基本信息
源码名称：C# 串口通信（SerialPort入门级）
源码大小：0.05M
文件格式：.rar
开发语言：C#
更新时间：2020-08-18
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源码介绍
using System;
using System.IO.Ports;
using System.Windows.Forms;
namespace portApp
{
public partial class Form1 : Form
{
SerialPort sp = null; //声明一个串口类
bool isOpen = false; //打开串口标志位
bool isSetProperty = false; //属性设置标志位
bool isHex = false; //十六进制显示标志位
public Form1()
{
InitializeComponent();
Control.CheckForIllegalCrossThreadCalls = false; //忽略程序跨越线程运行导致的错误
}
private void groupBox2_Enter(object sender, EventArgs e)
{
}
private void label1_Click(object sender, EventArgs e)
{
}
private void groupBox1_Enter(object sender, EventArgs e)
{
}
private void label2_Click(object sender, EventArgs e)
{
}
private void label3_Click(object sender, EventArgs e)
{
}
private void label4_Click(object sender, EventArgs e)
{
}
private void label5_Click(object sender, EventArgs e)
{
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
this.MaximizeBox = false; //窗口的最大化按钮失能
this.MaximumSize = this.Size; //窗口的最大尺寸为当前尺寸
this.MinimumSize = this.Size; //窗口的最小尺寸为当前尺寸
for (int i = 0; i < 25; i )
{
cbxCOMPort.Items.Add("COM" (i 1).ToString()); //ComboBox的Items属性的Add方法，可以添加条目
}
cbxCOMPort.SelectedIndex = 0; //串口号选择的索引为0，即COM1
cbxBaudRate.Items.Add("1200"); //cbxBaudRaud的Items属性的Add方法，可以添加条目
cbxBaudRate.Items.Add("2400");
cbxBaudRate.Items.Add("4800");
cbxBaudRate.Items.Add("9600");
cbxBaudRate.Items.Add("19200");
cbxBaudRate.Items.Add("38400");
cbxBaudRate.Items.Add("115200");
cbxBaudRate.SelectedIndex = 5; //波特率选择的索引为5，即38400波特率
cbxStopBits.Items.Add("0"); //cbxStopBits的Items属性的Add方法，可以添加条目
cbxStopBits.Items.Add("1");
cbxStopBits.Items.Add("1.5");
cbxStopBits.Items.Add("2");
cbxStopBits.SelectedIndex = 0; //停止位选择的索引为0，即0位停止
//列出数据位
cbxDataBits.Items.Add("8");
cbxDataBits.Items.Add("7");
cbxDataBits.Items.Add("6");
cbxDataBits.Items.Add("5");
cbxDataBits.SelectedIndex = 0;
cbxParity.Items.Add("无"); //cbxParity的Items属性的Add方法，可以添加条目
cbxParity.Items.Add("奇校验");
cbxParity.Items.Add("偶校验");
cbxParity.SelectedIndex = 0; //校验选择的索引为0，即无校验
//默认为char显示
rbnChar.Checked = true;
}
private void cbxCOMPort_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void btnCheckCom_Click(object sender, EventArgs e)
{
bool comExistence = false; //有可用串口标志位
cbxCOMPort.Items.Clear(); //清除当前串口号中的所有串口名称
for (int i = 0; i < 25; i )
{
try
{
SerialPort sp = new SerialPort("COM" (i 1).ToString());
sp.Open();
sp.Close();
cbxCOMPort.Items.Add("COM" (i 1).ToString());
comExistence = true;
}
catch (Exception)
{
continue;
}
}
if (comExistence)
{
cbxCOMPort.SelectedIndex = 0;
}
else
{
MessageBox.Show("没有找到可用的串口！", "错误提示");
}
}
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() //检查发送数据是否为空
{
if (tbxSendData.Text.Trim() == "") return false; //发送数据框为空返回false
return true;
}
private void tbxSendData_TextChanged(object sender, EventArgs e)
{
}
private void SetPortProperty() //设置串口的属性
{
sp = new SerialPort();
sp.PortName = cbxCOMPort.Text.Trim(); //设置串口名
sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim()); //设置串口的波特率
if (cbxStopBits.Text.Trim() == "0") //设置停止位
{
sp.StopBits = StopBits.One;
}
else if (cbxStopBits.Text.Trim() == "1.5")
{
sp.StopBits = StopBits.OnePointFive;
}
else if (cbxStopBits.Text.Trim() == "2")
{
sp.StopBits = StopBits.Two;
}
else
{
sp.StopBits = StopBits.One;
}
sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim()); //设置数据位
if (cbxParity.Text.Trim() == "奇校验") //设置校验
{
sp.Parity = Parity.Odd;
}
else if (cbxParity.Text.Trim() == "偶校验")
{
sp.Parity = Parity.Even;
}
else
{
sp.Parity = Parity.None;
}
sp.ReadTimeout = -1; //设置超时读取时间
sp.RtsEnable = true; //定义DataReceived事件，当串口收到数据后触发事件
sp.DataReceived = new SerialDataReceivedEventHandler(sp_DataReceived);
if (rbnHex.Checked)
{
isHex = true;
}
else
{
isHex = false;
}
}
private void button5_Click(object sender, EventArgs e)
{
if (isOpen)
{
try
{
sp.WriteLine(tbxSendData.Text);
}
catch (Exception)
{
MessageBox.Show("发送数据时发生错误！", "错误提示");
return;
}
}
else
{
MessageBox.Show("串口未打开", "错误提示");
return;
}
if (!CheckSendData())
{
MessageBox.Show("请输入要发送的数据！", "错误提示");
return;
}
}
private void btnOpenCom_Click(object sender, EventArgs e)
{
if (isOpen == false)
{
if (!CheckPortSetting()) //检测串口设置
{
MessageBox.Show("串口未设置", "错误提示");
return;
}
if (!isSetProperty)
{
SetPortProperty();
isSetProperty = true;
}
try
{
sp.Open();
isOpen = true;
btnOpenCom.Text = "关闭串口";
//串口打开后，相关的串口设置按钮不可再用
cbxCOMPort.Enabled = false;
cbxBaudRate.Enabled = false;
cbxDataBits.Enabled = false;
cbxStopBits.Enabled = false;
cbxParity.Enabled = false;
rbnChar.Enabled = false;
rbnHex.Enabled = false;
}
catch (Exception)
{
//打开串口失败后，相应标志位取消
isSetProperty = false;
isOpen = false;
MessageBox.Show("串口无效或已被占用", "错误提示");
}
}
else
{
try //打开串口
{
sp.Close();
isOpen = false;
isSetProperty = false;
btnOpenCom.Text = "打开串口";
//关闭串口后，串口设置选项可以继续使用
cbxCOMPort.Enabled = true;
cbxBaudRate.Enabled = true;
cbxDataBits.Enabled = true;
cbxStopBits.Enabled = true;
cbxParity.Enabled = true;
rbnChar.Enabled = true;
rbnHex.Enabled = true;
}
catch (Exception)
{
MessageBox.Show("关闭串口时发生错误", "错误提示");
}
}
}
private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
System.Threading.Thread.Sleep(100); //延时100ms等待接收完数据
//this.Invoke就是跨线程访问ui的方法，也是文本的范例
this.Invoke((EventHandler)delegate
{
if (isHex == false)
{
System.Text.UTF8Encoding utf8 = new System.Text.UTF8Encoding();
Byte[] readBytes = new Byte[sp.BytesToRead];
sp.Read(readBytes, 0, readBytes.Length);
string decodString = utf8.GetString(readBytes);
tbxRecvData.Text = decodString;// sp.ReadLine();
}
else
{
Byte[] ReceivedData = new Byte[sp.BytesToRead];//创建接收字节数组
sp.Read(ReceivedData, 0, ReceivedData.Length);//读取所接收到的数据
String RecvDataText = null;
for (int i = 0; i < ReceivedData.Length; i )
{
RecvDataText = ("0x" ReceivedData[i].ToString("X2") " ");
}
tbxRecvData.Text = RecvDataText;
}
sp.DiscardInBuffer();
});
}
private void button4_Click(object sender, EventArgs e)
{
tbxRecvData.Text = "";
tbxSendData.Text = "";
}
}
}