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Winsock Tutorial5/9/2021
Some of the important properties of the control are as following.Winsock control comes with VB6 and is used to create applications that access the low-level functions of the Transmission Control ProtocolInternet Protocol (TCPIP).
![]() Winsock Tutorial Series Of LayersThe protocols in TCPIP are arranged in a series of layers known as a protocol stack.This standard is basically a set of routines that describe communications to and from the TCPIP stack. These routines reside in a dynamic link library that runs under Windows. The winsock DLL is interfaced with TCPIP and from there through the Internet. Both client and server will interact with each other to exchange data. Client will send a request to the server and the server which will be connected to a database will retrieve the information requested by the client from the database and will return the requested information back to the client. You will a database with this article, the database contains the item numbers and their prices. In real life situations, database might be located on a machine different from the one that hosts the client application. I think it would be better to talk about the ports before we proceed any further. A port is a special memory location that exists when two computers are in communication via TCPIP. Applications use a port number as an identifier to other computers, both the sending and receiving computers use this port to exchange data. To make the job of communication easier, some port numbers have been standardized. These standard port numbers have no inherent value other than that users have agreed to use them with certain applications. Table below lists a number of popular and publicly accepted port numbers and their corresponding applications. TCPIP is an industry standard communication protocol that defines methods for packaging data into packets for transmission between computing devices on a heterogeneous network. TCPIP is the standard for data transmission over networks, including the Internet. TCP establishes a connection for data transmission and IP defines the method for sending data packets. The Microsoft Winsock control makes using the TCPIP a breeze. Microsoft has wrapped up the Winsock and INetAPI API calls into a nice neat package that you can easily incorporate into your Visual Basic applications. The core protocols of the Transport layer are TCP and User Datagram Protocol (UDP). The Winsock control supports the following two operating modes. This dual functionality enables you to specify through property setting the type of application you will be building. The Winsock control uses a number of the same properties, whether you are creating client or a server, thereby all but eliminating the learning curve needed to create applications.
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