如何显示在的serialport的DataReceived事件检索处理程序读出的数据 [英] How to display the data read in DataReceived event handler of serialport

问题描述

我必须从端口读下面的代码，需要的数据，然后在文本框显示。我使用DataReceived事件检索处理程序用于此目的，但DONOT知道如何来显示文本框此数据。从各种来源我得知Invoke方法应当用于这个但DONOT知道如何使用它。建议请...

 私人无效Form1_Load的（对象发件人，EventArgs五）
 {
 //的SerialPort mySerialPort =新的SerialPort（COM3）; 
 mySerialPort.PortName =COM3; 
 mySerialPort.BaudRate = 9600; 
 mySerialPort.Parity = Parity.None; 
 mySerialPort.StopBits = StopBits.One; 
 mySerialPort.DataBits = 8; 
 mySerialPort.Handshake = Handshake.None; 
 mySerialPort.DataReceived + =新SerialDataReceivedEventHandler（mySerialPort_DataReceived）; 
 mySerialPort.Open（）; 
} 
 
私人无效mySerialPort_DataReceived（对象发件人，SerialDataReceivedEventArgs E）
 {
的SerialPort SP =（的SerialPort）发送; 
字符串s = sp.ReadExisting（）; 
 //接下来，我想在一个文本框来显示s中的数据。 textbox1.text = s给出一个跨线程异常
} 
私人无效的button1_Click（对象发件人，EventArgs五）
 {
 
 mySerialPort.WriteLine（AT + CMGL = \ALL\）; 
 
} 
  

解决方案

在MSDN包含有关使用控制方法，并从其他线程特性例子很好的文章。

在总之，你需要的是那台文本框的文字属性与给定的字符串委托方法。然后，通过调用该委托从 mySerialPort_DataReceived 处理程序中TextBox.Invoke（）方法。事情是这样的：

 公共委托无效AddDataDelegate（字符串myString的）; 
公共AddDataDelegate myDelegate; 
 
私人无效Form1_Load的（对象发件人，EventArgs五）
 {
 // ... 
 this.myDelegate =新AddDataDelegate（AddDataMethod）; 
} 
 
公共无效AddDataMethod（字符串MyString的）
 {
 textbox1.AppendText（myString的）; 
} 
 
私人无效mySerialPort_DataReceived（对象发件人，SerialDataReceivedEventArgs E）
 {
的SerialPort SP =（的SerialPort）发送; 
字符串s = sp.ReadExisting（）; 
 
 textbox1.Invoke（this.myDelegate，新的对象[] {S}）; 
} 
  

I have the following code which needs the data to be read from port and then display in a textbox. I am using DataReceived event handler for this purpose but donot know how to display this data in textbox. From various sources i learnt that Invoke method should be used for this but donot know how to use it. Suggestions please...

    private void Form1_Load(object sender, EventArgs e)
    {
        //SerialPort mySerialPort = new SerialPort("COM3");
        mySerialPort.PortName = "COM3";
        mySerialPort.BaudRate = 9600;
        mySerialPort.Parity = Parity.None;
        mySerialPort.StopBits = StopBits.One;
        mySerialPort.DataBits = 8;
        mySerialPort.Handshake = Handshake.None;
        mySerialPort.DataReceived += new SerialDataReceivedEventHandler(mySerialPort_DataReceived);
        mySerialPort.Open();
    }

    private void mySerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        SerialPort sp = (SerialPort)sender;
        string s= sp.ReadExisting();
        // next i want to display the data in s in a textbox. textbox1.text=s gives a cross thread exception
    }
    private void button1_Click(object sender, EventArgs e)
    {

        mySerialPort.WriteLine("AT+CMGL=\"ALL\"");

    }

解决方案

The MSDN contains a good article with examples about using control methods and properties from other threads.

In short, what you need is a delegate method that sets the Text property of your text box with a given string. You then call that delegate from within your mySerialPort_DataReceived handler via the TextBox.Invoke() method. Something like this:

public delegate void AddDataDelegate(String myString);
public AddDataDelegate myDelegate;

private void Form1_Load(object sender, EventArgs e)
{
    //...
    this.myDelegate = new AddDataDelegate(AddDataMethod);
}

public void AddDataMethod(String myString)
{
    textbox1.AppendText(myString);
}

private void mySerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
   SerialPort sp = (SerialPort)sender;
   string s= sp.ReadExisting();

   textbox1.Invoke(this.myDelegate, new Object[] {s});       
}

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