Question

我是stackoverflow的新手。我遇到VC＃Serial Communication问题。我需要从串口连续接收数据，但我的代码只能工作一次。那就是我发送“这是一个串行通信项目”。数据按预期接收，但如果我再次发送数据则无效。请提供解决方案。

private void button1_Click(object sender, EventArgs e)
{

        mySerialPort.PortName = cbxCOMPort.Text;
        mySerialPort.BaudRate = int.Parse(cbxBaudrate.Text);
        mySerialPort.Parity = Parity.None;
        mySerialPort.StopBits = StopBits.One;
        mySerialPort.DataBits = 8;
        mySerialPort.Handshake = Handshake.RequestToSend;
        mySerialPort.ReadTimeout = int.Parse(cbxTimeout.Text);
        mySerialPort.WriteTimeout = 2000;
        mySerialPort.DtrEnable = true;
        mySerialPort.RtsEnable = true;
        mySerialPort.Encoding = Encoding.ASCII;
        mySerialPort.NewLine = "\r\n";
        mySerialPort.ReadBufferSize = 512;

        mySerialPort.DataReceived += port_DataReceived;

        mySerialPort.Open();

        button1.Enabled = false;
        button2.Enabled = true;
        gbxMsgDel.Enabled = true;

}

private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{// Event for receiving data

        // Read the buffer to text box.

        this.Invoke(new EventHandler(DoUpdate));

}

private void DoUpdate(object s, EventArgs e)
{
        receivedMessage += mySerialPort.ReadExisting();

}

receivedMessage是一个私有字符串类型。这是私人的。

Answer 1

我之前遇到过类似的问题......

来自MSDN

“不保证每个字节都会引发DataReceived事件接收到的“

一种选择是使用计时器来检查可用数据而不是事件，如下所示：

private void checkPortDataTimer_Tick(object sender, EventArgs e)
{
    //You may want to check available bytes instead of this.
    string recievedData = comPort.ReadExisting();
    if (!string.IsNullOrEmpty(recievedData))
        someTextBox.Text += recievedData;
}

干杯

DataReceived EventHandler只能运行一次

1 个答案: