What is WSAStartup?
The WSAStartup function must be the first Windows Sockets function called by an application or DLL. It allows an application or DLL to specify the version of Windows Sockets required and retrieve details of the specific Windows Sockets implementation.
What is Winsock H?
Fd_set structure is used by Windows Sockets (Winsock) functions and service providers to place sockets into a set. Maintains information about a specific socket that specifies how that socket should behave when data is queued to be sent and the closesocket function is called on the socket.
What is Wsadata C++?
WSADATA structure is version 2.2 encoded with the major version number in the low-byte and the minor version number in the high-byte. This version of the current Winsock DLL, Ws2_32. dll, supports applications that request any of the following versions of the Windows Sockets specification: 1.0.
What is Wsadata used for?
1 Answer. WSAStartup has two main purposes. Firstly, it allows you to specify what version of WinSock you want to use (you are requesting 2.2 in your example). In the WSADATA that it populates, it will tell you what version it is offering you based on your request.
What is Invalid_socket?
INVALID_SOCKET is used for functions which return a SOCKET , which a pointer (much like a HANDLE ). On 32-bit systems it will be a 32-bit value, while on 64-bit systems it will be a 64-bit value. When properly cast to an integer of equivalent size, that will be the same as -1 .
What is WSACleanup?
When WSACleanup is called, any pending blocking or asynchronous Windows Sockets calls issued by any thread in this process are canceled without posting any notification messages or without signaling any event objects.
What is Ws2tcpip H?
The Winsock2. h header file contains most of the Winsock functions, structures, and definitions. The Ws2tcpip. h header file contains definitions introduced in the WinSock 2 Protocol-Specific Annex document for TCP/IP that includes newer functions and structures used to retrieve IP addresses.
What is Winsock application?
A Windows sockets (Winsock) is an application programming interface (API) that allows for communication between Windows network software and network services, such as Transmission Control Protocol/Internet Protocol (TCP/IP). Winsock is based on the Berkeley Unix sockets interface.
What is a socket C++?
Socket programming in C++ is the way of combining or connecting two nodes with each other over a network so that they can communicate easily without losing any data. Every time a socket is created, the program has to specify the socket type as well as the domain address.
What is Socket_error?
A socket error is when there is a problem with the user’s computer or the other computer or server while making this connection. There are more than 100 socket errors, but they all boil down to similar problems on either side of the connection. Socket errors are typically associated with failing internet connections.
What is Makeword?
Roughly speaking, MAKEWORD(x,y) is equivalent to ((y) << 8 | (x)) ; this is useful when packing two byte-sized values into a single 16-bit field, as often happens with general-purpose message structures.
What is #include Ws2tcpip H?
The Ws2tcpip. h header file contains definitions introduced in the WinSock 2 Protocol-Specific Annex document for TCP/IP that includes newer functions and structures used to retrieve IP addresses. Stdio. h is used for standard input and output, specifically the printf() function.