form1.cs

在win 4.2中用 C# 实现串口通讯

			ctoCommPort.ReadIntervalTimeout = Int32.MaxValue; 
			ctoCommPort.ReadTotalTimeoutConstant = 0; 
			ctoCommPort.ReadTotalTimeoutMultiplier = 0; 
			ctoCommPort.WriteTotalTimeoutMultiplier = 10; 
			ctoCommPort.WriteTotalTimeoutConstant = 1000; 
			SetCommTimeouts(hComm,ref ctoCommPort); 

			// SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS. 
			// THERE ARE OTHER WAYS OF DOING SETTING THESE BUT THIS IS THE EASIEST. 
			// IF YOU WANT TO LATER ADD CODE FOR OTHER BAUD RATES, REMEMBER 
			// THAT THE ARGUMENT FOR BuildCommDCB MUST BE A POINTER TO A STRING. 
			// ALSO NOTE THAT BuildCommDCB() DEFAULTS TO NO HANDSHAKING. 
			DCB dcbCommPort = new DCB(); 
			dcbCommPort.DCBlength = Marshal.SizeOf(dcbCommPort); 
			GetCommState(hComm, ref dcbCommPort); 
			dcbCommPort.BaudRate = baudRate; 
			dcbCommPort.Parity = parity; 
			dcbCommPort.ByteSize = byteSize; 
			dcbCommPort.StopBits = stopBits; 
			SetCommState(hComm, ref dcbCommPort); 

			PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT); 
			PurgeComm(hComm, PURGE_TXCLEAR | PURGE_TXABORT); 

			bOpened = true; 
			return true; 
		} 

		// 关闭串口 
		public bool ClosePort() 
		{ 
			if (hComm == INVALID_HANDLE_VALUE) 
			{ 
				return false; 
			} 

			if (CloseHandle(hComm)) 
			{ 
				hComm = INVALID_HANDLE_VALUE; 
				bOpened = false; 
				return true; 
			} 
			else 
			{ 
				return false; 
			} 
		} 

		// 往串口写数据 
		public bool WritePort(byte[] WriteBytes) 
		{ 
			if (hComm == INVALID_HANDLE_VALUE) 
			{ 
				return false; 
			} 

			COMSTAT ComStat = new COMSTAT(); 
			int dwErrorFlags = 0; 

			ClearCommError(hComm, ref dwErrorFlags, ref ComStat); 
			if (dwErrorFlags != 0) 
				PurgeComm(hComm, PURGE_TXCLEAR | PURGE_TXABORT); 

			OVERLAPPED ovlCommPort = new OVERLAPPED(); 
			int BytesWritten = 0; 
			return WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort); 
		} 

		// 从串口读数据 
		public int ReadPort(int NumBytes, byte[] commRead) 
		{ 
			if (hComm == INVALID_HANDLE_VALUE) 
			{ 
				return 0; 
			} 

			COMSTAT ComStat = new COMSTAT(); 
			int dwErrorFlags = 0; 

			ClearCommError(hComm, ref dwErrorFlags, ref ComStat); 
			if (dwErrorFlags != 0) 
			{
				PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT); 
			}

			if (ComStat.cbInQue > 0) 
			{ 
				OVERLAPPED ovlCommPort = new OVERLAPPED(); 
				int BytesRead = 0; 
				ReadFile(hComm, commRead, NumBytes, ref BytesRead, ref ovlCommPort); 
				return BytesRead;
			} 
			else 
			{ 
				return 0; 
			} 
		} 
	} 
} 


namespace SmartDeviceApplication__SerialPort
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem menuItem2;
		private System.Windows.Forms.MainMenu mainMenu1;

		private SerialAPI.SerialPort Serial=new SerialAPI.SerialPort();

		bool PortOpen=false;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Button btnSend;
		private System.Windows.Forms.TextBox txtReceive;
		private System.Windows.Forms.Button btnOpen;
		private System.Windows.Forms.TextBox txtSend;
		bool Receive=false;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}
		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			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.mainMenu1 = new System.Windows.Forms.MainMenu();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.menuItem2 = new System.Windows.Forms.MenuItem();
			this.btnSend = new System.Windows.Forms.Button();
			this.txtReceive = new System.Windows.Forms.TextBox();
			this.btnOpen = new System.Windows.Forms.Button();
			this.txtSend = new System.Windows.Forms.TextBox();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			// 
			// mainMenu1
			// 
			this.mainMenu1.MenuItems.Add(this.menuItem1);
			// 
			// menuItem1
			// 
			this.menuItem1.MenuItems.Add(this.menuItem2);
			this.menuItem1.Text = "操作";
			// 
			// menuItem2
			// 
			this.menuItem2.Text = "退出";
			this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
			// 
			// btnSend
			// 
			this.btnSend.Location = new System.Drawing.Point(232, 296);
			this.btnSend.Size = new System.Drawing.Size(72, 24);
			this.btnSend.Text = "发送";
			this.btnSend.Click += new System.EventHandler(this.button1_Click);
			// 
			// txtReceive
			// 
			this.txtReceive.Location = new System.Drawing.Point(128, 88);
			this.txtReceive.Multiline = true;
			this.txtReceive.Size = new System.Drawing.Size(192, 144);
			this.txtReceive.Text = "";
			// 
			// btnOpen
			// 
			this.btnOpen.Location = new System.Drawing.Point(144, 296);
			this.btnOpen.Size = new System.Drawing.Size(72, 24);
			this.btnOpen.Text = "打开";
			this.btnOpen.Click += new System.EventHandler(this.button2_Click);
			// 
			// txtSend
			// 
			this.txtSend.Location = new System.Drawing.Point(128, 256);
			this.txtSend.Size = new System.Drawing.Size(192, 21);
			this.txtSend.Text = "";
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(128, 64);
			this.label1.Size = new System.Drawing.Size(72, 16);
			this.label1.Text = "接收区";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(128, 240);
			this.label2.Size = new System.Drawing.Size(64, 16);
			this.label2.Text = "发送区";
			// 
			// Form1
			// 
			this.ClientSize = new System.Drawing.Size(634, 464);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.txtSend);
			this.Controls.Add(this.btnOpen);
			this.Controls.Add(this.txtReceive);
			this.Controls.Add(this.btnSend);
			this.Menu = this.mainMenu1;
			this.Text = "串口通讯";
			this.Load += new System.EventHandler(this.Form1_Load);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>

		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void menuItem2_Click(object sender, System.EventArgs e)
		{
			Receive=false;
			Serial.ClosePort();

			this.Close();
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			bool flag = false;
			if(txtSend.TextLength==0)
			{
				return;
			}
			byte[] buf;
			buf=new byte [txtSend.TextLength];
			for(int i=0;i<txtSend.TextLength;i++)
			{
				buf[i]=Convert.ToByte(txtSend.Text[i]);
			}
			flag = Serial.WritePort(buf);
			if(flag)
			{
				MessageBox.Show("发送成功！","提示");
			}
			else
			{
				MessageBox.Show("发送失败！","提示");

			}
		}

		private void button2_Click(object sender, System.EventArgs e)
		{

			if(!PortOpen)
			{
				if(Serial.OpenPort("COM1:",9600,0,8,1))
				{
					PortOpen=true;
					Receive=true;
					ThreadPool.QueueUserWorkItem(new WaitCallback(SerialReceive),0); 
					btnOpen.Text="关闭";
				}
			}
			else
			{
				Receive=false;
				Serial.ClosePort();
				PortOpen=false;
				btnOpen.Text="打开";
			}
		
		}

		public void SerialReceive(Object a)
		{
			byte [] buf;
			buf=new byte [1];
			int bytesRead=0;
			int i;

			while(Receive)
			{
				if(Serial.Opened)
				{
					bytesRead=Serial.ReadPort(1,buf);
					if(bytesRead>0)
					{
						for(i=0;i<bytesRead;i++)
						{
							txtReceive.Text+=Convert.ToChar(buf[i]).ToString();
						}
					}
				
				}
			}
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
		
		}

	}
}