LPWSACOMPLETIONROUTINE

LPWSACOMPLETIONROUTINE is a function pointer type defined in the Windows Sockets API (Winsock). It represents a callback function that is invoked by Winsock when an asynchronous socket operation completes. When an application initiates an asynchronous operation, such as a send, receive, or accept, it can provide a pointer to an LPWSACOMPLETIONROUTINE function. This routine is then called by the system once the operation has finished, whether successfully or with an error.

The LPWSACOMPLETIONROUTINE callback function typically receives several parameters, including the status of the operation, the number of bytes transferred, and a pointer to the context data that was specified when the asynchronous operation was initiated. The primary purpose of this callback mechanism is to allow applications to handle the results of asynchronous operations in a non-blocking manner. Instead of polling for completion, the application can continue with other tasks and be notified by Winsock when the operation is done. This is a fundamental component for building efficient, high-performance network applications using Winsock's asynchronous I/O capabilities.