ntohl function (winsock2.h)
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
[in] netlong
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
| Requirement | Value |
|---|---|
| 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 (include Winsock2.h) |
| Library | Ws2_32.lib |
| DLL | Ws2_32.dll |