WSANtohs function

The WSANtohs function converts a u_short from network byte order to host byte order.

Syntax

int WSAAPI WSANtohs(
  SOCKET  s,
  u_short netshort,
  u_short *lphostshort
);

Parameters

s

A descriptor identifying a socket.

netshort

A 16-bit number in network byte order.

lphostshort

A pointer to a 16-bit number to receive the number in host byte order.

Return Value

If no error occurs, WSANtohs returns zero. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

Error code Meaning
WSANOTINITIALISED
A successful WSAStartup call must occur before using this function.
WSAENETDOWN
The network subsystem has failed.
WSAENOTSOCK
The descriptor is not a socket.
WSAEFAULT
The lphostshort parameter is NULL or the address pointed to is not completely contained in a valid part of the user address space.

Remarks

The WSANtohs function takes a 16-bit number in network byte order and returns a 16-bit number in host byte order in the 16-bit number pointed to by the lphostshort parameter. The socket passed in the s parameter is used to determine the network byte order required based on the Winsock catalog protocol entry associated with the socket. This feature supports Winsock providers that use different network byte orders.

If the socket is for the AF_INET or AF_INET6 address family, the WSANtohs function can be used to convert an IP port number in network byte order to the IP port number in host byte order.

The WSANtohs function requires that the Winsock DLL has previously been loaded with a successful call to the WSAStartup function. For use with the AF_INET OR AF_INET6 address family, the ntohsfunction does not require that the Winsock DLL be loaded.

Windows Phone 8: This function is supported for Windows Phone Store apps on Windows Phone 8 and later.

Windows 8.1 and Windows Server 2012 R2: This function is supported for Windows Store apps on Windows 8.1, Windows Server 2012 R2, and later.

Requirements

   
Minimum supported client Windows 8.1, Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2003 [desktop apps | UWP apps]
Target Platform Windows
Header winsock2.h
Library Ws2_32.lib
DLL Ws2_32.dll

See Also

InetNtop

WSAHtonl

WSAHtons

WSANtohl

Winsock Functions

Winsock Reference

htonl

htons

inet_addr

inet_ntoa

ntohl

ntohs