#include <winsock2.h>

AnsiString out = "WinSock ERR";
WSADATA wsaData; 
if (!WSAStartup(WINSOCK_VERSION, &wsaData)){char chInfo[64];
if (!gethostname(chInfo, sizeof(chInfo)))
{
hostent *sh;
sh=gethostbyname((char*)&chInfo);
if (sh!=NULL)
{
int nAdapter = 0;
while (sh->h_addr_list[nAdapter])
{
struct sockaddr_in adr;
memcpy(&adr.sin_addr, sh->h_addr_list[nAdapter], sh->h_length);
out = inet_ntoa(adr.sin_addr);
nAdapter++;
}
}
}
}
WSACleanup();
ShowMessage(out);