一不小心看到一高手写的C#串中操作系列的文章，很不错，可惜我辈不懂C#,于是顺便改成用VB.NET2010

其中几乎都有注解。

顺便说明，再发送16进制不是很完善，有懂的兄弟，说明一下

Imports System Imports System.Collections.Generic Imports System.ComponentModel Imports System.Data Imports System.Drawing Imports System.Linq Imports System.Text Imports System.IO.Ports Imports System.Text.RegularExpressions Public Class Form1 WithEvents Comm As SerialPort = New SerialPort Private Builder As StringBuilder = New StringBuilder '避免在事件处理方法中反复的创建，所以定义到外面 Private ReceiveCount As Long = 0 '接收计数 Private SendCount As Long = 0 '发送计数 Private Listening As Boolean = False '是否没有执行完invoke相关操作 Private Closingg As Boolean = False '是否正在关闭串口，执行Application.DoEvents，并阻止再次invoke Public Delegate Sub UpdateData(ByVal mByte() As Byte) Public Sub ShowData(ByVal mByte() As Byte) Console.WriteLine(mByte) ReceiveCount += mByte.Length Builder.Clear() If CheckBoxHex.Checked Then For Each b As Byte In mByte Builder.Append(b.ToString("X2") + " ") Next Else Builder.Append(Encoding.ASCII.GetString(mByte)) End If TxtGet.AppendText(Builder.ToString) labelGetCount.Text = "Get:" + ReceiveCount.ToString End Sub Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load '初始化下拉串口名称列表框 Dim Ports() As String = SerialPort.GetPortNames Array.Sort(Ports) ComboPortName.Items.AddRange(Ports) ComboPortName.SelectedIndex = IIf(ComboPortName.Items.Count > 0, 0, -1) ComboBaudrate.SelectedIndex = ComboBaudrate.Items.IndexOf("9600") '初始化Serialport对象 Comm.NewLine = vbCrLf Comm.RtsEnable = True 'AddHandler Obj.Ev_Event, AddressOf EventHandler 'RemoveHandler Obj.Ev_Event, AddressOf EventHandler 'AddHandler Comm.DataReceived, AddressOf Comm_DataReceived End Sub Private Sub Comm_DataReceived(sender As Object, e As System.IO.Ports.SerialDataReceivedEventArgs) Handles Comm.DataReceived If Closingg Then Return '如果正在关闭，忽略操作，直接返回，尽快的完成串口监听线程的一次循环 Try Listening = True '设置标记，说明我已经开始处理数据，一会儿要使用系统UI的。 Dim n As Long = Comm.BytesToRead '先记录下来，避免某种原因，人为的原因，操作几次之间时间长，缓存不一致 Dim Buf(n - 1) As Byte '声明一个临时数组存储当前来的串口数据 Comm.Read(Buf, 0, n) '读取缓冲数据 Builder.Clear() '清除字符串构造器的内容 Dim b As UpdateData = New UpdateData(AddressOf ShowData) Me.BeginInvoke(b, Buf) Catch ex As Exception Err.Clear() Finally Listening = False '我用完了，ui可以关闭串口了。 End Try End Sub Private Sub ShowMsg(ByVal buffer() As Byte) If CheckBoxHex.Checked Then For Each b As Byte In Buffer Builder.Append(b.ToString("X2") + " ") Next Else Builder.Append(Encoding.ASCII.GetString(buffer)) End If Me.TxtGet.AppendText(Builder.ToString()) labelGetCount.Text = "Get:" + ReceiveCount.ToString End Sub Private Sub BtnXOpen_Click(sender As System.Object, e As System.EventArgs) Handles BtnXOpen.Click '根据当前串口对象，来判断操作 If Comm.IsOpen Then Closingg = True ' While Listening Application.DoEvents() End While '打开时点击，则关闭串口 Comm.Close() Closingg = False Else Comm.PortName = ComboPortName.Text Comm.BaudRate = Integer.Parse(ComboBaudrate.Text) Try Comm.Open() Catch ex As Exception '捕获到异常信息，创建一个新的comm对象，之前的不能用了。 Comm = New SerialPort '现实异常信息给客户。 MessageBox.Show(ex.Message) End Try End If '设置按钮的状态 BtnXOpen.Text = IIf(Comm.IsOpen, "Close", "Open") BtnXOpen.Enabled = Comm.IsOpen End Sub '动态的修改获取文本框是否支持自动换行。 Private Sub CheckBoxNewLineGet_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles CheckBoxNewLineGet.CheckedChanged TxtGet.WordWrap = CheckBoxNewLineGet.Checked End Sub Private Sub BtnXSend_Click(sender As System.Object, e As System.EventArgs) Handles BtnXSend.Click Dim n As Integer = 0 '定义一个变量，记录发送了几个字节 If checkBoxHexSend.Checked Then '16进制发送 '我们不管规则了。如果写错了一些，我们允许的，只用正则得到有效的十六进制数 Dim Mc As MatchCollection = Regex.Matches(TxtSend.Text.Trim, "(?i)[/da-f]{2}") '"(?i)[/da-f]{2}" Dim buf As List(Of Byte) = New List(Of Byte) '依次添加到列表中 For Each m As Match In Mc ' buf.Add(Byte.Parse(m.Value)) buf.Add(Byte.Parse(m.Value, System.Globalization.NumberStyles.HexNumber)) Next '转换列表为数组后发送 Comm.Write(buf.ToArray, 0, buf.Count) n = buf.Count Else 'ascii编码直接发送 '包含换行符 If checkBoxNewlineSend.Checked Then Comm.WriteLine(TxtSend.Text) n = TxtSend.Text.Length + 2 Else Comm.Write(TxtSend.Text) n = TxtSend.Text.Length End If End If SendCount += n '累加发送字节数 labelSendCount.Text = "Send:" + SendCount.ToString End Sub Private Sub BtnXReset_Click(sender As System.Object, e As System.EventArgs) Handles BtnXReset.Click '复位接受和发送的字节数计数器并更新界面。 SendCount = 0 ReceiveCount = 0 labelGetCount.Text = "Get:0" labelSendCount.Text = "Send:0" Builder.Clear() End Sub Private Sub BtxClear_Click(sender As System.Object, e As System.EventArgs) Handles BtxClear.Click TxtGet.Text = "" Builder.Clear() End Sub End Class