VB code example for KMtronic WEB 2 Relay board

KMTronic_WEB_2_RELAYS_Control_VB_Code.zip

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Imports System.ComponentModel
Imports System.Text
Imports System.Threading
Imports Microsoft.Win32
Imports System.Web
Imports System.Net
Imports System.IO

Namespace WebRelays
    Partial Public Class Form1
        Inherits Form

        Private HTTP_Req As String = Nothing
        Private myWebRequest As WebRequest
        Private myWebResponse As WebResponse
        Private myWebRequest1 As WebRequest
      '  WebResponse myWebResponse1;
        Private myWebRequest2 As WebRequest
       ' WebResponse myWebResponse2;
        Private webCredential As Boolean = True
        Private uStatus As Thread
        Private content As String = Nothing
        Private run As Boolean = False


        Public Sub New()
            InitializeComponent()
            txtbxIP.Text = "88.87.29.148"
            txtbxUN.Text = "admin"
            txtbxPW.Text = "admin"
            txtbxHP.Text = "1234"
            button1.Enabled = False
            button2.Enabled = False
            lblR1.Text = Nothing
            lblR2.Text = Nothing
            txtbxPW.PasswordChar = "*"c

        End Sub

        Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
            Try
                HTTP_Req = "http://" & txtbxIP.Text & ":" & txtbxHP.Text & "/relays.cgi?relay=1"
                myWebRequest1 = WebRequest.Create(HTTP_Req)
                myWebRequest1.Credentials = New NetworkCredential(txtbxUN.Text, txtbxPW.Text)
                myWebRequest1.Method = "POST"
                myWebRequest1.ContentType = ""
                myWebRequest1.ContentLength = 0
                Dim dataStream As Stream = myWebRequest1.GetResponse().GetResponseStream()
                dataStream.Close()
            Catch
            End Try
        End Sub

        Private Sub button2_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button2.Click
            Try
                HTTP_Req = "http://" & txtbxIP.Text & ":" & txtbxHP.Text & "/relays.cgi?relay=2"
                myWebRequest2 = WebRequest.Create(HTTP_Req)
                myWebRequest2.Credentials = New NetworkCredential(txtbxUN.Text, txtbxPW.Text)
                myWebRequest2.Method = "POST"
                myWebRequest2.ContentType = ""
                myWebRequest2.ContentLength = 0
                Dim dataStream As Stream = myWebRequest2.GetResponse().GetResponseStream()
                dataStream.Close()
            Catch
            End Try
        End Sub


        Private Sub updateStatus()
            Do While run = True
                Try
                    HTTP_Req = "http://" & txtbxIP.Text & ":" & txtbxHP.Text & "/relays.cgi"
                    myWebRequest = WebRequest.Create(HTTP_Req)
                    myWebRequest.Credentials = New System.Net.NetworkCredential(txtbxUN.Text, txtbxPW.Text)
                    myWebRequest.Method = "POST"
                    myWebRequest.ContentType = ""
                    myWebRequest.ContentLength = 0
                    Dim dataStream As Stream = myWebRequest.GetResponse().GetResponseStream()
                    dataStream.ReadTimeout = 1000
                   ' StreamReader objReader = new StreamReader(dataStream, Encoding.UTF8);
                   ' myWebResponse = myWebRequest.GetResponse();
                    'Stream receiveStream = myWebResponse.GetResponseStream();
                    Dim reader As New StreamReader(dataStream, Encoding.UTF8)
                    content = reader.ReadToEnd()
                    dataStream.Close()
                    Me.Invoke(New EventHandler(AddressOf tBox))
                    Thread.Sleep(5)
                Catch
                End Try
            Loop
        End Sub


        Private Sub tBox(ByVal sender As Object, ByVal e As EventArgs)

            Dim status(10) As Char
            Dim relay1(37) As Char
            Dim relay2(37) As Char
            Dim relay1name As String = Nothing
            Dim relay2name As String = Nothing

            For i As Integer = 0 To content.Length - 11 - 1
                For j As Integer = 0 To 10
                    status(j) = content.Chars(i + j)
                Next j

                If status(0) = "S"c AndAlso status(1) = "t"c AndAlso status(2) = "a"c AndAlso status(3) = "t"c AndAlso status(4) = "u"c AndAlso status(5) = "s"c Then
                    If status(8) = "0"c Then
                        button1.BackColor = Color.Green
                        button1.Text = "Click to TURN ON"

                    Else
                        button1.BackColor = Color.Red
                        button1.Text = "Click to TURN OFF"
                    End If

                    If status(10) = "0"c Then
                        button2.BackColor = Color.Green
                        button2.Text = "Click to TURN ON"

                    Else
                        button2.BackColor = Color.Red
                        button2.Text = "Click to TURN OFF"
                    End If
                End If
            Next i


            For i As Integer = 0 To content.Length - 38 - 1
                For j As Integer = 0 To 37
                    relay1(j) = content.Chars(i + j)
                Next j

                If relay1(0) = "R"c AndAlso relay1(1) = "e"c AndAlso relay1(2) = "l"c AndAlso relay1(3) = "a"c AndAlso relay1(4) = "y"c AndAlso relay1(5) = "1"c AndAlso relay1(6) = ":"c AndAlso relay1(7) = " "c Then
                    For z As Integer = 0 To 29
                        relay1name &= relay1(z + 8)
                    Next z
                    lblR1.Text = relay1name
                End If
            Next i


            For i As Integer = 0 To content.Length - 38 - 1
                For j As Integer = 0 To 37
                    relay2(j) = content.Chars(i + j)
                Next j

                If relay2(0) = "R"c AndAlso relay2(1) = "e"c AndAlso relay2(2) = "l"c AndAlso relay2(3) = "a"c AndAlso relay2(4) = "y"c AndAlso relay2(5) = "2"c AndAlso relay2(6) = ":"c AndAlso relay2(7) = " "c Then
                    For z As Integer = 0 To 29
                        relay2name &= relay2(z + 8)
                    Next z
                    lblR2.Text = relay2name
                End If
            Next i




        End Sub

        Private Sub button3_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button3.Click
            If button3.Text = "Start" Then
                button3.Text = "Stop"
                run = True
                uStatus = New Thread(New ThreadStart(AddressOf updateStatus))
                Try
                    uStatus.IsBackground = True
                    uStatus.Start()

                Catch
                End Try
                button1.Enabled = True
                button2.Enabled = True
                txtbxIP.Enabled = False
                txtbxUN.Enabled = False
                txtbxPW.Enabled = False
                txtbxHP.Enabled = False

            ElseIf button3.Text = "Stop" Then
                button3.Text = "Start"
                run = False
                If uStatus.IsAlive = True Then
                    Try
                        uStatus.Abort()
                    Catch
                    End Try
                End If
                button1.Enabled = False
                button2.Enabled = False
                txtbxIP.Enabled = True
                txtbxUN.Enabled = True
                txtbxPW.Enabled = True
                txtbxHP.Enabled = True
            End If
        End Sub

    End Class
End Namespace

 

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