' ============================================================================
' シリアル通信 サンプルプログラム
'
' <SerialCommunication.vb>
'
' Copyright (c) 2009 Servoland corporation.
' All rights reserved.
'
' 目的：
' SerialPortクラスを用いたシリアル通信を行います。
'
' 注意：
' 使用時には実際のポート名(COM1,COM2など)および通信速度(bps)の設定を
' 行う必要があります。
'
' Version情報： -- 追加, 修正項目 --
' Version 1.0 2009.08.19 : First construction.
'
' ============================================================================
Public Class SerialCommunication
Dim TempStr As String ' 一時文字列
Private Sub SerialCommunication_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
With SerialPort1
.PortName = "COM1"
.BaudRate = 1200
.DataBits = 8
.Parity = IO.Ports.Parity.None
.StopBits = IO.Ports.StopBits.One
.ReceivedBytesThreshold = 1
End With
End Sub
Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Dim value As Char
Dim str As String
value = e.KeyChar
If value = vbCr Then
str = TextBox1.Text.ToUpper() + vbCr
If SerialPort1.IsOpen Then
SerialPort1.Write(str)
End If
TextBox1.SelectAll()
End If
End Sub
Private Sub btnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOpen.Click
If SerialPort1.IsOpen = False Then
Try
SerialPort1.Open()
Catch ex As Exception
MessageBox.Show(ex.Message, "エラー", _
MessageBoxButtons.OK, _
MessageBoxIcon.Error, _
MessageBoxDefaultButton.Button3)
End Try
Else
MessageBox.Show("既にシリアルポートを開いています。", "エラー", _
MessageBoxButtons.OK, _
MessageBoxIcon.Warning, _
MessageBoxDefaultButton.Button3)
End If
End Sub
Private Sub btnClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClose.Click
If SerialPort1.IsOpen = True Then
SerialPort1.Close()
End If
End Sub
Private Sub SerialCommunication_FormClosed(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles MyBase.FormClosed
If SerialPort1.IsOpen = True Then
SerialPort1.Close()
End If
End Sub
Delegate Sub RecvDataDelegate(ByVal RecvStr As String)
Private Sub RecvData(ByVal RecvStr As String)
' 受信欄更新
TextBox2.Text = RecvStr
' 受信履歴更新
RichTextBox1.Text = RichTextBox1.Text + RecvStr + vbCr
' 受信履歴の最下行表示
RichTextBox1.SelectionStart = RichTextBox1.Text.Length - 1
RichTextBox1.ScrollToCaret()
End Sub
Private Sub SerialPort1_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
Dim Recv As New RecvDataDelegate(AddressOf RecvData)
Dim strReceived As String
Try
' 受信データ読込
strReceived = SerialPort1.ReadExisting()
' 受信文字列結合
TempStr = TempStr + strReceived
' CR受信(受信完了)
If strReceived(strReceived.Length - 1) = vbCr Then
' CR削除
TempStr = TempStr.Remove(TempStr.Length - 1, 1)
' TextBox1からInvoke
TextBox1.Invoke(Recv, TempStr)
' 一時文字列初期化
TempStr = ""
End If
Catch ex As Exception
MessageBox.Show(ex.Message, "受信エラー", _
MessageBoxButtons.OK, _
MessageBoxIcon.Error, _
MessageBoxDefaultButton.Button3)
End Try
End Sub
End Class
