Expand Minimize

ntohl function

The ntohl function converts a u_long from TCP/IP network order to host byte order (which is little-endian on Intel processors).

Syntax


u_long WSAAPI ntohl(
  _In_  u_long netlong
);

Parameters

netlong [in]

A 32-bit number in TCP/IP network byte order.

Return value

The ntohl function returns the value supplied in the netlong parameter with the byte order reversed. If netlong is already in host byte order, then this function will reverse it. It is up to the application to determine if the byte order must be reversed.

Remarks

The ntohl function takes a 32-bit number in TCP/IP network byte order (the AF_INET or AF_INET6 address family) and returns a 32-bit number in host byte order.

The ntohl function can be used to convert an IPv4 address in network byte order to the IPv4 address in host byte order. This function does not do any checking to determine if the netlong parameter is a valid IPv4 address.

The ntohl function does not require that the Winsock DLL has previously been loaded with a successful call to the WSAStartup function.

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 only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Winsock2.h

Library

Ws2_32.lib

DLL

Ws2_32.dll

See also

htond
htonf
htonl
htonll
htons
inet_addr
inet_ntoa
InetNtop
InetPton
ntohd
ntohf
ntohs
WSAHtonl
WSAHtons
WSANtohl
WSANtohs

 

 

Community Additions

ADD
Show:
© 2014 Microsoft