外部类处理程序与UI交互

时间:2013-09-04 19:14:22

标签: c# serial-port

我目前正在开发一个通过SerialPort类与外部设备通信的类,但我需要根据设备发回的消息更新UI。

我尝试了以下代码,但它不起作用:

using System.IO.Ports;

namespace LearningSteps
{
    /// <summary>
    /// Interaction logic for Comm.xaml
    /// </summary>
    /// 

    public class Teste
    {
        private SerialPort _myPort;

        public Teste(SerialPort P) { _myPort = P; }

        public void Funcao(SerialDataReceivedEventHandler H)
        {
            _myPort.DataReceived += H;
            byte[] vetor = new byte[] { 0x24, 0x24, 0xCF, 0x00, 0x01, 0x02, 0x25, 0x33, 0x7E };
            _myPort.Write(vetor, 0, 9);
        }
    }

    public partial class Comm : Window
    {
        SerialPort port;
        Teste T;

        public delegate void AtualizaCallBack(string message);
        System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();

        public Comm()
        {
            InitializeComponent();
            port = new SerialPort("COM5",115200,Parity.None,8,StopBits.One);
            port.RtsEnable = false;
            port.DtrEnable = false;
            port.Handshake = Handshake.None;
            port.NewLine = "~";
            port.Open();
            T = new Teste(port);

        }

        private void Recebido(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            String indata = sp.ReadExisting();

            my_label.Dispatcher.Invoke(new AtualizaCallBack(this.atualiza),new object[]{indata});

        }

        private void bt_Click(object sender, RoutedEventArgs e)
        {
            T.Funcao(Recebido);
        }

        private void atualiza(string s)
        {
            byte[] vet = encoding.GetBytes(s);
            my_label.Content = BitConverter.ToString(vet);
        }

    }
}

我尝试编译时遇到错误,我认为是因为我正在尝试发送内部SerialDataReceivedEventHandler作为参数。但我不知道如何使用T.Funcao并更新我的UI。

错误说: “PresentationFramework.dll中发生了'System.Window.Markup.XamlParseException'类型的未处理异常

附加信息:'与指定的绑定约束匹配的构造函数类型'LearningSteps.Comm'的调用引发了异常。行号“3”和行位置“9”。

如果存在此异常的处理程序,则可以安全地继续该程序。“

有人可以帮帮我吗?

0 个答案:

没有答案