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#pragma comment(lib, "Secur32")//в bcb наверно #pragma link Secur32.lib
#define SECURITY_WIN32//еррор дефайненый в Security.h : you must define blah-blah SECURITY_WIN32, SECURITY_ещёчетотам, SECURITY_третий_вариант
#include <Security.h>//тут объявлен GetUserNameEx
//формат такой: bool GetUserNameEx(http://msdn.microsoft.com/en-us/library/ms724268%28v=vs.85%29.aspx,wchar_t* результат,&int размер)
//дальше код примера из MSVSC++:

#include "stdafx.h"
#include <windows.h>
#include <tchar.h>
#include <stdio.h>

TCHAR* envVarStrings[] =
{
  TEXT("OS         = %OS%"),
  TEXT("PATH       = %PATH%"),
  TEXT("HOMEPATH   = %HOMEPATH%"),
  TEXT("TEMP       = %TEMP%")
};
#define  ENV_VAR_STRING_COUNT  (sizeof(envVarStrings)/sizeof(TCHAR*))
#define INFO_BUFFER_SIZE 32767
void printError( TCHAR* msg );

void main( )
{
  DWORD i;
  TCHAR  infoBuf[INFO_BUFFER_SIZE];
  DWORD  bufCharCount = INFO_BUFFER_SIZE;
 
  // Get and display the name of the computer.
  bufCharCount = INFO_BUFFER_SIZE;
  if( !GetComputerName( infoBuf, &bufCharCount ) )
    printError( TEXT("GetComputerName") );
  _tprintf( TEXT("\nComputer name:      %s"), infoBuf );
 
  // Get and display the user name.
  bufCharCount = INFO_BUFFER_SIZE;
  if( !GetUserName( infoBuf, &bufCharCount ) )
    printError( TEXT("GetUserName") );
  _tprintf( TEXT("\nUser name:          %s"), infoBuf );
  if( !GetUserNameEx(NameDisplay,infoBuf, &bufCharCount ) )
    printError( TEXT("GetUserNameEx") );
  _tprintf( TEXT("\nUser display:          %s"), infoBuf );
 
  // Get and display the system directory.
  if( !GetSystemDirectory( infoBuf, INFO_BUFFER_SIZE ) )
    printError( TEXT("GetSystemDirectory") );
  _tprintf( TEXT("\nSystem Directory:   %s"), infoBuf );
 
  // Get and display the Windows directory.
  if( !GetWindowsDirectory( infoBuf, INFO_BUFFER_SIZE ) )
    printError( TEXT("GetWindowsDirectory") );
  _tprintf( TEXT("\nWindows Directory:  %s"), infoBuf );
 
  // Expand and display a few environment variables.
  _tprintf( TEXT("\n\nSmall selection of Environment Variables:") );
  for( i = 0; i < ENV_VAR_STRING_COUNT; ++i )
  {
    bufCharCount = ExpandEnvironmentStrings(envVarStrings, infoBuf,
        INFO_BUFFER_SIZE );
    if( bufCharCount > INFO_BUFFER_SIZE )
      _tprintf( TEXT("\n\t(Buffer too small to expand: \"%s\")"),
              envVarStrings );
    else if( !bufCharCount )
      printError( TEXT("ExpandEnvironmentStrings") );
    else
      _tprintf( TEXT("\n   %s"), infoBuf );
  }
  _tprintf( TEXT("\n\n"));
}

void printError( TCHAR* msg )
{
  DWORD eNum;
  TCHAR sysMsg[256];
  TCHAR* p;

  eNum = GetLastError( );
  FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM |
         FORMAT_MESSAGE_IGNORE_INSERTS,
         NULL, eNum,
         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
         sysMsg, 256, NULL );

  // Trim the end of the line and terminate it with a null
  p = sysMsg;
  while( ( *p > 31 ) || ( *p == 9 ) )
    ++p;
  do { *p-- = 0; } while( ( p >= sysMsg ) &&
                          ( ( *p == '.' ) || ( *p < 33 ) ) );

  // Display the message
  _tprintf( TEXT("\n\t%s failed with error %d (%s)"), msg, eNum, sysMsg );
}