串口如何接收数据，接收到又如何处理

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http://topic.csdn.net/u/20090728/09/1E9D9C81-FC4A-4025-B350-A4D44E28E566.html

using System.IO.Ports;using System.Threading;

using System.IO;

namespace SerialPortDemo

{ 

public partial class Form1 : Form 

{ bool isStar = false;

 Thread threadReceive = null;

 SerialPort serialPort = null;

 int i = 0; int k = 0; public Form1() 

{ InitializeComponent();

 this.comboBox1.SelectedIndex = 0;

 this.comboBox2.SelectedIndex = 2;

 serialPort = new SerialPort(); 

if (serialPort.IsOpen) serialPort.Close(); 

//获得参数 

serialPort.PortName = comboBox1.SelectedItem.ToString();

 serialPort.BaudRate = int.Parse(comboBox2.SelectedItem.ToString());

 serialPort.Open(); ThreadStart method = new ThreadStart(ReceiveData);

//在线程上执行此方法 

threadReceive = new Thread(new ThreadStart(method)); 

} 

private void button1_Click(object sender, EventArgs e)

 { try { if (button1.Text == "接收数据")

 { 

if (!isStar)

//如果isStar等于true,则启动线程

 { 

threadReceive.Start(); this.toolStripStatusLabel1.Text = "正在接收数据......"; 

} 

else { 

threadReceive.Resume();

//如果isStar等于false,则解除挂起线程 this.toolStripStatusLabel1.Text = "暂停接收..."; }

 button1.Text = "停止接收"; }

 else

 { 

threadReceive.Suspend();

//如果是"停止接收",则挂起线程

 button1.Text = "接收数据"; 

this.toolStripStatusLabel1.Text = "暂停接收..."; 

}

 }

 catch (Exception ex) 

{ MessageBox.Show(ex.Message); serialPort.Close();

 }

 } 

//不断循环接收数据

 private void ReceiveData()

 { 

while (true) 

{ Thread.Sleep(500); 

this.isStar = true;

 this.SynReceiveData(); 

}

 } 

//通过串口取数据 

private void SynReceiveData()

 { MessageBox.Show("接收数据" + k);

 k++;

 string inputData = serialPort.ReadExisting(); 

try 

{ if (inputData != string.Empty) 

{ if (inputData.Trim().Length == 45)

 { SetText(inputData); 

}

 }

 }

 catch (Exception ex) 

{

 MessageBox.Show(ex.Message);

 } 

} 

//分隔字符串并保存在指定目录下

 private void SetText(string str)

 {

 string aa = str;

 StreamWriter sw = null;

 if (aa != string.Empty) 

{ 

string aaa = aa.Insert(13, ","); 

aaa = aaa.Insert(32, ",");

 String fileName = "C:\\GAJ_PUB\\kaoqin";

 if (Directory.Exists(fileName) == false)

//如果目录不存在 

{ Directory.CreateDirectory(fileName);

//创建目录 sw = File.CreateText("C:\\GAJ_PUB\\kaoqin\\person" + i + ".txt");//创建文本 

} 

else

 { 

sw = File.CreateText("C:\\GAJ_PUB\\kaoqin\\person" + i + ".txt"); 

}

 sw.WriteLine(aaa);

 sw.Flush();

 sw.Close(); 

i++;

 MessageBox.Show("文件已存入指定目录下!!");

 }

 }

 private void button2_Click(object sender, EventArgs e)

 {

 if (threadReceive.ThreadState==ThreadState.Running)

//当前状态为启动线程 

{ threadReceive.Abort(); this.Close();

 } 

else if

 (threadReceive.ThreadState == ThreadState.Suspended)

//当前状态为挂起线程 

{ 

threadReceive.Resume();

 threadReceive.Abort();

 this.Close(); 

} 

else if

 (threadReceive.ThreadState == ThreadState.SuspendRequested)//当前状态为正在挂起线程 

{ 

threadReceive.Resume();

 threadReceive.Abort();

 this.Close();

 } 

else if

 (threadReceive.ThreadState == ThreadState.Unstarted) 

{ 

this.Close();

 }

 } 

private void Form1_FormClosing(object sender, FormClosingEventArgs e) 

{ if (threadReceive.ThreadState == ThreadState.Running)

//当前状态为启动线程 

{

 threadReceive.Abort();

 this.Close(); 

}

 else if(threadReceive.ThreadState == ThreadState.Suspended)

//当前状态为挂起线程

 { 

threadReceive.Resume(); 

threadReceive.Abort();

 this.Close();

 } 

else if

 (threadReceive.ThreadState == ThreadState.SuspendRequested)

//当前状态为正在挂起线程

 { 

threadReceive.Resume(); 

threadReceive.Abort();

 this.Close(); 

}

 }

 }

}