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htonl function

The htonl function converts a u_long from host to TCP/IP network byte order (which is big-endian).

Syntax


u_long WSAAPI htonl(
  _In_  u_long hostlong
);

Parameters

hostlong [in]

A 32-bit number in host byte order.

Return value

The htonl function returns the value in TCP/IP's network byte order.

Remarks

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

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

The htonl 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
htonll
htons
inet_addr
inet_ntoa
InetNtop
InetPton
ntohd
ntohf
ntohll
ntohs
WSAHtonl
WSAHtons
WSANtohl
WSANtohs

 

 

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