转载于:http://www.cnblogs.com/binfire/archive/2011/10/08/2201973.html
我们知道对于 标准DLL,可以采用DllImport进行调用。例如:
[DllImport("KMY350X.dll")] private static extern int OpenPort(int PortNum, int BaudRate);
如果一些厂家比较懒的话,没有提供相应的dll,我们只能对它进行串口通信编程了。以前从没接触过串口编程,最近在一个项目中有几个地方都需要采用串口通信,跟公司一个老手请教后,感觉学到了很多东西,特在此做个总结:
一:首先我们来认识下什么是串口:
右键 我的电脑-管理-设备管理器-端口,选择一个端口,点击属性。
我们可以看到该串口的属性,在C#中我们使用SerialPort类来表示串口
ConfigClass config = new ConfigClass(); comm.serialPort.PortName = config.ReadConfig("SendHealCard"); //波特率 comm.serialPort.BaudRate = 9600; //数据位 comm.serialPort.DataBits = 8; //两个停止位 comm.serialPort.StopBits = System.IO.Ports.StopBits.One; //无奇偶校验位 comm.serialPort.Parity = System.IO.Ports.Parity.None; comm.serialPort.ReadTimeout = 100; comm.serialPort.WriteTimeout = -1;
二:串口调试工具:
在对串口进行编程时候,我们要向串口发送指令,然后我们解析串口返回的指令。在这里向大家推荐一款工具。
将要发送的指令用空格隔开,选择HEX显示为放回的字符串。
三:正式编程:
编写Comm类:
public class Comm { public delegate void EventHandle(byte[] readBuffer); public event EventHandle DataReceived; public SerialPort serialPort; Thread thread; volatile bool _keepReading; public Comm() { serialPort = new SerialPort(); thread = null; _keepReading = false; } public bool IsOpen { get { return serialPort.IsOpen; } } private void StartReading() { if (!_keepReading) { _keepReading = true; thread = new Thread(new ThreadStart(ReadPort)); thread.Start(); } } private void StopReading() { if (_keepReading) { _keepReading = false; thread.Join(); thread = null; } } private void ReadPort() { while (_keepReading) { if (serialPort.IsOpen) { int count = serialPort.BytesToRead; if (count > 0) { byte[] readBuffer = new byte[count]; try { Application.DoEvents(); serialPort.Read(readBuffer, 0, count); if(DataReceived != null) DataReceived(readBuffer); Thread.Sleep(100); } catch (TimeoutException) { } } } } } public void Open() { Close(); serialPort.Open(); if (serialPort.IsOpen) { StartReading(); } else { MessageBox.Show("串口打开失败!"); } } public void Close() { StopReading(); serialPort.Close(); } public void WritePort(byte[] send, int offSet, int count) { if (IsOpen) { serialPort.Write(send, offSet, count); } } }
注册串口:
Comm comm = new Comm(); ConfigClass config = new ConfigClass(); comm.serialPort.PortName = config.ReadConfig("SendHealCard"); //波特率 comm.serialPort.BaudRate = 9600; //数据位 comm.serialPort.DataBits = 8; //两个停止位 comm.serialPort.StopBits = System.IO.Ports.StopBits.One; //无奇偶校验位 comm.serialPort.Parity = System.IO.Ports.Parity.None; comm.serialPort.ReadTimeout = 100; comm.serialPort.WriteTimeout = -1; comm.Open();
if (comm.IsOpen)
{
comm.DataReceived += new Comm.EventHandle(comm_DataReceived);
}
发送指令:
/// <summary> /// 发卡到机口 /// </summary> private void SendCardToOut() { is_read_card = false; sendCardToOut = true; byte[] send = { 0x02, 0x46, 0x43, 0x34, 0x03, 0x30 }; if (comm.IsOpen) { comm.WritePort(send, 0, send.Length); } }
收到指令,并解析: