C#的串口通信程序

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;

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;

cbxStopBits.Items.Add("0");
cbxStopBits.Items.Add("1");
cbxStopBits.Items.Add("1.5");
cbxStopBits.Items.Add("2");
cbxStopBits.SelectedIndex=1;

cbxDataBits.Items.Add("8");
cbxDataBits.Items.Add("7");
cbxDataBits.Items.Add("6");
cbxDataBits.Items.Add("5");
cbxDataBits.SelectedIndex=0;

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)
{
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()
{
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()
{
sp = new SerialPort();
sp.PortName = cbxCOMPort.Text.Trim();
sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim());

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;
}

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

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;
}

sp.ReadTimeout = -1;

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)
{
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)
{
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
{
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;
}
}
}
}