这是我第一次在程序控制webrelay中使用网络。我能够成功地编写我的程序...或者我认为。几天前，我有一台设备从网络上掉线，我的程序“被锁定”。我知道它并没有真正锁定。我做了一些调试，发现发生的事情是当tcpclient抛出异常时，它会停止运行后面的任何代码。这导致我的程序停止更新，因为计时器从未重新启动，我无法控制模拟输出。
Public Class ControlPanelX317
Private SQL As New SQLControl
Private Sub ControlPanelX317_Load(sender As Object, e As EventArgs) Handles MyBase.Load
LoadControlsX317()
End Sub
'Dislay Conrol
'__________________________________________________________________________________________________________________________________________________________________________
Private Sub LoadControlsX317()
Dim loadqry As String = "SELECT * FROM controlsX317 WHERE controlsX317.ValueVoltageID = '" & 1 & "' "
Dim SQLCmd As New SqlCommand(loadqry, Sql.SQLCon)
If Sql.SQLCon.State = ConnectionState.Closed Then Sql.SQLCon.Open()
Dim reader As SqlDataReader = SQLCmd.ExecuteReader
While reader.Read = True
txt_S1_VolueVoltage.Text = reader("S1VolueVoltage")
txt_S2_VolueVoltage.Text = reader("S2VolueVoltage")
txt_S3_VolueVoltage.Text = reader("S3VolueVoltage")
txt_S4_VolueVoltage.Text = reader("S4VolueVoltage")
End While
SQLCmd.Dispose()
reader.Close()
Sql.SQLCon.Close()
End Sub
Private Sub btn_Save_ValueVoltage_Click(sender As Object, e As EventArgs) Handles btn_Save_ValueVoltage.Click
If txt_S1_VolueVoltage.Text > 10 Then
MsgBox("Max Voltage is 10V")
txt_S1_VolueVoltage.Clear()
Exit Sub
End If
If txt_S2_VolueVoltage.Text > 10 Then
MsgBox("Max Voltage is 10V")
txt_S2_VolueVoltage.Clear()
Exit Sub
End If
If txt_S3_VolueVoltage.Text > 10 Then
MsgBox("Max Voltage is 10V")
txt_S3_VolueVoltage.Clear()
Exit Sub
End If
If txt_S4_VolueVoltage.Text > 10 Then
MsgBox("Max Voltage is 10V")
txt_S4_VolueVoltage.Clear()
Exit Sub
End If
If txt_S1_VolueVoltage.Text <> "" Then
Dim UpdateValueVoltage As String = "UPDATE controlsX317 SET S1VolueVoltage='" & txt_S1_VolueVoltage.Text & "', S2VolueVoltage='" & txt_S2_VolueVoltage.Text & "',
S3VolueVoltage='" & txt_S3_VolueVoltage.Text & "', S4VolueVoltage='" & txt_S4_VolueVoltage.Text & "'
WHERE ValueVoltageID ='" & 1 & "' "
If SQL.DataUpdate(UpdateValueVoltage) = 0 Then
MsgBox("The Sysytem could not be found!!! ")
Else
MsgBox("VolueVoltage successfully changed")
End If
Else
MsgBox("You must restart a Sysytem")
End If
End Sub
Private Sub btn_S1_SetVoltage_Click(sender As Object, e As EventArgs) Handles btn_S1_SetVoltage.Click
lbl_S1_AnalogOutput.Text = Val(txt_S1_VolueVoltage.Text) * Val(txt_S1_ControlViltage.Text / 100) & "V"
End Sub
Private Sub btn_S2_SetVoltage_Click(sender As Object, e As EventArgs) Handles btn_S2_SetVoltage.Click
lbl_S2_AnalogOutput.Text = Val(txt_S2_VolueVoltage.Text) * Val(txt_S2_ControlViltage.Text / 100) & "V"
End Sub
Private Sub btn_S3_SetVoltage_Click(sender As Object, e As EventArgs) Handles btn_S3_SetVoltage.Click
lbl_S3_AnalogOutput.Text = Val(txt_S3_VolueVoltage.Text) * Val(txt_S3_ControlViltage.Text / 100) & "V"
End Sub
Private Sub btn_S4_SetVoltage_Click(sender As Object, e As EventArgs) Handles btn_S4_SetVoltage.Click
lbl_S4_AnalogOutput.Text = Val(txt_S4_VolueVoltage.Text) * Val(txt_S4_ControlViltage.Text / 100) & "V"
End Sub
'End Display Control
'_________________________________________________________________________________________________________________________________________________________________________
'Conection to WebRelay X317
'_________________________________________________________________________________________________________________________________________________________________________
Public Sub getWebRelayState()
Dim tcpClient As New TcpClient()
Dim port As Integer
Try
port = Convert.ToInt32(txtPort.Text)
tcpClient.Connect(txt_IPAddress.Text, port)
If tcpClient.Connected Then
'Create a network stream object
Dim netStream As NetworkStream = tcpClient.GetStream()
'If we can read and write to the stream then do so
If netStream.CanWrite And netStream.CanRead Then
'Send the on command to webrelay
Dim sendBytes As Byte() = Encoding.ASCII.GetBytes("GET /state.xml?noReply=0 HTTP/1.1" & vbCrLf & "Authorization: Basic bm9uZTp3ZWJyZWxheQ==" & vbCrLf & vbCrLf)
netStream.Write(sendBytes, 0, sendBytes.Length)
'Get the response from webrelay
Dim bytes(tcpClient.ReceiveBufferSize) As Byte
netStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
'Parse the response and update the webrelay state and input text boxes
Dim returndata As String = Encoding.ASCII.GetString(bytes)
'Parse out the relay state and input state
Dim array1 As Char() = returndata.ToCharArray()
Dim ana(4) As Integer
'Relay State found at index 66
If array1(66) = "1" Then
RelayState.Text = "ON"
Else
RelayState.Text = "OFF"
End If
'Input State found at index 94
If array1(94) = "1" Then
inputState.Text = "ON"
Else
inputState.Text = "OFF"
End If
End If
'Close the connection
tcpClient.Close()
End If
Catch ex As Exception
inputState.Text = "Error"
RelayState.Text = "Error"
'Disable the timer
TimerRelayRefresh.Enabled = False
End Try
End Sub
Private Sub sendRequest(ByVal val As String)
Dim tcpClient As New TcpClient()
Dim port As Integer
Try
'Disable the timer
TimerRelayRefresh.Enabled = False
port = Convert.ToInt32(txtPort.Text)
tcpClient.Connect(txt_IPAddress.Text, port)
If tcpClient.Connected Then
MsgBox("connection successful")
'Create a network stream object
Dim netStream As NetworkStream = tcpClient.GetStream()
'If we can read and write to the stream then do so
If netStream.CanWrite And netStream.CanRead Then
'Send the on command to webrelay
Dim sendBytes As Byte() = Encoding.ASCII.GetBytes("GET /state.xml?relayState=1 HTTP/1.1<CR><LF>" & vbCrLf & "Authorization: Basic bm9uZTp3ZWJyZWxheQ==<CR><LF><CR><LF>" & vbCrLf & vbCrLf)
netStream.Write(sendBytes, 0, sendBytes.Length)
'Get the response from webrelay
Dim bytes(tcpClient.ReceiveBufferSize) As Byte
netStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
'Parse the response and update the webrelay state and input text boxes
Dim returndata As String = Encoding.ASCII.GetString(bytes)
'Parse out the relay state and input state
Dim array1 As Char() = returndata.ToCharArray()
'Relay State found at index 66
If array1(66) = "1" Then
RelayState.Text = "ON"
Else
RelayState.Text = "OFF"
End If
'Input State found at index 94
If array1(94) = "1" Then
inputState.Text = "ON"
End If
Else
inputState.Text = "OFF"
End If
End If
'Enable the timer
TimerRelayRefresh.Enabled = True
Catch ex As Exception
inputState.Text = "Error"
RelayState.Text = "Error"
'Disable the timer
TimerRelayRefresh.Enabled = False
End Try
End Sub
Private Sub btn_ControlsX317_On_Click(sender As Object, e As EventArgs) Handles btn_ControlsX317_On.Click
sendRequest("1")
End Sub
Private Sub btn_ControlsX317_Off_Click(sender As Object, e As EventArgs) Handles btn_ControlsX317_Off.Click
sendRequest("0")
End Sub
Private Sub btn_ControlsX317_PULSE_Click(sender As Object, e As EventArgs) Handles btn_ControlsX317_PULSE.Click
sendRequest("2")
End Sub
'End Conetion
'_________________________________________________________________________________________________________________________________________________________________________
结束班