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Free Visual Basic and Winsock ebook. Free ebook - TCP client - server

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    Simple system TCP Client-Server on VB
    Ebook. Programming Client + Server (with TCP) on Visual Basic
    
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    Lets write a simple set out of two programs client and server applications, transmitting information and commands through the network using the protocol TCP. We will use network functions through Microsoft Winsock Control.
  

Visual Basic TCP Cliet-Server


    
    Server
  
    Free ebook    Project - from Project select Components
  
    Free ebook - select Microsoft Winsock Control
  
    Free ebook - Microsoft Winsock Control Project added
  
    Now we may use this control. Lets place it in the field of the form Form1
  
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    We write the actions to be performed at the start of Server. During loading the form Form1 we will check whether the connection sckConnected is available and check that the program is not under the listening mode of the prescribed port sckListening.
    Private Sub Form_Load()
    oflameron - name Winsock

    Form1.Visible = True Form1 is visible

    Do

    If oflameron.State <>
sckConnected And oflameron.State <> sckListening Then
        oflameron.Close All the connections are switched off

        oflameron.Listen Listen port

      End If

      DoEvents

    Loop

    End Sub
    You may choose the number of port yourself. The ports range from 1 up to 65535. However, some ports are reserved for some standard services. It is recommended to choose the number of a port unused by mail or telnet.
     One may indicate the number of a port in a program using several manners:
    
    Free ebook - select port 125, select Protocol 0-TCP
    Lets write the procedure of handling a request for connection.
    
    
Winsock
    
    Private Sub oflameron_ConnectionRequest(ByVal requestID As Long)
    oflameron.Close Listen close

    oflameron.Accept requestID Lets tap a Client with the number of his request

    End Sub
    Now Lets write the handler of requests received from the clients. We place Text1 in the field of the form TextBox. On TextBox we will write the incoming commands (text commands)
  
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    Private Sub oflameron_DataArrival(ByVal bytesTotal As Long)
    Dim Data As String

    oflameron.GetData Data

    Text1.Text = Data

    If Data = "END" Then End

    If Data = "NOTEPAD" Then Shell ("notepad.exe")

    End Sub
    
    It is sufficient for a simplest server part. Now one shall compile the project, for example, in the file Server.exe
    
    Compile    Compile
  
    Client
  
    Lets create a new EXE project. In the field of the form we place the text fields IP and Port. In the field IP there will be the IP address of the computer (one may start up the both parts on one computer), where the server part (that was developed above) is started up. Right away in the field Port one may set the number of the port which listens to the server application.
    
    Lets place the buttons and Winsock Control in the field of the form
    
    Winsock
    
    Buttons:
    
    Connect - Command1 CommandButton connect to Server
    Disconnect - Command2 CommandButton Server disconnect
    Send Message - Command3 CommandButton send message to Server in Text1.Text
    Load Notepad - Command4 CommandButton load Notepad.exe on Server
    Close Server - Command5 CommandButton Close Server.exe
    Lets determine IP-address of the computer where the client part is started up. It is more probably that you will write and debug the programs on one computer, therefore the working IP-addresses of the server and client parts will coincide. If the Server and a client are on the different computers connected to the network, one need to enter the IP of computer in the client part where the server is located.
    
    You may find out the IP-address of computer by using the command ipconfig all
    
    Lets write the procedure of determining the IP-address of the computer
    Private Sub Form_Load()
    IP.Text = wsock.LocalIP

    End Sub
    
    Lets will write the procedures for buttons
    Connect - Command1 CommandButton connect to Server
    Private Sub Command1_Click()  - START YOUR WORK BY PRESSING IT!!!!
    wsock.Close Connections close

    wsock.RemoteHost = IP IP-address of Server

    wsock.RemotePort = Port The number of the port is set in Port.Text (TextBox) - 125

    wsock.Connect Set connection

    End Sub
    Disconnect Command2 CommandButton Server disconnect
    Private Sub Command2_Click()
    wsock.Close ''Close connection

    End Sub
    Send Message Command3 CommandButton To send a message to the Server in Text1.Text
    Private Sub Command3_Click()
    If wsock.State <> sckConnected Then Exit Sub

    wsock.SendData

    End Sub
    Load Notepad Command4 CommandButton load Notepad.exe on Server
    Private Sub Command4_Click()
    If wsock.State <> sckConnected Then Exit Sub

    wsock.SendData "NOTEPAD"

    End Sub
    Close Server Command5 CommandButton Server.exe close
    Private Sub Command5_Click()
    If wsock.State <> sckConnected Then Exit

    wsock.SendData "END"

    End Sub
    It is sufficient for a simplest client part. Now one shall compile the project, for example, in the file Client.exe
    The full VB-projects of the server and client parts are in the file vbnetv.zip
    
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Visual Basic TCP Cliet-Server


     Free Visual Basic and Winsock ebook. Free ebook - TCP client - server


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