winform读取电子磅秤数据

我想做一个winform窗口，只有两个控件，一个显示重量的textbox，一个磅重的button，电子磅秤通过COM口连接电脑，点击button后textbox就立即显示重量，请问怎样实现！我是一名菜鸟，请大家多多指教！谢谢！

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

添加一个SerialPort控件，设好后，就可以用了。
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;
namespace 读取条形码
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        //定义 SerialPort对象
        SerialPort port1;        //初始化SerialPort对象方法.PortName为COM口名称,例如"COM1","COM2"等,注意是string类型
        public void InitCOM(string PortName)
        {
            port1 = new SerialPort(PortName);
            port1.BaudRate = 9600;//波特率
            port1.Parity = Parity.None;//无奇偶校验位
            port1.StopBits = StopBits.Two;//两个停止位
            port1.Handshake = Handshake.RequestToSend;//控制协议
            port1.ReceivedBytesThreshold = 4;//设置 DataReceived 事件发生前内部输入缓冲区中的字节数
            port1.DataReceived += new SerialDataReceivedEventHandler(port1_DataReceived);//DataReceived事件委托

            byte[] WriteBytes = Encoding.ASCII.GetBytes("AT+CGMI\r");
        }        //DataReceived事件委托方法
        private void port1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                StringBuilder currentline = new StringBuilder();
                //循环接收数据
                while (port1.BytesToRead > 0)
                {
                    char ch = (char)port1.ReadByte();
                    currentline.Append(ch.ToString());
                }
                //在这里对接收到的数据进行处理
                textBox2.Text = currentline.ToString();
                currentline = new StringBuilder();
                port1.Close();
            }
            catch (Exception ex)
            {
                textBox2.Text = ex.Message.ToString();
            }        }        //打开串口的方法
        public void OpenPort()
        {
            try
            {
                port1.Open();
            }
            catch { }
            if (port1.IsOpen)
            {
                textBox3.Text = "the port is opened!";
            }
            else
            {
                textBox3.Text = "failure to open the port!";
            }
        }        //关闭串口的方法
        public void ClosePort()
        {
            port1.Close();
            if (!port1.IsOpen)
            {
                textBox3.Text = "the port is already closed!";
            }
        }        //向串口发送数据
        public void SendCommand(string CommandString)
        {
            byte[] WriteBuffer = Encoding.ASCII.GetBytes(CommandString);
            port1.Write(WriteBuffer, 0, WriteBuffer.Length);
        }
        private void Form1_Load(object sender, EventArgs e)
        {        }        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            string str = "";
            textBox1.Text = str;        }        private void button1_Click(object sender, EventArgs e)
        {
            //我现在用的COM1端口,按需要可改成COM2,COM3
            InitCOM("COM3");
            OpenPort();        }    }
}代码如上，读取来的信息并不是数值
我用测试软件把数据可以读取出来
数据如下
?Z潄?)ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
ST,GS,+    0.0 kg
US,GS,+    8.5 kg
US,GS,+    7.5 kg
US,GS,+    7.3 kg
US,GS,+    7.2 kg
US,GS,+    7.1 kg
US,GS,+    7.1 kg
US,GS,+    7.1 kg
US,GS,+    7.1 kg
US,GS,+    7.1 kg
US,GS,+    7.1 kg
US,GS,+    7.1 kg
US,GS,+    7.0 kg
US,GS,+    7.0 kg
US,GS,+    7.0 kg
US,GS,+    7.0 kg
US,GS,+    7.0 kg
US,GS,+    7.0 kg
US,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0 kg
ST,GS,+    7.0
一直不停的出数据我想实现
打开窗体就开始读取数据把数值显示在一个Label上(数值一直不停的在变化)  单击确认将最后显示的值传到另一个窗体上将程序生成好后一接受数据程序自动就关闭了我的代码是：
//加载事件
private void CzForm_Load(object sender, EventArgs e)
        {
            if (SpCom.IsOpen)
            {
                SpCom.Close();
            }
            else
            {
                SpCom.PortName = "COM1";
                SpCom.BaudRate = 2400;
                SpCom.Parity = Parity.None;
                SpCom.DataBits = 8;
                SpCom.StopBits = StopBits.One;
                SpCom.Open();
                this.SpCom.DataReceived += new SerialDataReceivedEventHandler(SpCom_DataReceived);
                //byte[] data = Convert.FromBase64String(SpCom.ReadLine());
                //this.textBox1.Text = Encoding.Unicode.GetString(data);
            }
        }private void SpCom_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            //使用委托进行跨线程读取数据
            label2.Invoke(new EventHandler(delegate
            {
                string txt = SpCom.ReadExisting();
                //txt = txt.Remove();
                txt = txt.Remove(0, 7);
                txt = txt.Remove(txt.LastIndexOf("kg"));
                label2.Text = txt.Trim();
            }));
        }退出将信息显示在另一个窗体上
private void button1_Click(object sender, EventArgs e)
        {            if (SpCom.IsOpen)
            {
                SpCom.Close();
            }
            AddYwxxForm.zl = this.label2.Text.Trim();
            this.Close();
        }那位大侠帮帮小弟吧感激不尽