InetNtop: can't find which header it is using - c++

Question

Anyone knows what header I must include for the use of InetNtop function ?
I tried winsock2.h, ws2tcpip.h and i've include the Ws2_32 librabry. I am using windows 7
This is my error that i get an compile time: InetNtop : function could not be resolved
edit:
char temp[10];
int bytes_recv = Recv(temp, sizeof(temp));
char result[INET_ADDRSTRLEN];
InetNtop(AF_INET, (void*)(&temp[4]), result, sizeof(result));
I am trying to print an IP what is in temp.

Answer 1

Not 100% relevant, but for the linux/unix version of this call (inet_ntop(...)), you need to #include <arpa/inet.h>.

Answer 2

According to its documentation Ws2tcpip.h is its actual header file.
EDIT:
According to the documentation, using this function requires your code to be compiled for Windows Vista or later. Since you are including the necessary header and yet the function is not visible, I surmise the you have not set the proper defines or compiler options to compile your code for a suitable version.
The actual Windows version that you are using is not important - what you are compiling for (i.e. the target version) is.
EDIT 2:
You should add the proper #define directive as described here to indicate which Windows version you are compiling for. E.g.
#include <SdkDdkver.h>
#define NTDDI_VERSION NTDDI_VISTA
#define WINVER _WIN32_WINNT_VISTA
#define _WIN32_WINNT _WIN32_WINNT_VISTA
Some of these defines overlap and may not be needed, but on the rare times that I code for Windows I just use them all to make sure :-)
EDIT 3:
Things are a bit different for MinGW/GCC:
#include <w32api.h>
#define WINVER WindowsVista
#define _WIN32_WINDOWS WindowsVista
#define _WIN32_WINNT WindowsVista
Note: These defines should be placed before including Windows.h or any other header but w32api.h.
EDIT 4:
From the WS2tcpip.h in Visual Studio 2010:
#if (NTDDI_VERSION >= NTDDI_VISTA)
.
.
.
PCSTR
WSAAPI
inet_ntop(
__in INT Family,
__in PVOID pAddr,
__out_ecount(StringBufSize) PSTR pStringBuf,
__in size_t StringBufSize
);
PCWSTR
WSAAPI
InetNtopW(
__in INT Family,
__in PVOID pAddr,
__out_ecount(StringBufSize) PWSTR pStringBuf,
__in size_t StringBufSize
);
#define InetPtonA inet_pton
#define InetNtopA inet_ntop
#ifdef UNICODE
#define InetPton InetPtonW
#define InetNtop InetNtopW
#else
#define InetPton InetPtonA
#define InetNtop InetNtopA
#endif
.
.
.
#endif // (NTDDI_VERSION >= NTDDI_VISTA)
Therefore the critical define in this case is NTDDI_VERSION, as expected for a new API addition.
I cannot find the InetNtop definition in MinGW32/GCC-4.4.2, so it's quite possible that it is not supported in your version either.

Answer 3

Although it exists in Ws2tcpip.h, the default target for most projects is Windows XP, and the function you are trying to use was introduced in Vista, so, you need to configure your project to target Vista instead. There are at least three things you can do here:
In your stdafx.h (if you have one), find the definitions of WINVER and _WIN32_WINNT [by default these are both 0x0501], change them both to 0x0600. Windows 7 is 0x0601. Also, define NTDDI_VERSION to 0x06000000.
If you don't have a stdafx.h header, add these definitions to your project's C/C++ preprocessor settings (WINVER=0x0600,_WIN32_WINNT=0x0600,NTDDI_VERSION=0x06000000).
As a last resort, define these manually before including any headers for that particular source file:
#ifndef WINVER
#define WINVER 0x0600
#endif
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif
#ifndef NTDDI_VERSION
#define NTDDI_VERSION 0x06000000
#endif
#include <windows.h>
#include <Ws2tcpip.h>
Also, make sure you have an up-to-date copy of ws2tcpip.h. For example, the copy that comes with Visual Studio 2005 does not have a declaration for InetNtop.

Answer 4

Declare this function explicitly in your code.
const char *inet_ntop(int af, const void *src, char *dst, socklen_t size)
{
struct sockaddr_storage ss;
unsigned long s = size;
ZeroMemory(&ss, sizeof(ss));
ss.ss_family = af;
switch(af) {
case AF_INET:
((struct sockaddr_in *)&ss)->sin_addr = *(struct in_addr *)src;
break;
case AF_INET6:
((struct sockaddr_in6 *)&ss)->sin6_addr = *(struct in6_addr *)src;
break;
default:
return NULL;
}
/* cannot direclty use &size because of strict aliasing rules */
return (WSAAddressToString((struct sockaddr *)&ss, sizeof(ss), NULL, dst, &s) == 0)?
dst : NULL;
}

Answer 5

Looks like Ws2tcpip.h, see msdn.