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 Post subject: How to Port MS to .NET
PostPosted: Sat Oct 19, 2019 6:52 pm 
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This is a starter guide but it will take you very far, it should help you convert your ms server completely. You should always start by converting the server. So do not bother converting the client and server at the same time. You can start converting the ms vb6 client when you can connect with that client to your finished ms server in .NET.

How to Port to VB .net or .net Core.
1. Download Visual Studio 2008.
2. Open your VB project with it and chose convert and run the wizard (begin with the server, its easiest).
3. Run your new vb.net server, and fix all the common errors that appeared.
4. Remove your frmServer and create a new form called ServerWindow (move some data if needed from frmServer).
5. Download https://www.codeproject.com/Articles/11422/Winsock-NET (this one had a bug in it, so when I first tested this I had to modify a row in the source code. So would recommend you include the project so you can debug it easier. This is if you actually want winsock. I used it initially for a smooth port and later changed to TcpClient: https://docs.microsoft.com/en-us/dotnet ... mework-4.8)
6. Implement winsock net to your project.
7. If you have byte arrays you will have more difficulties, I had to rewrite all of modBuffer etc.
8. Make sure things work, connect the client.

Things that confused me at first
  • I was not aware that VB6 and VB.net had missmatching variable declarations. So for example a Long in VB6 is a Integer in VB.net, a Integer in VB6 is a Short in VB.net. So that caused issues for me when I was trying to read all my binary data files (map,items etc...). Because all those bytes need to match exactly. And for some files they still didnt match and that was because VB6 just reads it and doesnt care if it missmatches with the length of the file. While vb.net crashes, but that was basicly solved by try catching the get function for the data, cause the data was still read.
  • Encodings was a issue, there is like ASCII, ETF8, UNIFORM etc when converting to and from bytes. It took me sometime to grasp the fact that that was the issue. But I basically use System.Text.Encoding.Default. for now. You mainly just search for System.Text.Encoding. in your vb.net converted server to see all the locations for it.
  • Its also a little tricky with the indexes of arrays, since vb6 has arrays from value 1-10 for exmple, but thats forbidden in vb.net (it has to start from 0). So there was a -1 here and there to take care of that.

Winsock .NET
Here is the winsock part, pretty short and simple. All you do is add:

    Public Shared Network As New Sockethandler

in the ServerWindow class. And add:

in the ServerWindow form loaded sub.

And then you will have some errors with frmServer.Socket that you change to ServerWindow.Server...

Imports System.Collections.Generic
Imports System.Net.Sockets
Imports Winsock_Control

Public Class Sockethandler

    Public WithEvents Server As Winsock
    Public Sockets As New Dictionary(Of Integer, Winsock)
    Private m_SocketsToRemove As New List(Of Winsock)

    Public Sub Initialize()
        Server = New Winsock
        Server.LocalPort = 4000
        Server.RemotePort = 4000
        Server.RemoteIP = ""
    End Sub

    Public Function GetState(index As Integer) As WinsockStates
        If TryGetUser(index) Is Nothing Then
            Return WinsockStates.Closed
        End If

        Return TryGetUser(index).GetState
    End Function

    Public Function TryGetIndex(socket As Winsock) As Integer
        For Each item As KeyValuePair(Of Integer, Winsock) In Sockets
            If item.Value Is socket Then
                Return item.Key
            End If
        Return -1
    End Function

    Public Function TryGetUser(index As Integer) As Winsock
        If Sockets.ContainsKey(index) Then Return Sockets(index)

        Return Nothing
    End Function

    Private Sub Socket_ConnectionRequest(sender As Winsock, requestID As Socket) Handles Server.ConnectionRequest
            Dim i As Integer
            i = FindOpenPlayerSlot()

            Sockets.Add(i, sender)
            Dim ws As Winsock = CType(sender, Winsock)

            AddHandler ws.DataArrival, AddressOf wsk_DataArrival
            AddHandler ws.Disconnected, AddressOf wsk_Disconnected


            Call AcceptConnection(ws, requestID, i)
        Catch ex As Exception
        End Try
    End Sub

    Private Sub wsk_Disconnected(sender As Winsock)
        If m_SocketsToRemove.Contains(sender) Then Exit Sub

        If m_SocketsToRemove.Count > 0 Then
            Catch ex As Exception
            End Try
        End If
    End Sub

    Private Sub wsk_DataArrival(sender As Winsock, BytesTotal As Integer)
        If IsConnected(TryGetIndex(sender)) Then
            Call IncomingData(TryGetIndex(sender), BytesTotal)
        End If
    End Sub

End Class

Client Graphics
I'm using SFML for the graphics and most likely the audio ( https://www.sfml-dev.org/ ).
SFML provides a simple interface to the various components of your PC, to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics, audio and network.
With SFML, your application can compile and run out of the box on the most common operating systems: Windows, Linux, macOS and soon Android & iOS.

Additional info
1. Download and install: http://go.microsoft.com/fwlink/?linkid=321343
1.1 Make sure it works on computer without powerpacks installed. Those files should be included in EXE.
2. Needed to put Interop.DxVBLib.dll into my: C:\Windows\SysWOW64 folder!
3. Temporarily added ms symbols (should be able to ignore this): http://www.vbforums.com/showthread.php? ... e-PDB-file
4. Net framework 4 on project.
5. Used this for smooth form transitions: http://vbcity.com/forums/t/158363.aspx (put in my basepage).

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PostPosted: Fri Oct 09, 2020 10:30 am 

Joined: Fri Oct 09, 2020 10:28 am
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