Data Parsing

[Yusuf Utomo]

I want to parse the data from raspberry to server through WIFI connection the GUI server like pic below, but when I use timer to automatically parse data it won’t work automatically and I try to use button to trigger the parse data form Raspberry. What code should I attach to my GUI server to make it receive the data from raspberry and automatically parse it?



This is the code

Imports System.Net
Imports System.Net.Sockets


Public Class Form1
    Dim TCPServer As Socket
    Dim TCPListener As TcpListener

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        TCPListener = New TcpListener(IPAddress.Any, 1000)
        TCPListener.Start()
        TCPServer = TCPListener.AcceptSocket()
        TCPServer.Blocking = False
        Timer1.Enabled = True
    End Sub

    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick

        Try
            Dim rcvbytes(TCPServer.ReceiveBufferSize) As Byte
            TCPServer.Receive(rcvbytes)
            TextBox2.Text = System.Text.Encoding.ASCII.GetString(rcvbytes)
            Timer2.Enabled = True
        Catch ex As Exception
        End Try
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim sendbytes() As Byte = System.Text.Encoding.ASCII.GetBytes(TextBox1.Text)
        TCPServer.Send(sendbytes)
    End Sub

    Private Sub Timer2_Tick(sender As Object, e As EventArgs) Handles Timer2.Tick
        Dim S As String

        S = TextBox2.Text + "," + "," + "," + ""
        Dim somestring() As String
        somestring = S.Split(New Char() {","c})

        TextBox3.Text = somestring(0)
        TextBox4.Text = somestring(1)
        TextBox2.Text = ""
    End Sub
End Class

[jmcilhinney]

I've never actually used a Socket directly before but I believe that, if you use the asynchronous methods it provides instead of the synchronous ones, you can begin an asynchronous operation and it will just complete when data becomes available, alleviating the need for the Timer. The asynchronous methods are more complex than the synchronous ones but, ultimately, more useful.

[Yusuf Utomo]

Do you have an example asynchronous for this server ? @Jmcilhinney maybe i can learn it

[jmcilhinney]

The appropriate response is for you to read the relevant documentation, look for examples yourself and then post back if you need more help after that. If someone points you in a particular direction, you should go in that direction, not stand where you are and ask for an explanation of what you would find if you did go in that direction. Look first, ask questions later.

That said, I have written an example that uses asynchronous methods with a TcpClient, but not with a Socket directly. You could take a look at that if you wanted and it may provide some ideas at least. You can find that Asynchronous TCP thread by following the CodeBank link in my signature below.

[Yusuf Utomo]

or maybe does anyone have an any solution for this problem ?