MultiByte和Unicode转换Sample(msdn)

#include <windows.h>
#include <lm.h>
#include <stdio.h>

BOOL GetFullName( char *UserName, char *Domain, char *dest )
{
    WCHAR wszUserName[UNLEN+1];          // 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)/sizeof(wszUserName[0]) );
    MultiByteToWideChar( CP_ACP, 0, Domain,
        strlen(Domain)+1, wszDomain, sizeof(wszDomain)/sizeof(wszDomain[0]) );

// 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);
}