Question

我有GPS跟踪器和RFID阅读器。我想把RFID卡放在RFID读卡器上后，我想看看最后的GPS位置。

在我的代码中，我获得了GPS-coordinantes的永久性。我有两个SerialPorts “gpsPort”和“rfidPort”。我不知道如何以这种方式中断两个EventHandler。你能解决问题或任何想法吗？

这是我的代码：

class Program
{
    static void Main(string[] args)
    {
        SerialPort gpsPort = new SerialPort("COM5");
        gpsPort.BaudRate = 9600;
        gpsPort.Parity = Parity.None;
        gpsPort.StopBits = StopBits.One;
        gpsPort.DataBits = 8;
        gpsPort.Handshake = Handshake.None;
        gpsPort.RtsEnable = true;
        gpsPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
        gpsPort.Open();

        SerialPort rfidPort = new SerialPort("COM4");
        rfidPort.BaudRate = 9600;
        rfidPort.Parity = Parity.None;
        rfidPort.StopBits = StopBits.One;
        rfidPort.DataBits = 8;
        rfidPort.Handshake = Handshake.None;
        rfidPort.RtsEnable = true;
        rfidPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler2);
        rfidPort.Open();
        Console.ReadKey();            
    }

     public static void  DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
    {

        SerialPort sp = (SerialPort)sender;

        string indata = sp.ReadExisting();

        if (indata.Contains("GPRMC"))
        {
            string[] sentence = indata.Split(',');

            string latitude = sentence[3].Substring(0, 2) + "°";
            latitude = latitude + sentence[3].Substring(2);
            latitude = latitude + sentence[4];

            string longitude = sentence[5].Substring(2, 1) + "°";
            longitude = longitude + sentence[5].Substring(3);
            longitude = longitude + sentence[6];

            Console.Write("Latitude:" + latitude + Environment.NewLine + "Longitude:" + longitude + Environment.NewLine + Environment.NewLine);
        }            
    }

     public static void DataReceivedHandler2(object sender, SerialDataReceivedEventArgs e)
    {
        SerialPort sp = (SerialPort)sender;
        string indata = sp.ReadExisting();

        Console.Write(indata + Environment.NewLine);       
    }
}

Answer 1

使string indata成为第一个DataReceived事件范围之外的静态变量。

class Program
{
    private static string indata_GPS = "";
....
}

现在你应该从GPS读取这个变量：

public static void  DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;
    indata_GPS = sp.ReadExisting();

只要第二个DataReceived事件从RFID设备触发，您就会从indata_GPS读出值。这样您就可以获得GPS的最新价值

public static void DataReceivedHandler2(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;
    string indata = sp.ReadExisting();

    Console.Write("RFID: " + indata + Environment.NewLine);
    Console.Write("GPS latest Data: " + indata_GPS  + Environment.NewLine);
}

我不知道如何中断两个EventHandler

无需中断任何事情;）

C＃在任务完成后从2个SerialPorts读取数据

1 个答案: