Q> Как узнать какие пользователи есть на моей (или не моей) машине
A>

#define STRICT
#include <windows.h>
#include <lm.h>
#include <iostream.h>
#include <tchar.h>

void UserEnum()
{
BOOL keepGoing = TRUE ;
DWORD entriesRead, totalEntries ;
USER_INFO_2 * pInfo = NULL ;
DWORD resumeHandle = 0 ; // must be 0 to start with
char nameBuf[ UNLEN + 1 ] ; // constants defined in LMCONS.H
char commentBuf[ MAXCOMMENTSZ + 1 ] ;
WCHAR serverName[ 100 ] ;
lstrcpyW( serverName, L"\\\\PDC" ) ; //L"" ) ;
while ( keepGoing )
{
NET_API_STATUS ret = NetUserEnum(
serverName, //NULL,
2,
0, //FILTER_NORMAL_ACCOUNT,
(LPBYTE *)&pInfo, // Important: ADDRESS of POINTER
sizeof( USER_INFO_2 ) * 100, // requested buffer size;
&entriesRead,
&totalEntries,
&resumeHandle ) ;

keepGoing = ( ret == ERROR_MORE_DATA ) ;

if ( ret == 0 || ret == ERROR_MORE_DATA )
{
DWORD i ;
for ( i = 0 ; i < entriesRead ; i++ )
{
// Note that strings in the INFO structures
// will ALWAYS be Unicode, regardless of
// your settings! Even though they're declared
// as LPTSTR, they're always LPWSTR.
// I'm compiling for non-Unicode, so I
// convert them to ANSI strings...
// Check for NULL pointers in the INFO structure
LPWSTR pName = (LPWSTR)pInfo[ i ].usri2_name ;
LPWSTR pComm = (LPWSTR)pInfo[ i ].usri2_comment ;
if ( pName == NULL )
{
lstrcpy( nameBuf, "(no name!)" ) ;
}
else if ( lstrlenW( pName ) == 0 )
{
lstrcpy( nameBuf, "(empty name!)" ) ;
}
else
{
WideCharToMultiByte( CP_ACP, 0,
pName, -1,
nameBuf, UNLEN,
NULL, NULL ) ;
}
if ( pComm == NULL )
{
lstrcpy( commentBuf, "(no comment!)" ) ;
}
else if ( lstrlenW( pComm ) == 0 )
{
lstrcpy( commentBuf, "(empty comment!)" ) ;
}
else
{
WideCharToMultiByte( CP_ACP, 0,
pComm, -1,
commentBuf, MAXCOMMENTSZ,
NULL, NULL ) ;
}
cout << nameBuf << ": " << commentBuf << endl ;
}
}
else
{
cout << "NetUserEnum error " << ret << endl ;
}

if ( pInfo )
{
NetApiBufferFree( pInfo ) ;
pInfo = NULL ;
}
}
}