本文实例讲述了C#串口通信实现方法。分享给大家供大家参考。具体方法如下：
通过COM1发送数据，COM2接收数据。当COM2接收完本次发送的数据后，向COM1发送信息通知COM1本次数据已发完，COM1接到通知后，再发下一段数据。这样可以确保每次发送的数据都可以被正确接收。
代码如下：
复制代码 代码如下:using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
using Utils;
namespace 串口通信
{
public partial class Form1 : Form
{
#region 变量
/// <summary>
/// 启动还是停止，true起动，false停止
/// </summary>
public static bool start = true;
/// <summary>
/// 串口资源
/// </summary>
private static SerialPort serialPort1 = null;
/// <summary>
/// 串口资源
/// </summary>
private static SerialPort serialPort2 = null;
/// <summary>
/// 成功次数
/// </summary>
private static int successCount = 0;
/// <summary>
/// 失败次数
/// </summary>
private static int errorCount = 0;
/// <summary>
/// 上次计算的总次数
/// </summary>
private static int lastCount = 0;
/// <summary>
/// 定时器
/// </summary>
private System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
#endregion
#region Form1
public Form1()
{
InitializeComponent();
}
#endregion
#region Form1_Load
private void Form1_Load(object sender, EventArgs e)
{
serialPort1 = new SerialPort("COM1");
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived1);
serialPort1.Open();
serialPort2 = new SerialPort("COM2");
serialPort2.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived2);
serialPort2.Open();
}
#endregion
#region Form1_FormClosed
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
serialPort1.Close();
serialPort1.Dispose();
serialPort2.Close();
serialPort2.Dispose();
}
#endregion
#region btnStart_Click
private void btnStart_Click(object sender, EventArgs e)
{
start = true;
SendData();
timer.Interval = 500;
timer.Tick += new EventHandler(delegate(object obj, EventArgs eventArgs)
{
if (lastCount == 0)
{
lastCount = successCount + errorCount;
}
else
{
int cnt = successCount + errorCount - lastCount;
cnt = Data.Length * cnt / 1024 * (1000 / timer.Interval);
double total = (successCount + errorCount) * Data.Length / 1024.0;
InvokeDelegate invokeDelegate = delegate()
{
label3.Text = cnt.ToString() + "KB/S " + total.ToString("#.0") + "KB";
};
InvokeUtil.Invoke(this, invokeDelegate);
lastCount = successCount + errorCount;
}
});
timer.Start();
}
#endregion
#region btnStop_Click
private void btnStop_Click(object sender, EventArgs e)
{
start = false;
timer.Stop();
timer.Dispose();
timer = new System.Windows.Forms.Timer();
}
#endregion
#region 接收串口数据事件
/// <summary>
/// 接收串口数据事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void serialPort_DataReceived1(object sender, SerialDataReceivedEventArgs e)
{
if (serialPort1.ReadLine() != null)
{
successCount++;
SendData();
}
}
/// <summary>
/// 接收串口数据事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void serialPort_DataReceived2(object sender, SerialDataReceivedEventArgs e)
{
List<byte> bList = new List<byte>();
int i = 0;
while (serialPort2.BytesToRead > 0)
{
byte[] bArr = new byte[serialPort2.BytesToRead];
i += serialPort2.Read(bArr, 0, bArr.Length);
bList.AddRange(bArr);
}
serialPort2.WriteLine("success");
string s = ASCIIEncoding.UTF8.GetString(bList.ToArray());
InvokeDelegate invokeDelegate = delegate()
{
textBox2.Text = s;
};
InvokeUtil.Invoke(this, invokeDelegate);
if (s != Str)
{
errorCount++;
invokeDelegate = delegate()
{
label2.Text = errorCount + "次不相等(失败)";
};
InvokeUtil.Invoke(this, invokeDelegate);
}
else
{
invokeDelegate = delegate()
{
label1.Text = successCount + "次相等(成功)";
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
#endregion
#region 发送数据
private void SendData()
{
if (start)
{
Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)
{
InvokeDelegate invokeDelegate = delegate()
{
textBox1.Text = Str;
};
InvokeUtil.Invoke(this, invokeDelegate);
serialPort1.Write(Data, 0, Data.Length);
}));
thread.Start();
}
}
#endregion
#region 数据
private static byte[] data = null;
/// <summary>
/// 数据
/// </summary>
private static byte[] Data
{
get
{
if (data == null)
{
data = ASCIIEncoding.UTF8.GetBytes(Str);
}
return data;
}
}
#endregion
#region 获取字符串
private static string str = null;
/// <summary>
/// 字符串
/// </summary>
private static string Str
{
get
{
if (str == null)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 270; i++)
{
sb.Append("计算机程序");
}
str = sb.ToString();
}
return str;
}
}
#endregion
}
}
辅助代码如下：
复制代码 代码如下:using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
namespace Utils
{
/// <summary>
/// 跨线程访问控件的委托
/// </summary>
public delegate void InvokeDelegate();
/// <summary>
/// 跨线程访问控件类
/// </summary>
public class InvokeUtil
{
/// <summary>
/// 跨线程访问控件
/// </summary>
/// <param name="ctrl">Form对象</param>
/// <param name="de">委托</param>
public static void Invoke(Control ctrl, Delegate de)
{
if (ctrl.IsHandleCreated)
{
ctrl.BeginInvoke(de);
}
}
}
}
复制代码 代码如下:using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Win32;
using System.Security.Permissions;
using System.IO.Ports;
using System.Security;
namespace Utils
{
/// <summary>
/// 串口资源工具类
/// </summary>
public class SerialPortUtil
{
#region 获取本机串口列表，包括虚拟串口
/// <summary>
/// 获取本机串口列表，包括虚拟串口
/// </summary>
public static string[] GetCOMList()
{
List<string> list = new List<string>();
foreach (string portName in SerialPort.GetPortNames())
{
list.Add(portName);
}
return list.ToArray();
}
#endregion
#region 从注册表获取本机串口列表
/// <summary>
/// 从注册表获取本机串口列表
/// </summary>
public static string[] GetPortNames()
{
RegistryKey localMachine = null;
RegistryKey key2 = null;
string[] textArray = null;
//这里有个断言，判断该注册表项是否存在
new RegistryPermission(RegistryPermissionAccess.Read, @"HKEY_LOCAL_MACHINEHARDWAREDEVICEMAPSERIALCOMM").Assert();
try
{
localMachine = Registry.LocalMachine;
key2 = localMachine.OpenSubKey(@"HARDWAREDEVICEMAPSERIALCOMM", false);
if (key2 != null)
{
string[] valueNames = key2.GetValueNames();
textArray = new string[valueNames.Length];
for (int i = 0; i < valueNames.Length; i++)
{
textArray[i] = (string)key2.GetValue(valueNames[i]);
}
}
}
finally
{
if (localMachine != null)
{
localMachine.Close();
}
if (key2 != null)
{
key2.Close();
}
CodeAccessPermission.RevertAssert();
}
if (textArray == null)
{
textArray = new string[0];
}
return textArray;
}
#endregion
}
}
希望本文所述对大家的C#程序设计有所帮助。