Get the function of native IP

Create a new Win32 console program with the following code:

#include <winsock2.h>

#include <stdio.h>

void Getlocalip ();

int main ()

{

Getlocalip ();

return 0;

}

void Getlocalip ()

{

Char chostname[256] = {0};

WORD wversionrequested;

Wsadata Wsadata;

int err;

wversionrequested = Makeword (2, 2);

Err = WSAStartup (wversionrequested, &wsadata);

if (err! = 0)

{

Return

}

if (GetHostName (chostname, up) = = Socket_error)

{

Return

}

struct Hostent * phe = gethostbyname (chostname);

if (phe = = NULL)

{

Return

}

if (phe->h_addr_list[0] = = 0)

{

Return

}

struct IN_ADDR addr;

memcpy (&ADDR, phe->h_addr_list[0], sizeof (struct in_addr));

DWORD dw1=inet_addr (Inet_ntoa (addr));

WORD Wd1=loword (DW1);//Fetch high 16 bits

WORD Wd2=hiword (DW1);//Take down 16 bits

BYTE Bte1=lobyte (WD1);

BYTE Bte2=hibyte (WD1);

BYTE Bte3=lobyte (WD2);

BYTE Bte4=hibyte (WD2);

printf ("%d.%d.%d.%d", bte1,bte2,bte3,bte4);

}

Normal conditions can be directly compiled and run, if encountered LNK2001, unresolved external symbols: Error, add Ws2_32.lib to the project properties [linker]->[command line] additional option and recompile.

This article is from the "adwen2010" blog, make sure to keep this source http://adwen2010.blog.51cto.com/1820717/1584334

Get the function of native IP