C# 串口通信程序

主要程序：

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;

namespace SerialComMaster

{

public partial class MainFrm : Form

{

SerialPort sp = null;

bool isOpen = false;

bool isSetProperty = false;

public MainFrm()

{

InitializeComponent();

}

private void MainFrm_Load(object sender, EventArgs e)

{

this.MaximumSize = this.Size;
this.MinimumSize = this.Size;

this.MaximizeBox = false;

for (int i = 0; i < 256; i++)

{

cbxCOMPort.Items.Add("COM" + (i+1).ToString());

}

cbxCOMPort.SelectedIndex=0;

//列出常用的波特率

cbxBaudRate.Items.Add("300");

cbxBaudRate.Items.Add("600");

cbxBaudRate.Items.Add("1200");

cbxBaudRate.Items.Add("2400");

cbxBaudRate.Items.Add("4800");

cbxBaudRate.Items.Add("9600");

cbxBaudRate.Items.Add("19200");

cbxBaudRate.Items.Add("38400");

cbxBaudRate.Items.Add("43000");

cbxBaudRate.Items.Add("56000");

cbxBaudRate.Items.Add("57600");

cbxBaudRate.Items.Add("115200");

cbxBaudRate.SelectedIndex=5;

//列出停止位

cbxStopBits.Items.Add("0");

cbxStopBits.Items.Add("1");

cbxStopBits.Items.Add("1.5");

cbxStopBits.Items.Add("2");

cbxStopBits.SelectedIndex=1;

//列出数据位

cbxDataBits.Items.Add("8");

cbxDataBits.Items.Add("7");

cbxDataBits.Items.Add("6");

cbxDataBits.Items.Add("5");

cbxDataBits.SelectedIndex=0;

//列出奇偶校验位

cbxParity.Items.Add("无");

cbxParity.Items.Add("奇校验"); 
cbxParity.Items.Add("偶校验");

cbxParity.SelectedIndex=0;

}

private void btnCheckCOM_Click(object sender, EventArgs e)

{//检测哪些串口可用

cbxCOMPort.Items.Clear();

for (int i = 0; i < 256; i++)

{

try

{

SerialPort sp = new SerialPort("COM" + (i + 1).ToString());

sp.Open();

sp.Close();

cbxCOMPort.Items.Add("COM" + (i + 1).ToString());

}

catch (Exception)

{

lblStatus.Text = "COM" + (i + 1).ToString() + "不可用";

continue;

}

}

}

private bool CheckPortSetting()

{//检查串口是否设置

if (cbxCOMPort.Text.Trim() == "") return false;

if (cbxBaudRate.Text.Trim() == "") return false;

if (cbxDataBits.Text.Trim() == "") return false;

if (cbxParity.Text.Trim() == "") return false;

if (cbxStopBits.Text.Trim() == "") return false;

return true;

}

private bool CheckSendData()

{

if (tbxSendData.Text.Trim() == "") return false;

return true;

}

private void SetPortProperty()

{//设置串口的属性

sp = new SerialPort();

sp.PortName = cbxCOMPort.Text.Trim();//设置串口名

//设置串口的波特率

sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim());

//设置停止位

float f = Convert.ToSingle(cbxStopBits.Text.Trim());

if (f == 0)

{

sp.StopBits = StopBits.None;

}

else if (f == 1.5)

{

sp.StopBits = StopBits.OnePointFive;

}

else if (f == 1)

{

sp.StopBits = StopBits.One;

}

else if (f == 2)

{

sp.StopBits = StopBits.Two;

}

else

{

sp.StopBits = StopBits.One;

}

//设置数据位

sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim());

//设置奇偶校验位

string s = cbxParity.Text.Trim();

if (s.CompareTo("无") == 0) 
{

sp.Parity = Parity.None;

}

else if (s.CompareTo("奇校验") == 0)

{

sp.Parity = Parity.Odd;

}

else if (s.CompareTo("偶校验") == 0)

{

sp.Parity = Parity.Even;

}

else

{

sp.Parity = Parity.None;

}

//设置超时读取时间

sp.ReadTimeout = -1;

//打开串口

try

{

sp.Open();

isOpen = true;

}

catch (Exception)

{

lblStatus.Text = "打开串口时发生错误";

}

}

private void btnSend_Click(object sender, EventArgs e)

{//发送串口数据

if (!CheckPortSetting())

{

MessageBox.Show("串口未设置！", "错误提示");

return;

} 
if (!CheckSendData())

{

MessageBox.Show("请输入要发送的数据！", "错误提示");

return;

}

if (!isSetProperty)

{

SetPortProperty();

isSetProperty = true;

}

if (isOpen)

{//写串口数据

try

{

sp.WriteLine(tbxSendData.Text);

}

catch (Exception)

{

lblStatus.Text = "发送数据时发生错误！";

return;

}

}

else

{

MessageBox.Show("串口未打开！", "错误提示");

return;

}

tbxSendData.Text = "";

}

private void btnExit_Click(object sender, EventArgs e)

{

sp.Close();

this.Close();

}

private void btnRecvData_Click(object sender, EventArgs e)

{

if (isOpen)

{

try

{//读取串口数据

tbxRecvData.Text += sp.ReadLine();

}

catch (Exception)

{

lblStatus.Text = "读取串口时发生错误！";

return;

}

}

else

{

MessageBox.Show("串口未打开！", "错误提示");

return;

}

}

}

}