Simple Winsock Tutorial
This is a short and to the point winsock tutorial. Pleae note this only covers tranferring text between two computers. Nothing more.
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<html> <head> <title>Winsock Tutorial</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> <p> </p> <p><font size="4"><b>WINSOCK TUTORIAL</b></font></p> <p> </p> <p><font face="Arial, Helvetica, sans-serif">Ok, heres how to use the Winsock control included with Visual Basic. </font></p> <p><font face="Arial, Helvetica, sans-serif">First add a Winsock control to a blank form, and then add two command buttons to the form. <br> Double click one of the command buttons and insert the following code:<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">Private Sub Command1_Click()<br> Winsock1.Connect "localhost", 3000<br> End Sub<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">This code simply tells the Winsock control to connect to the IP of your computer (if you wanted to connect to another computer you would substitute localhost for the IP of the computer you wanted to connect to). This code also sets the port to connect on. Something above 3000 is good because below this there is alot of service port used by windows eg. netbios<br> Now double click the other command button and add the following code:<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">Private Sub Command2_Click()<br> Winsock1.SendData "hello this is a test"<br> End Sub<br> <br> This bit of code is self-explanatory. It sends whatever you tell it.<br> Right.... we've now coded the client program. Now for the server. Minimize the project you've just created and start a new one. <br> Double click on the form and choose the Form_Activate event. Insert the code like this:<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">Private Sub Form_Activate()<br> Winsock1.LocalPort = 3000<br> Winsock1.Listen<br> End Sub<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">This code defines the port to listen on and sets the Winsock controls state to listen.<br> Now insert this code:<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">Private Sub Winsock1_ConnectionRequest(ByVal requestID As Long)<br> Winsock1.Close<br> Winsock1.Accept requestID<br> End Sub<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">This code accepts a connection.<br> Add this code as well: <br> </font></p> <p><font face="Arial, Helvetica, sans-serif">Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)<br> Dim n As String<br> Winsock1.GetData n<br> MsgBox n<br> End Sub<br> </font></p> <p><font face="Arial, Helvetica, sans-serif">This code gets the data received from the other program when you click command2. Please not you <b>must declare the variable used to store the data you got. </b> If you do not you will just get ? Marks. </font></p> <p><font face="Arial, Helvetica, sans-serif">Now run both of the programs and click the first command button to connect and the second one to send data to the other program. The other program should show the message you told the first program to send.</font></p> <p> </p> <p></p> <p><font face="Arial, Helvetica, sans-serif"><br> </font> </p> </body> </html>
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