windows sockets编程（windows sockets编程）.docVIP

windows sockets编程（windows sockets编程） For the convenience of network programming, the beginning of the 90s, by Microsoft combined with several other companies jointly developed a set of network programming interface under WINDOWS, namely Windows Sockets specification, it is not a kind of network protocol, but an open, multi protocol support of Windows network programming interface. The Winsock is now basically implemented without protocol, and you can use Winsock to call multiple protocols, but the TCP/IP protocol is more often used. Socket actually provides a communication port in the computer that can communicate with any computer with the Socket interface through this port. The application is transmitted over the network and the received information is implemented through the Socket interface. Several basic concepts are introduced, synchronous (Sync) / asynchronous (Async), blocked (Block) / non blocking (Unblock). Synchronous mode refers to the sender receiver range response, and then sending a data packet communication; asynchronous data refers to the sender issued after received from the receiver response, communication way sending a data packet. Refers to the execution of this blocking socket socket network call, did not return until success, otherwise this network has been blocking calls, such as call recv () function to read network buffer data, if there is no data to arrive, will always be in the (recv) this function call, until I read some data, call this function returns; and a non blocking socket refers to the execution of the socket network calls, regardless of whether it succeeds, will return immediately. For example, call the recv () function to read data from the network buffer, and then return immediately, regardless of whether the data is read, rather than hanging on the function call. In the actual Windows network communication software development, asynchronous non blocking sockets are the most used. The software of the C/S (client / server) stru