在标签上显示串口数据 [英] Show serial port data on label

问题描述

谁能帮助我，读取标签上的串行端口数据?
我可以读取串行端口数据，但无法在标签中显示它:

Who can help me about, read serial port data on label?
I can read serial port data, but i can not show it in the label:

private void DataRecievePort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
     byte[] data = new byte[DataRecievePort.BytesToRead];
     DataRecievePort.Read(data, 0, data.Length);
     ASCIIEncoding enc = new ASCIIEncoding();
     double Pu = Convert.ToInt32(enc.GetString(data));
     double Me = (Pu * 2);

     label1.Text = Convert.ToString(me); //This line gives error 
}

推荐答案

我猜想是因为.NET中存在交叉线程

该代码将解决您的问题.

这是sln链接:
http://imljh.ucoz.com/code/test_serialport_label.zip

I guess that because crossing thread in .NET

this code will solve your problem.

this is the sln link:
http://imljh.ucoz.com/code/test_serialport_label.zip

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

using System.Threading;

namespace test_serialport_label
{
    public partial class Form1 : Form
    {
        Thread t1;
        delegate void write_txt(string msg1);
        write_txt wr;
        public Form1()
        {
            InitializeComponent();
            t1 = new Thread(new ParameterizedThreadStart(drawer_intz));
            wr = new write_txt(drawer);
        }

        private void DataRecievePort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            byte[] data = new byte[DataRecievePort.BytesToRead];
            DataRecievePort.Read(data, 0, data.Length);
            ASCIIEncoding enc = new ASCIIEncoding();
            double Pu = Convert.ToInt32(enc.GetString(data));
            double Me = (Pu * 2);
            if (t1.IsAlive)
                t1.Abort();
            t1.Start(Convert.ToString(Me));
        }

        private void drawer_intz(object obj)
        {
            string Me2 = (string)obj;
            this.Invoke(wr, Me2);
        }

        private void drawer(string txt)
        {
            label1.Text = txt;
            label1.Refresh();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (t1 != null)
                t1.Abort();
        }
    }
}

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