialPort1.PortName = cBoxComPort.Text;
        serialPort1.BaudRate = 9600;
        serialPort1.DtrEnable = true;
        serialPort1.ReadTimeout = 5000;
        serialPort1.WriteTimeout = 500;
        serialPort1.Open();
        lblStatusCom.Text = "Connected";
        lblMessage.Text = "I am on!";

        while (serialPort1.IsOpen)
        {
            string mgs1 = serialPort1.ReadLine();
            byte[] key = { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F };
            byte[] enc = StringToByteArray(mgs1);
            byte[] dec = Decrypt(enc, key);
            lblMessage.Text = getString(dec);
        }
    }
    catch(Exception err)
    {
        MessageBox.Show(err.Message,"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        //lblStatusCom.Text = "Disconnected";
    }
}

我如何"put to background"这个循环过程，以便用户可以单击断开连接，如果他想退出阅读？

Answer 1

这是一个使用 DataReceived 事件的版本：

单击按钮即可打开端口并注册事件

public void button1_Click(object sender, EventArgs e)
{
    try 
    {
        serialPort1.PortName = cBoxComPort.Text;
        serialPort1.BaudRate = 9600;
        serialPort1.DtrEnable = true;
        serialPort1.ReadTimeout = 5000;
        serialPort1.WriteTimeout = 500;
        serialPort1.Open();
        lblStatusCom.Text = "Connected";
        lblMessage.Text = "I am on!";

        serialPort1.DataReceived += portDataReceived;

    }
    catch(Exception err)
    {
        MessageBox.Show(err.Message,"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        //lblStatusCom.Text = "Disconnected";
    }
}

private void portDataReceived(object sender, EventArgs args)
{
    SerialPort port = sender as SerialPort;

    if (port == null)
    {
        return;
    }

    string mgs1 = port.ReadLine();
    byte[] key = { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F };
    byte[] enc = StringToByteArray(mgs1);
    byte[] dec = Decrypt(enc, key);
    if (lblMessage.InvokeRequired)
    {
        lblMessage.Invoke(new Action(()=> lblMessage.Text = getString(dec)));
    }
    else
    {
        lblMessage.Text = getString(dec);
    }
}

后台串口读取循环

Serial port reading loop in background

c#

serial-port

while-loop