做企业的网站都要准备什么东西,网站开发建设总结,网站如何屏蔽中国ip,制作免费企业宣传视频本文通过实例讲解C#串口通信。
入门实例设计一个串口助手#xff0c;能够很好的涵盖串口要点的使用。
目录
一、成品图 二、界面文件
三、后台代码
四、实例中要点 一、成品图
如下#xff1a; 实现的过程
创建winform项目#xff0c;将Form1文件的名称改为MainForm能够很好的涵盖串口要点的使用。
目录
一、成品图 二、界面文件
三、后台代码
四、实例中要点 一、成品图
如下 实现的过程
创建winform项目将Form1文件的名称改为MainForm在主窗体中添加文本控件选框控件按钮等控件。以及SerialPort控件该控件不在窗体中显示。
给控件更改名称
所有控件可以从文件大纲里面查看 设置控件的属性添加事件。
SerialPort控件的属性如下把读写的超时时间由默认-1改为1000。 二、界面文件 MainForm.Designer.cs
namespace SerialPortDemo
{partial class MainForm{/// summary/// 必需的设计器变量。/// /summaryprivate System.ComponentModel.IContainer components null;/// summary/// 清理所有正在使用的资源。/// /summary/// param namedisposing如果应释放托管资源为 true否则为 false。/paramprotected override void Dispose(bool disposing){if (disposing (components ! null)){components.Dispose();}base.Dispose(disposing);}#region Windows 窗体设计器生成的代码/// summary/// 设计器支持所需的方法 - 不要修改/// 使用代码编辑器修改此方法的内容。/// /summaryprivate void InitializeComponent(){this.components new System.ComponentModel.Container();System.ComponentModel.ComponentResourceManager resources new System.ComponentModel.ComponentResourceManager(typeof(MainForm));this.groupBox1 new System.Windows.Forms.GroupBox();this.btnOpen new System.Windows.Forms.Button();this.cmbParity new System.Windows.Forms.ComboBox();this.cmbDataBits new System.Windows.Forms.ComboBox();this.cmbStopBits new System.Windows.Forms.ComboBox();this.cmbBaudRate new System.Windows.Forms.ComboBox();this.cmbPortName new System.Windows.Forms.ComboBox();this.label5 new System.Windows.Forms.Label();this.label4 new System.Windows.Forms.Label();this.label3 new System.Windows.Forms.Label();this.label2 new System.Windows.Forms.Label();this.label1 new System.Windows.Forms.Label();this.spt new System.IO.Ports.SerialPort(this.components);this.txtRead new System.Windows.Forms.TextBox();this.chk16Read new System.Windows.Forms.CheckBox();this.btnClearRead new System.Windows.Forms.Button();this.btnSend new System.Windows.Forms.Button();this.btnClearWrite new System.Windows.Forms.Button();this.chk16Write new System.Windows.Forms.CheckBox();this.txtWrite new System.Windows.Forms.TextBox();this.groupBox2 new System.Windows.Forms.GroupBox();this.groupBox3 new System.Windows.Forms.GroupBox();this.label6 new System.Windows.Forms.Label();this.chkReadAutoWrap new System.Windows.Forms.CheckBox();this.chkWriteAutoWrap new System.Windows.Forms.CheckBox();this.groupBox1.SuspendLayout();this.groupBox2.SuspendLayout();this.groupBox3.SuspendLayout();this.SuspendLayout();// // groupBox1// this.groupBox1.Controls.Add(this.btnOpen);this.groupBox1.Controls.Add(this.cmbParity);this.groupBox1.Controls.Add(this.cmbDataBits);this.groupBox1.Controls.Add(this.cmbStopBits);this.groupBox1.Controls.Add(this.cmbBaudRate);this.groupBox1.Controls.Add(this.cmbPortName);this.groupBox1.Controls.Add(this.label5);this.groupBox1.Controls.Add(this.label4);this.groupBox1.Controls.Add(this.label3);this.groupBox1.Controls.Add(this.label2);this.groupBox1.Controls.Add(this.label1);this.groupBox1.Location new System.Drawing.Point(10, 13);this.groupBox1.Margin new System.Windows.Forms.Padding(4);this.groupBox1.Name groupBox1;this.groupBox1.Padding new System.Windows.Forms.Padding(4);this.groupBox1.Size new System.Drawing.Size(212, 242);this.groupBox1.TabIndex 0;this.groupBox1.TabStop false;this.groupBox1.Text 串口配置;// // btnOpen// this.btnOpen.Font new System.Drawing.Font(微软雅黑, 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnOpen.Location new System.Drawing.Point(11, 203);this.btnOpen.Margin new System.Windows.Forms.Padding(0);this.btnOpen.Name btnOpen;this.btnOpen.Size new System.Drawing.Size(187, 35);this.btnOpen.TabIndex 11;this.btnOpen.Text 打开串口;this.btnOpen.UseVisualStyleBackColor true;this.btnOpen.Click new System.EventHandler(this.btnOpen_Click);// // cmbParity// this.cmbParity.FormattingEnabled true;this.cmbParity.Items.AddRange(new object[] {无,奇校验,偶校验});this.cmbParity.Location new System.Drawing.Point(79, 167);this.cmbParity.Margin new System.Windows.Forms.Padding(4);this.cmbParity.Name cmbParity;this.cmbParity.Size new System.Drawing.Size(117, 23);this.cmbParity.TabIndex 10;// // cmbDataBits// this.cmbDataBits.FormattingEnabled true;this.cmbDataBits.Items.AddRange(new object[] {8,7,6,5});this.cmbDataBits.Location new System.Drawing.Point(79, 135);this.cmbDataBits.Margin new System.Windows.Forms.Padding(4);this.cmbDataBits.Name cmbDataBits;this.cmbDataBits.Size new System.Drawing.Size(117, 23);this.cmbDataBits.TabIndex 9;// // cmbStopBits// this.cmbStopBits.FormattingEnabled true;this.cmbStopBits.Items.AddRange(new object[] {1,1.5,2});this.cmbStopBits.Location new System.Drawing.Point(79, 103);this.cmbStopBits.Margin new System.Windows.Forms.Padding(4);this.cmbStopBits.Name cmbStopBits;this.cmbStopBits.Size new System.Drawing.Size(117, 23);this.cmbStopBits.TabIndex 8;// // cmbBaudRate// this.cmbBaudRate.FormattingEnabled true;this.cmbBaudRate.Items.AddRange(new object[] {1382400,921600,460800,256000,230400,128000,115200,76800,57600,43000,38400,19200,14400,9600,4800,1200});this.cmbBaudRate.Location new System.Drawing.Point(79, 69);this.cmbBaudRate.Margin new System.Windows.Forms.Padding(4);this.cmbBaudRate.Name cmbBaudRate;this.cmbBaudRate.Size new System.Drawing.Size(117, 23);this.cmbBaudRate.TabIndex 7;// // cmbPortName// this.cmbPortName.FormattingEnabled true;this.cmbPortName.Location new System.Drawing.Point(79, 38);this.cmbPortName.Margin new System.Windows.Forms.Padding(4);this.cmbPortName.Name cmbPortName;this.cmbPortName.Size new System.Drawing.Size(117, 23);this.cmbPortName.TabIndex 6;// // label5// this.label5.AutoSize true;this.label5.Location new System.Drawing.Point(8, 170);this.label5.Margin new System.Windows.Forms.Padding(4, 0, 4, 0);this.label5.Name label5;this.label5.Size new System.Drawing.Size(60, 15);this.label5.TabIndex 4;this.label5.Text 校验位:;// // label4// this.label4.AutoSize true;this.label4.Location new System.Drawing.Point(8, 106);this.label4.Margin new System.Windows.Forms.Padding(4, 0, 4, 0);this.label4.Name label4;this.label4.Size new System.Drawing.Size(60, 15);this.label4.TabIndex 3;this.label4.Text 停止位:;// // label3// this.label3.AutoSize true;this.label3.Location new System.Drawing.Point(8, 138);this.label3.Margin new System.Windows.Forms.Padding(4, 0, 4, 0);this.label3.Name label3;this.label3.Size new System.Drawing.Size(60, 15);this.label3.TabIndex 2;this.label3.Text 数据位:;// // label2// this.label2.AutoSize true;this.label2.Location new System.Drawing.Point(8, 72);this.label2.Margin new System.Windows.Forms.Padding(4, 0, 4, 0);this.label2.Name label2;this.label2.Size new System.Drawing.Size(60, 15);this.label2.TabIndex 1;this.label2.Text 波特率:;// // label1// this.label1.AutoSize true;this.label1.Location new System.Drawing.Point(8, 41);this.label1.Margin new System.Windows.Forms.Padding(4, 0, 4, 0);this.label1.Name label1;this.label1.Size new System.Drawing.Size(60, 15);this.label1.TabIndex 0;this.label1.Text 端口号:;// // spt// this.spt.ReadTimeout 1000;this.spt.WriteTimeout 1000;this.spt.DataReceived new System.IO.Ports.SerialDataReceivedEventHandler(this.spt_DataReceived);// // txtRead// this.txtRead.BackColor System.Drawing.Color.White;this.txtRead.ForeColor System.Drawing.Color.Black;this.txtRead.Location new System.Drawing.Point(244, 38);this.txtRead.Margin new System.Windows.Forms.Padding(4);this.txtRead.Multiline true;this.txtRead.Name txtRead;this.txtRead.ScrollBars System.Windows.Forms.ScrollBars.Vertical;this.txtRead.Size new System.Drawing.Size(652, 280);this.txtRead.TabIndex 1;// // chk16Read// this.chk16Read.AutoSize true;this.chk16Read.Location new System.Drawing.Point(28, 38);this.chk16Read.Margin new System.Windows.Forms.Padding(4);this.chk16Read.Name chk16Read;this.chk16Read.Size new System.Drawing.Size(105, 19);this.chk16Read.TabIndex 2;this.chk16Read.Text 16进制接收;this.chk16Read.UseVisualStyleBackColor true;// // btnClearRead// this.btnClearRead.Font new System.Drawing.Font(微软雅黑, 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnClearRead.Location new System.Drawing.Point(244, 324);this.btnClearRead.Margin new System.Windows.Forms.Padding(0);this.btnClearRead.Name btnClearRead;this.btnClearRead.Size new System.Drawing.Size(120, 35);this.btnClearRead.TabIndex 3;this.btnClearRead.Text 清除接收;this.btnClearRead.UseVisualStyleBackColor true;this.btnClearRead.Click new System.EventHandler(this.btnClearRead_Click);// // btnSend// this.btnSend.Font new System.Drawing.Font(微软雅黑, 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnSend.Location new System.Drawing.Point(780, 543);this.btnSend.Margin new System.Windows.Forms.Padding(0);this.btnSend.Name btnSend;this.btnSend.Size new System.Drawing.Size(120, 35);this.btnSend.TabIndex 5;this.btnSend.Text 发送;this.btnSend.UseVisualStyleBackColor true;this.btnSend.Click new System.EventHandler(this.btnSend_Click);// // btnClearWrite// this.btnClearWrite.Font new System.Drawing.Font(微软雅黑, 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnClearWrite.Location new System.Drawing.Point(776, 328);this.btnClearWrite.Margin new System.Windows.Forms.Padding(0);this.btnClearWrite.Name btnClearWrite;this.btnClearWrite.Size new System.Drawing.Size(120, 35);this.btnClearWrite.TabIndex 6;this.btnClearWrite.Text 清除发送;this.btnClearWrite.UseVisualStyleBackColor true;this.btnClearWrite.Click new System.EventHandler(this.btnClearWrite_Click);// // chk16Write// this.chk16Write.AutoSize true;this.chk16Write.Location new System.Drawing.Point(28, 50);this.chk16Write.Margin new System.Windows.Forms.Padding(4);this.chk16Write.Name chk16Write;this.chk16Write.Size new System.Drawing.Size(105, 19);this.chk16Write.TabIndex 7;this.chk16Write.Text 16进制发送;this.chk16Write.UseVisualStyleBackColor true;// // txtWrite// this.txtWrite.Location new System.Drawing.Point(244, 367);this.txtWrite.Margin new System.Windows.Forms.Padding(4);this.txtWrite.Multiline true;this.txtWrite.Name txtWrite;this.txtWrite.ScrollBars System.Windows.Forms.ScrollBars.Vertical;this.txtWrite.Size new System.Drawing.Size(652, 170);this.txtWrite.TabIndex 8;// // groupBox2// this.groupBox2.Controls.Add(this.chkWriteAutoWrap);this.groupBox2.Controls.Add(this.chk16Write);this.groupBox2.Location new System.Drawing.Point(10, 411);this.groupBox2.Margin new System.Windows.Forms.Padding(4);this.groupBox2.Name groupBox2;this.groupBox2.Padding new System.Windows.Forms.Padding(4);this.groupBox2.Size new System.Drawing.Size(221, 162);this.groupBox2.TabIndex 9;this.groupBox2.TabStop false;this.groupBox2.Text 发送设置;// // groupBox3// this.groupBox3.Controls.Add(this.chkReadAutoWrap);this.groupBox3.Controls.Add(this.chk16Read);this.groupBox3.Location new System.Drawing.Point(10, 263);this.groupBox3.Name groupBox3;this.groupBox3.Size new System.Drawing.Size(212, 140);this.groupBox3.TabIndex 10;this.groupBox3.TabStop false;this.groupBox3.Text 接收设置;// // label6// this.label6.AutoSize true;this.label6.Font new System.Drawing.Font(微软雅黑, 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.label6.Location new System.Drawing.Point(244, 7);this.label6.Name label6;this.label6.Size new System.Drawing.Size(88, 25);this.label6.TabIndex 11;this.label6.Text 数据接收;// // chkReadAutoWrap// this.chkReadAutoWrap.AutoSize true;this.chkReadAutoWrap.Location new System.Drawing.Point(28, 71);this.chkReadAutoWrap.Margin new System.Windows.Forms.Padding(4);this.chkReadAutoWrap.Name chkReadAutoWrap;this.chkReadAutoWrap.Size new System.Drawing.Size(149, 19);this.chkReadAutoWrap.TabIndex 3;this.chkReadAutoWrap.Text 自动添加回车换行;this.chkReadAutoWrap.UseVisualStyleBackColor true;// // chkWriteAutoWrap// this.chkWriteAutoWrap.AutoSize true;this.chkWriteAutoWrap.Location new System.Drawing.Point(28, 93);this.chkWriteAutoWrap.Margin new System.Windows.Forms.Padding(4);this.chkWriteAutoWrap.Name chkWriteAutoWrap;this.chkWriteAutoWrap.Size new System.Drawing.Size(149, 19);this.chkWriteAutoWrap.TabIndex 8;this.chkWriteAutoWrap.Text 自动添加回车换行;this.chkWriteAutoWrap.UseVisualStyleBackColor true;// // MainForm// this.AutoScaleDimensions new System.Drawing.SizeF(8F, 15F);this.AutoScaleMode System.Windows.Forms.AutoScaleMode.Font;this.ClientSize new System.Drawing.Size(919, 586);this.Controls.Add(this.label6);this.Controls.Add(this.groupBox3);this.Controls.Add(this.btnClearWrite);this.Controls.Add(this.btnSend);this.Controls.Add(this.groupBox2);this.Controls.Add(this.txtWrite);this.Controls.Add(this.btnClearRead);this.Controls.Add(this.txtRead);this.Controls.Add(this.groupBox1);this.Icon ((System.Drawing.Icon)(resources.GetObject($this.Icon)));this.Margin new System.Windows.Forms.Padding(4);this.MinimumSize new System.Drawing.Size(841, 559);this.Name MainForm;this.StartPosition System.Windows.Forms.FormStartPosition.CenterScreen;this.Text 串口助手;this.FormClosing new System.Windows.Forms.FormClosingEventHandler(this.MainForm_FormClosing);this.Load new System.EventHandler(this.MainForm_Load);this.groupBox1.ResumeLayout(false);this.groupBox1.PerformLayout();this.groupBox2.ResumeLayout(false);this.groupBox2.PerformLayout();this.groupBox3.ResumeLayout(false);this.groupBox3.PerformLayout();this.ResumeLayout(false);this.PerformLayout();}#endregionprivate System.Windows.Forms.GroupBox groupBox1;private System.Windows.Forms.Label label4;private System.Windows.Forms.Label label3;private System.Windows.Forms.Label label2;private System.Windows.Forms.Label label1;private System.Windows.Forms.Label label5;private System.Windows.Forms.Button btnOpen;private System.Windows.Forms.ComboBox cmbParity;private System.Windows.Forms.ComboBox cmbDataBits;private System.Windows.Forms.ComboBox cmbStopBits;private System.Windows.Forms.ComboBox cmbBaudRate;private System.Windows.Forms.ComboBox cmbPortName;private System.IO.Ports.SerialPort spt;private System.Windows.Forms.TextBox txtRead;private System.Windows.Forms.CheckBox chk16Read;private System.Windows.Forms.Button btnClearRead;private System.Windows.Forms.Button btnSend;private System.Windows.Forms.Button btnClearWrite;private System.Windows.Forms.CheckBox chk16Write;private System.Windows.Forms.TextBox txtWrite;private System.Windows.Forms.GroupBox groupBox2;private System.Windows.Forms.GroupBox groupBox3;private System.Windows.Forms.Label label6;private System.Windows.Forms.CheckBox chkReadAutoWrap;private System.Windows.Forms.CheckBox chkWriteAutoWrap;}
}
三、后台代码
using System;
using System.IO.Ports;
using System.Text;
using System.Windows.Forms;namespace SerialPortDemo
{public partial class MainForm : Form{string serialPortName;bool bListening false;//是否没有执行完invoke相关操作 串口防死锁bool bClosing false;//是否正在关闭串口执行Application.DoEvents并阻止再次invoke public MainForm(){InitializeComponent();}//窗体加载private void MainForm_Load(object sender, EventArgs e){//获取当前计算机的串行端口名的数组string[] ports SerialPort.GetPortNames();//使用 System.Array 中每个元素的 System.IComparable1 泛型接口实现对整个 System.Array 中的元素进行排序。Array.Sort(ports);//添加到显示列表cmbPortName.Items.AddRange(ports);cmbPortName.SelectedIndex cmbPortName.Items.Count 0 ? 0 : -1; //如果里面有数据,显示第0个//显示默认的显示cmbBaudRate.Text 9600; //波特率:9600cmbStopBits.Text 1;//默认停止位:1cmbDataBits.Text 8;//默认数据位:8cmbParity.Text 无;//默认奇偶校验位:无}//处理Windows消息 监听串口硬件的变化protected override void WndProc(ref Message m){//设备改变if (m.Msg 0x0219){//USB串口拔出if (m.WParam.ToInt32() 0x8004) //usb串口{string[] ports System.IO.Ports.SerialPort.GetPortNames(); //重新获取串口cmbPortName.Items.Clear(); //清除comboBox里面的数据cmbPortName.Items.AddRange(ports); //给comboBox1添加数据if (btnOpen.Text 关闭串口) //用户打开过串口{//如果串行端口已打开则为 true否则为 false。 默认值为 false。if (!spt.IsOpen){btnOpen.Text 打开串口;//释放由 System.ComponentModel.Component 使用的所有资源。spt.Dispose();cmbPortName.SelectedIndex cmbPortName.Items.Count 0 ? 0 : -1; //显示获取的第一个串口号}else{cmbPortName.Text serialPortName;}}else{cmbPortName.SelectedIndex cmbPortName.Items.Count 0 ? 0 : -1; //显示获取的第一个串口号}}//USB串口连上else if (m.WParam.ToInt32() 0x8000){string[] ports System.IO.Ports.SerialPort.GetPortNames();cmbPortName.Items.Clear();cmbPortName.Items.AddRange(ports);if (btnOpen.Text 关闭串口){cmbPortName.Text serialPortName;}else{cmbPortName.SelectedIndex cmbPortName.Items.Count 0 ? 0 : -1; //显示获取的第一个串口号}}}base.WndProc(ref m);}/// 字节数组转16进制字符串/// param namebytes/param/// returns String 16进制显示形式/returnspublic static string byteToHexStr(byte[] bytes){string returnStr ;try{if (bytes ! null){for (int i 0; i bytes.Length; i){returnStr bytes[i].ToString(X2);returnStr ; //两个16进制用空格隔开,方便看数据}}return returnStr;}catch (Exception){return returnStr;}}/// summary/// 字符串转16进制格式,不够自动前面补零/// /summary/// param namehexString/param/// returns/returnsprivate static byte[] strToToHexByte(String hexString){int i;hexString hexString.Replace( , );//清除空格 if ((hexString.Length % 2) ! 0)//奇数个 {byte[] returnBytes new byte[(hexString.Length 1) / 2];try{for (i 0; i (hexString.Length - 1) / 2; i){returnBytes[i] Convert.ToByte(hexString.Substring(i * 2, 2), 16);}returnBytes[returnBytes.Length - 1] Convert.ToByte(hexString.Substring(hexString.Length - 1, 1).PadLeft(2, 0), 16);}catch{MessageBox.Show(含有非16进制字符, 提示);return null;}return returnBytes;}else{byte[] returnBytes new byte[(hexString.Length) / 2];try{for (i 0; i returnBytes.Length; i){returnBytes[i] Convert.ToByte(hexString.Substring(i * 2, 2), 16);}}catch{MessageBox.Show(含有非16进制字符, 提示);return null;}return returnBytes;}}//打开或关闭private void btnOpen_Click(object sender, EventArgs e){if (btnOpen.Text 打开串口) //如果按钮显示的是打开{try //防止意外错误{spt.PortName cmbPortName.Text; //获取comboBox1要打开的串口号serialPortName cmbPortName.Text;spt.BaudRate int.Parse(cmbBaudRate.Text); //获取comboBox2选择的波特率spt.DataBits int.Parse(cmbDataBits.Text); //设置数据位/*设置停止位*/if (cmbStopBits.Text 1){spt.StopBits StopBits.One;}else if (cmbStopBits.Text 1.5){spt.StopBits StopBits.OnePointFive;}else if (cmbStopBits.Text 2){spt.StopBits StopBits.Two;}/*设置奇偶校验*/if (cmbParity.Text 无){spt.Parity Parity.None;}else if (cmbParity.Text 奇校验){spt.Parity Parity.Odd;}else if (cmbParity.Text 偶校验){spt.Parity Parity.Even;}//打开串口try{spt.Open();}catch{}btnOpen.Text 关闭串口;//按钮显示关闭串口cmbPortName.Enabled false;cmbBaudRate.Enabled false;cmbStopBits.Enabled false;cmbDataBits.Enabled false;cmbParity.Enabled false;}catch (Exception err){MessageBox.Show(打开失败 err.ToString(), 提示!);//对话框显示打开失败}}else{//关闭串口try{spt.Close();}catch (Exception){}btnOpen.Text 打开串口; //按钮显示打开cmbPortName.Enabled true;cmbBaudRate.Enabled true;cmbStopBits.Enabled true;cmbDataBits.Enabled true;cmbParity.Enabled true;}}//串口接收事件private void spt_DataReceived(object sender, SerialDataReceivedEventArgs e){if (bClosing true){return;}bListening true;int len spt.BytesToRead; //获取可以读取的字节数byte[] buff new byte[len]; //创建缓存数据数组// 摘要:// 从 System.IO.Ports.SerialPort 输入缓冲区读取一些字节并将那些字节写入字节数组中指定的偏移量处。//// 参数:// buffer:// 将输入写入到其中的字节数组。//// offset:// 要写入字节的 buffer 中的偏移量。//// count:// 最多读取的字节数。 如果 count 大于输入缓冲区中的字节数则读取较少的字节。//// 返回结果:// 读取的字节数。spt.Read(buff, 0, len);//C# 3.0以后代替委托的新方法Invoke((new Action(() {if (chk16Read.Checked) //16进制显示{if (chkReadAutoWrap.Checked){txtRead.AppendText(DateTime.Now.ToString() byteToHexStr(buff) \r\n);}else{txtRead.AppendText(DateTime.Now.ToString() byteToHexStr(buff));}}else{if (chkReadAutoWrap.Checked){txtRead.AppendText(DateTime.Now.ToString() Encoding.Default.GetString(buff) \r\n);}else{txtRead.AppendText(DateTime.Now.ToString() Encoding.Default.GetString(buff));}}})));bListening false;//用完了,主线程可以关闭串口了。 }//清除接收private void btnClearRead_Click(object sender, EventArgs e){txtRead.Clear();}//发送private void btnSend_Click(object sender, EventArgs e){if (spt.IsOpen false){MessageBox.Show(串口未打开);return;}string str txtWrite.Text.ToString();//获取发送文本框里面的数据if (chkWriteAutoWrap.Checked true){str \r\n;}try{if (str.Length 0){if (chk16Write.Checked) //16进制发送{byte[] byt strToToHexByte(str);// 摘要:// 使用缓冲区中的数据将指定数量的字节写入串行端口。//// 参数:// buffer:// 包含要写入端口的数据的字节数组。//// offset:// buffer 参数中从零开始的字节偏移量从此处开始将字节复制到端口。//// count:// 要写入的字节数。spt.Write(byt, 0, byt.Length);}else{//将指定的字符串写入串行端口。spt.Write(str);}}}catch (Exception){}}//清除发送private void btnClearWrite_Click(object sender, EventArgs e){txtWrite.Clear();}private void MainForm_FormClosing(object sender, FormClosingEventArgs e){bClosing true; // 根据当前串口对象来判断操作 while (bListening true){Application.DoEvents();}try{if (spt.IsOpen){spt.DiscardInBuffer();spt.DiscardOutBuffer();//取消订阅事件 防止又来了数据要处理造成状态栏显示数据时访问不存在的控件的问题spt.DataReceived - new SerialDataReceivedEventHandler(spt_DataReceived);spt.Close();}}catch{}}}
}
四、实例中要点
如下
1、串口的参数设置 2、串口名称的刷新通过重写消息函数监听的USB的变化更新电脑的端口变化。
3、打开和关闭串口尽量判定串口是否打开后在进行操作。
4、串口发送前判定是否已经打开。
5、串口的读取Read和发送Write函数的应用。
6、字符串和16进制的转换以及16进制显示的处理。
7、窗体的关闭与串口处理线程的处理通过增加标志位进行互斥处理保证每次关闭都能处理完毕后在关闭防止卡死。
8、串口接收事件是独立于UI线程的单独线程因此如果在串口接收线程下刷新UI控件需要用到异步执行本文使用 Invoke进行处理。
