How to Look Up a User's Full Name

Computers running Windows can be organized into a domain, which is a collection of computers on a Windows NT Server network. The domain administrator maintains centralized user and group account information.

To find the full name of a user, given the user name and domain name on Windows NT:

  • Convert the user name and domain name to Unicode, if they are not already Unicode strings.

  • Look up the computer name of the domain controller (DC) by calling NetGetDCName.

  • Look up the user name on the DC computer by calling NetUserGetInfo.

  • Convert the full user name to ANSI, unless the program is expecting to work with Unicode strings.

The following sample code is a function that takes a user name and a domain name in the first two arguments and returns the user's full name in the third argument.

#include <windows.h>

#include <lm.h>

#include <stdio.h>

BOOL GetFullName( char *UserName, char *Domain, char *dest )


WCHAR wszUserName[256]; // Unicode user name

WCHAR wszDomain[256];

LPBYTE ComputerName;

struct _SERVER_INFO_100 *si100; // Server structure

struct _USER_INFO_2 *ui; // User structure

// Convert ANSI user name and domain to Unicode

MultiByteToWideChar( CP_ACP, 0, UserName,

strlen(UserName)+1, wszUserName, sizeof(wszUserName) );

MultiByteTOWideChar( CP_ACP, 0, Domain,

strlen(Domain)+1, wszDomain, sizeof(wszDomain) );

// Get the computer name of a DC for the domain.

NetGetDCName( NULL, wszDomain, &ComputerName );

// Look up the user on the DC.

if( NetUserGetInfo( (LPWSTR) ComputerName,

(LPWSTR) &wszUserName, 2, (LPBYTE *) &ui ) )


printf( "Error getting user information.\n" );

return( FALSE );


// Convert the Unicode full name to ANSI.

WideCharToMultiByte( CP_ACP, 0, ui->usri2_full_name, -1,

dest, 256, NULL, NULL );

return (TRUE);


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