VB.NET 串口访问之一

页面导航:首页 > 软件编程 > vb.net > VB.NET 串口访问之一

VB.NET 串口访问之一

来源: 作者: 时间:2016-01-18 16:54 【

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Impor

 

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 

摘自:wl58796351的专栏

Tags:

文章评论

最 近 更 新
热 点 排 行
Js与CSS工具
代码转换工具

<