Question

我正在尝试通过串口发送和接收数据，我可以正常从DataReceived事件中获取数据现在，我创建了一个库，它被开发用于通过串口发送和接收数据。我不知道如何通过两种不同的方法发送命令和检索价值这让我很困惑，请帮助我！

    static void Main(string[] args)
    {
        FXReader reader = new FXReader();
        reader.ComPort = port;
        reader.Connect();

        Console.WriteLine(reader.SetPortPower(1));
        Console.ReadLine();
        Console.WriteLine(reader.GetPortStatus(1));
        Console.ReadLine();
    }

public class FXReader : IDisposable
{
    private SerialPort rs232 = null;

    public string ComPort
    {
        get { return rs232.PortName; }
        set { rs232.PortName = value; }
    }

    public bool IsConnected
    {
        get { return rs232.IsOpen; }
    }

    public F520Reader()
    {
        rs232 = new SerialPort();
        rs232.BaudRate = 115200;            
        rs232.Parity = Parity.None;
        rs232.DataBits = 8;
        rs232.StopBits = StopBits.One;
        rs232.DataReceived += new SerialDataReceivedEventHandler(rs232_DataReceived);
    }

    public void Connect()
    {
        rs232.Open();
    }

    public void Disconnect()
    {
        rs232.Close();
    }

    public int GetPortPower(int port)
    {
        if (rs232.IsOpen)
        {
            byte[] command = { 0x5A, 0x00, 0x19, 0x00, 0x01, 0xFF, 0xFF, 0x7E };
            rs232.Write(command, 0, command.Length);

            //How can i get value from the event of "rs232_DataReceived"
            return powervalue;
        }
    }

    public int GetPortStatus(int port)
    {
        if (rs232.IsOpen)
        {
            byte[] command = { 0x5A, 0x00, 0x19, 0x00, 0x01, 0xFF, 0xFF, 0x7E };
            rs232.Write(command, 0, command.Length);

            //How can i get value from the event of "rs232_DataReceived"
            return statusvalue;
        }
    }

    void rs232_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        System.Threading.Thread.Sleep(50);
        if (rs232.BytesToRead > 0)
        {
            byte[] recvBuffer = new byte[1024];
            int recvLength = rs232.Read(recvBuffer, 0, recvBuffer.Length);
            Array.Resize(ref recvBuffer, recvLength);

            PharseResponse(recvBuffer);
        }
    }

    private void PharseResponse(byte[] buffer)
    {
        if (buffer[0] == 0x5A && buffer[buffer.Length - 1] == 0x7E)
        {
            #region Response for Get Port Power
            if (buffer[1] == 0x01 && buffer[2] == 0x13)
            {
                //How can I return value by the method of "GetPortPower"
                return buffer[7];
            }
            #endregion

            #region Response for Get Port Status
            if (buffer[1] == 0x01 && buffer[2] == 0x14)
            {
                //How can I return value by the method of "GetPortStatus"
                return buffer[7];
            }
            #endregion
        }
    }       

    #region IDisposable Members

    public void Dispose()
    {
        if (rs232.IsOpen)
            rs232.Close();

        rs232.Dispose();
    }

    #endregion
}

Answer 1

这肯定不是＆＃34;最佳方式＆＃34;。使用DataReceived事件无法获得任何好处。它在事件驱动的应用程序中很有用，例如GUI应用程序。但不是在这样的应用程序，你必须得到一个响应，然后才能继续你的程序。

所以根本不使用它，而是直接调用Read（）方法。您的程序将阻止，直到设备发回信息为止。

这也可以帮助您编写正确的代码，现在不正确。从串口读取通常只产生一个或两个字节。 Read（）的返回值告诉您有多少。在获得完整之前，您无法解析响应。从您当前的代码中可以看出，＆＃34;完成＆＃34;看起来像，但在PharseResponse（）方法停止使用IndexOutOfRangeException崩溃之前，您需要至少接收8个字节。串行协议通常使用特定的字节值来指示响应的结束。

从库中的串行端口返回值的最佳方法

1 个答案: