SerialPort

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 TestSerialPort 
 { 
     public partial class frmTESTSerialPort : Form 
     { 
         public frmTESTSerialPort() 
         { 
             InitializeComponent(); 
             Control.CheckForIllegalCrossThreadCalls = false; 
         } 
         private Button button1; 
         private TextBox txtSend; 
         private TextBox txtReceive; 
         private Label label1; 
         private Label label2; 
         /// <summary> 
         /// 必需的设计器变量。 
         /// </summary> 
         private System.ComponentModel.IContainer components = null; 
         /// <summary> 
         /// 清理所有正在使用的资源。 
         /// </summary> 
         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> 
         protected override void Dispose(bool disposing) 
         { 
             if (disposing && (components != null)) 
             { 
                 components.Dispose(); 
             } 
             base.Dispose(disposing); 
         } 
         #region Windows 窗体设计器生成的代码 
         /// <summary> 
         /// 设计器支持所需的方法 - 不要 
         /// 使用代码编辑器修改此方法的内容。 
         /// </summary> 
         private void InitializeComponent() 
         { 
             this.button1 = new System.Windows.Forms.Button(); 
             this.txtSend = new System.Windows.Forms.TextBox(); 
             this.txtReceive = new System.Windows.Forms.TextBox(); 
             this.label1 = new System.Windows.Forms.Label(); 
             this.label2 = new System.Windows.Forms.Label(); 
             this.SuspendLayout(); 
             // 
             // button1 
             // 
             this.button1.Location = new System.Drawing.Point(440, 379); 
             this.button1.Name = "button1"; 
             this.button1.Size = new System.Drawing.Size(75, 23); 
             this.button1.TabIndex = 0; 
             this.button1.Text = "发送"; 
             this.button1.UseVisualStyleBackColor = true; 
             this.button1.Click += new System.EventHandler(this.button1_Click); 
             // 
             // txtSend 
             // 
             this.txtSend.Location = new System.Drawing.Point(59, 12); 
             this.txtSend.Multiline = true; 
             this.txtSend.Name = "txtSend"; 
             this.txtSend.Size = new System.Drawing.Size(456, 164); 
             this.txtSend.TabIndex = 2; 
             // 
             // txtReceive 
             // 
             this.txtReceive.Location = new System.Drawing.Point(59, 200); 
             this.txtReceive.Multiline = true; 
             this.txtReceive.Name = "txtReceive"; 
             this.txtReceive.Size = new System.Drawing.Size(456, 164); 
             this.txtReceive.TabIndex = 2; 
             // 
             // label1 
             // 
             this.label1.Location = new System.Drawing.Point(13, 15); 
             this.label1.Name = "label1"; 
             this.label1.Size = new System.Drawing.Size(41, 12); 
             this.label1.TabIndex = 0; 
             this.label1.Text = "发送"; 
             // 
             // label2 
             // 
             this.label2.Location = new System.Drawing.Point(13, 213); 
             this.label2.Name = "label2"; 
             this.label2.Size = new System.Drawing.Size(41, 12); 
             this.label2.TabIndex = 0; 
             this.label2.Text = "接收"; 
             // 
             // frmTESTSerialPort 
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
             this.ClientSize = new System.Drawing.Size(546, 434); 
             this.Controls.Add(this.label2); 
             this.Controls.Add(this.label1); 
             this.Controls.Add(this.txtReceive); 
             this.Controls.Add(this.txtSend); 
             this.Controls.Add(this.button1); 
             this.Name = "frmTESTSerialPort"; 
             this.Text = "串口试验"; 
             this.ResumeLayout(false); 
             this.PerformLayout(); 
         } 
         #endregion 
 private void button1_Click(object sender, EventArgs e) 
         { 
             //实例化串口对象(默认：COMM1,9600,e,8,1)             
             SerialPort serialPort1 = new SerialPort(); 
             //更改参数 
             serialPort1.PortName = "COM1"; 
             serialPort1.BaudRate = 19200; 
             serialPort1.Parity = Parity.Odd; 
             serialPort1.StopBits = StopBits.Two; 
             //上述步骤可以用在实例化时调用SerialPort类的重载构造函数 
             //SerialPort serialPort = new SerialPort("COM1", 19200, Parity.Odd, StopBits.Two); 
             //打开串口(打开串口后不能修改端口名,波特率等参数,修改参数要在串口关闭后修改) 
             serialPort1.Open(); 
             //发送数据 
             SendStringData(serialPort1); 
             //也可用字节的形式发送数据 
             //SendBytesData(serialPort1); 
              
             //开启接收数据线程 
             ReceiveData(serialPort1); 
              
         } 
          
         //发送字符串数据 
         private void SendStringData(SerialPort serialPort) 
         { 
             serialPort.Write(txtSend.Text); 
         } 
         /// <summary> 
         /// 开启接收数据线程 
         /// </summary> 
         private void ReceiveData(SerialPort serialPort) 
         { 
             //同步阻塞接收数据线程 
             Thread threadReceive=new Thread(new ParameterizedThreadStart(SynReceiveData)); 
             threadReceive.Start(serialPort); 
              
              //也可用异步接收数据线程 
             //Thread threadReceiveSub = new Thread(new ParameterizedThreadStart(AsyReceiveData)); 
             //threadReceiveSub.Start(serialPort); 
              
         } 
         //发送二进制数据 
         private void SendBytesData(SerialPort serialPort) 
         { 
             byte[] bytesSend=System.Text.Encoding.Default.GetBytes(txtSend.Text ); 
             serialPort.Write(bytesSend, 0, bytesSend.Length); 
         } 
         //同步阻塞读取 
         private void SynReceiveData(object serialPortobj) 
         { 
             SerialPort serialPort = (SerialPort)serialPortobj; 
             System.Threading.Thread.Sleep(0); 
             serialPort.ReadTimeout = 1000; 
             try 
             { 
                 //阻塞到读取数据或超时(这里为2秒) 
                 byte firstByte=Convert.ToByte(serialPort.ReadByte()); 
                 int bytesRead=serialPort.BytesToRead ;                
                 byte[] bytesData=new byte[bytesRead+1]; 
                 bytesData[0] = firstByte; 
                 for (int i = 1; i <=bytesRead; i++) 
                     bytesData = Convert.ToByte( serialPort.ReadByte()); 
                 txtReceive.Text = System.Text.Encoding.Default.GetString(bytesData); 
             } 
             catch(Exception e) 
             { 
                 MessageBox.Show(e.Message); 
                 //处理超时错误 
             } 
              
             serialPort.Close(); 
         } 
         //异步读取 
         private void AsyReceiveData(object serialPortobj) 
         { 
             SerialPort serialPort = (SerialPort)serialPortobj; 
             System.Threading.Thread.Sleep(500); 
             try 
             { 
                  txtReceive.Text =   serialPort.ReadExisting(); 
             } 
             catch (Exception e) 
             { 
                 MessageBox.Show(e.Message); 
                 //处理错误 
             } 
             serialPort.Close(); 
         } 
     } 
  
     static class Program 
     { 
         /// <summary> 
         /// 应用程序的主入口点。 
         /// </summary> 
         [STAThread] 
         static void Main() 
         { 
             Application.EnableVisualStyles(); 
             Application.SetCompatibleTextRenderingDefault(false); 
             Application.Run(new frmTESTSerialPort()); 
         } 
     } 
 }