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C-/C++-Quelltext

#include <conio.h>
#include <windows.h>
#include <tchar.h>

#pragma comment( lib, "Ws2_32.lib" )

#if _UNICODE
#define myprintf wprintf
#else
#define myprintf printf
#endif

static inline void WSockCheckError( const PTCHAR func, int line )
{
    int errorcode = WSAGetLastError();

    if ( errorcode != 0 )
        myprintf( _T( "Error: %d at %s (%d)\n" ), errorcode, func, line );
}

#if 1
#define WSACALL( funcCall ) funcCall, WSockCheckError(  #funcCall, __LINE__ )
#else
#define WSACALL( funcCall ) funcCall
#endif

int main()
{
    WSADATA wsaData;
    TCHAR buffer[ 512 ] = { 0 };
    hostent* entp;

    WSACALL( WSAStartup( MAKEWORD( 2, 2 ), &wsaData ) );
    WSACALL( gethostname( buffer, sizeof( buffer ) * sizeof( buffer[0] ) ) );
    entp = WSACALL( gethostbyname( buffer ) );
    WSACALL( WSACleanup() );

    myprintf( _T( "Host: %s\n" ), buffer );

    for ( int i = 0; entp->h_addr_list[i]; ++i )
    {
        in_addr address;
        memcpy( &address, entp->h_addr_list[i], sizeof( in_addr ) );
        myprintf( _T( "  IP%d: %s\n" ), i, inet_ntoa( address ) );
    }

    _getch();
}