VERSION 5.00
Object = "{248DD890-BB45-11CF-9ABC-0080C7E7B78D}#1.0#0"; "MSWINSCK.OCX"
Begin VB.Form frmMain 
   Caption         =   "Simple TCP Server/Client"
   ClientHeight    =   3825
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7380
   LinkTopic       =   "Form1"
   ScaleHeight     =   3825
   ScaleWidth      =   7380
   StartUpPosition =   3  'Windows Default
   Begin VB.Frame Frame2 
      Caption         =   "TCP Server"
      Height          =   3735
      Left            =   0
      TabIndex        =   1
      Top             =   0
      Width           =   3615
      Begin MSWinsockLib.Winsock tcpServer 
         Left            =   3240
         Top             =   480
         _ExtentX        =   741
         _ExtentY        =   741
         _Version        =   393216
      End
      Begin VB.TextBox txtServerHistory 
         Height          =   2775
         Left            =   120
         MultiLine       =   -1  'True
         TabIndex        =   11
         Top             =   840
         Width           =   3375
      End
      Begin VB.TextBox txtServerStatus 
         Height          =   285
         Left            =   720
         TabIndex        =   5
         Text            =   "Unknown"
         Top             =   240
         Width           =   2775
      End
      Begin VB.Label Label4 
         Caption         =   "Server History:"
         Height          =   255
         Left            =   120
         TabIndex        =   10
         Top             =   600
         Width           =   1215
      End
      Begin VB.Label Label2 
         Caption         =   "Status:"
         Height          =   255
         Left            =   120
         TabIndex        =   4
         Top             =   240
         Width           =   615
      End
   End
   Begin VB.Frame Frame1 
      Caption         =   "TCP Client"
      Height          =   3735
      Left            =   3720
      TabIndex        =   0
      Top             =   0
      Width           =   3615
      Begin MSWinsockLib.Winsock tcpClient 
         Left            =   0
         Top             =   480
         _ExtentX        =   741
         _ExtentY        =   741
         _Version        =   393216
      End
      Begin VB.TextBox txtClientHistory 
         Height          =   1935
         Left            =   120
         MultiLine       =   -1  'True
         TabIndex        =   12
         Top             =   1680
         Width           =   3375
      End
      Begin VB.TextBox txtClientToSend 
         Height          =   285
         Left            =   120
         TabIndex        =   8
         Top             =   1080
         Width           =   3375
      End
      Begin VB.CommandButton cmdClientDisconnect 
         Caption         =   "Disconnect"
         Height          =   375
         Left            =   2400
         TabIndex        =   7
         Top             =   600
         Width           =   1095
      End
      Begin VB.CommandButton cmdClientConnect 
         Caption         =   "Connect"
         Height          =   375
         Left            =   1320
         TabIndex        =   6
         Top             =   600
         Width           =   975
      End
      Begin VB.TextBox txtClientIP 
         Height          =   285
         Left            =   2160
         TabIndex        =   3
         Text            =   "127.0.0.1"
         Top             =   240
         Width           =   1335
      End
      Begin VB.Label Label5 
         Caption         =   "Client History:"
         Height          =   255
         Left            =   120
         TabIndex        =   13
         Top             =   1440
         Width           =   1215
      End
      Begin VB.Label Label3 
         Caption         =   "Text to Send:"
         Height          =   255
         Left            =   120
         TabIndex        =   9
         Top             =   840
         Width           =   1095
      End
      Begin VB.Label Label1 
         Caption         =   "IP Address to connect to:"
         Height          =   255
         Left            =   240
         TabIndex        =   2
         Top             =   240
         Width           =   1815
      End
   End
End
Attribute VB_Name = "frmMain"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Load()
   tcpServer.LocalPort = 1337 ' what to listen on
   tcpServer.Listen ' set up the TCP server
   tcpClient.RemotePort = 1337 ' what to connect to
End Sub
Private Sub Form_Unload(Cancel As Integer)
   tcpServer.Close
   tcpClient.Close
End Sub






''''''''''''''''''''''''
''' SERVER FUNCTIONS '''
''''''''''''''''''''''''
Private Sub tcpServer_Close()
   AddServerHistory "socket closed/reopened"
   If tcpServer.State <> sckClosed Then
      tcpServer.Close
   End If
   tcpServer.Listen ' reenable for next connection
End Sub

Private Sub tcpServer_ConnectionRequest(ByVal requestID As Long)
   AddServerHistory "socket connection request"
   If tcpServer.State <> sckClosed Then
      tcpServer.Close
   End If
   tcpServer.Accept requestID ' need to accept t he connection
   AddServerHistory "socket connected to " & tcpServer.RemoteHostIP & ":" & tcpServer.RemotePort
End Sub

Private Sub tcpServer_DataArrival(ByVal bytesTotal As Long)
   Dim val As String
   tcpServer.GetData val
   AddServerHistory "socket: " & val
End Sub

Private Sub tcpServer_Error(ByVal Number As Integer, Description As String, ByVal Scode As Long, ByVal Source As String, ByVal HelpFile As String, ByVal HelpContext As Long, CancelDisplay As Boolean)
   AddServerHistory "socket error: " & Source & ":" & Description
End Sub

Private Function AddServerHistory(val As String)
   txtServerHistory.Text = val & vbNewLine & Mid(txtServerHistory.Text, 1, 2000) ' limit the length of the scrollback
End Function









''''''''''''''''''''''''
''' CLIENT FUNCTIONS '''
''''''''''''''''''''''''
Private Sub cmdClientConnect_Click()
   AddClientHistory "Connecting"
   If tcpClient.State <> sckClosed Then
      tcpClient.Close
   End If
   tcpClient.RemoteHost = txtClientIP.Text
   tcpClient.Connect
End Sub
Private Sub cmdClientDisconnect_Click()
   tcpClient.Close
   AddClientHistory "Disconnected"
End Sub

Private Sub txtClientToSend_Change()
   If txtClientToSend.Text <> "" Then ' if there's something entered
      If tcpClient.State = sckConnected Then
         tcpClient.SendData txtClientToSend.Text
         AddClientHistory txtClientToSend.Text
      Else
         AddClientHistory "Not Connected"
      End If
      txtClientToSend.Text = ""
   End If
End Sub


Private Sub tcpClient_Close()
   AddClientHistory "socket closed"
End Sub

Private Sub tcpClient_Connect()
   AddClientHistory "socket connected to " & tcpClient.RemoteHostIP & ":" & tcpClient.RemotePort
End Sub

Private Sub tcpClient_Error(ByVal Number As Integer, Description As String, ByVal Scode As Long, ByVal Source As String, ByVal HelpFile As String, ByVal HelpContext As Long, CancelDisplay As Boolean)
   AddClientHistory "socket error: " & Source & ":" & Description
End Sub


Private Function AddClientHistory(val As String)
   txtClientHistory.Text = val & vbNewLine & Mid(txtClientHistory.Text, 1, 2000) ' limit us to 2000 lines, otherwise it grows out of control
End Function