Windows service creation gives an error

I created a windows service but I get an error when I run it:

Quote:

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service on local computer started and then it stopped. Some services stop automatically if they are not used by other services or programs.

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But I carry a calculator that will connect to this service will pay the bill and return the same result in this application. In short, please help me. The code for my service

Code:

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Imports System.Net.sockets
 
Public Class Service1
 
    Private listener As Net.Sockets.TcpListener
    Const PORT_NUM As Integer = 1039
    Dim EndPoint As Net.IPEndPoint
 
    Protected Overrides Sub OnStart(ByVal args() As String)
        Dim iip As Long = 16777343
        EndPoint = New Net.IPEndPoint(iip, 1039)
        listener.Server.Bind(EndPoint)
        listener.Start()
        Dim state As New StateObject()
        state.workSocket = listener
        listener.Server.Receive(state.buffer, 1, state.BufferSize, Net.Sockets.SocketFlags.None)
        Dim letter As String = state.sb.ToString
        Dim table As Array = letter.Split("/")
        Dim nb1, nb2, nb3 As Double
        nb1 = Double.Parse(table.GetValue(0))
        nb2 = Double.Parse(table.GetValue(1))
        nb3 = nb1 + nb2
        Dim fin As String = nb3.ToString
        Dim Content() As Byte = System.Text.Encoding.ASCII.GetBytes(fin.ToCharArray())
        Dim size As Integer = Content.Length
        listener.Server.Send(Content, 1, size, Net.Sockets.SocketFlags.None)
    End Sub
 
    Protected Overrides Sub OnStop()
        listener.Stop()
    End Sub
 
    Public Class StateObject
        Public workSocket As System.Net.Sockets.TcpListener = Nothing
        Public BufferSize As Integer = 256
        Public buffer(256) As Byte
        Public sb As New System.Text.StringBuilder()
    End Class 'StateObject
End Class

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Your Sub OnStart does not seem to do much. If so, at the end of the sub, the service stops. Making a read or BeginRead on the socket, it should hold the program and thus prevent the service stop. General service in OnStart is just a start in a thread and the thread continues an infinite loop by processing.

Thank you for your answer! I did this and tried to see if the windows service is listening:

Code:

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Imports System.Net.sockets
Public Class Calculate
 
    Private listener As Net.Sockets.TcpListener
    Const PORT_NUM As Integer = 1039
    Dim EndPoint As Net.IPEndPoint

    Protected Overrides Sub OnStart(ByVal args() As String)
        'ip : 10.80.109.132 gives:'
        Dim iip As Long = 16777343
        'ip localhost : 127.0.0.1'
        EndPoint = New Net.IPEndPoint(iip, 1039)
        listener.Server.Bind(EndPoint)
        listener.Start()
 
        Dim data As String
        Dim bytes(1024) As Byte
        While True
            Dim client As TcpClient = listener.AcceptTcpClient()
            data = Nothing
            Dim Stream As NetworkStream = client.GetStream()
            Dim i As Int32
            i = stream.Read(bytes, 0, bytes.Length
            While (i <> 0)
                data = System.Text.Encoding.ASCII.GetString(bytes, 0, i)
                Dim nb1, nb2, nb3 As Double
                Dim table As Array = data.Split("/")
                nb1 = Double.Parse(table.GetValue(0))
                nb2 = Double.Parse(table.GetValue(1))
                nb3 = nb1 + nb2
                Dim fin As String = nb3.ToString
                Dim Content() As Byte = System.Text.Encoding.ASCII.GetBytes(fin.ToCharArray())
                Stream.Write(Content, 0, Content.Length)
                i = Stream.Read(bytes, 0, bytes.Length)
 
            End While
            client.Close()
        End While
 
    End Sub
 
    Protected Overrides Sub OnStop()
        listener.Stop()
    End Sub
 
End Class

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Why don't you put a try catch block in your code with registration error somewhere, because if an error occurs, the service stops and you do not see the error. The OnStart should be light, and thus it should just be used to start the service, but I do not guarantee about the solution but this is just a suggestion.

I managed to part the service and I owe a lot (I set the automatic start). Unfortunately, here 20 minutes that I fight with the party sending data to the calculator and I'm looking on google I found nothing:

I made this procedure that sends data on the ip and port that I made a listen:

Code:

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Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
 
        Dim n1 As String
        Dim n2 As String
        Dim nn As String
        Dim endpoint As Net.IPEndPoint
        Try
 
            n1 = TextBox1.Text
            n2 = TextBox2.Text
            nn = n1 + "/" + n2
 
            Dim Content() As Byte = System.Text.Encoding.ASCII.GetBytes(nn.ToCharArray())
            Dim ls As Integer = Content.Length
            'ip : 10.80.109.132 gives:'
            Dim iiip As Long = 16777343
            'ip localhost : 127.0.0.1'
            endpoint = New Net.IPEndPoint(iiip, 1039)
            Dim foo As Net.Sockets.TcpClient = New Net.Sockets.TcpClient(endpoint)
            tutu.Connect(endpoint)
            Dim stream As Net.Sockets.NetworkStream = foo.GetStream()
 
            stream.Write(Content, 0, Content.Length)
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Sub
End Class

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