54. FAQ o Win API

Q> As, knowing a name and the password of the user and without having privileges for LogonUser (), 
Program to check up them on correctness? 

A> it is the Most simple to use NetUserChangePassword () 
(If it is authorized to user to change the password)

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

#pragma comment (lib, "netapi32") 

//------------------------------------------------ 
void main (void) 
{ 
char UserName [MAX_PATH]; 
char Password [MAX_PATH]; 
char CompName [MAX_PATH]; 

char tmp [MAX_PATH]; 
strcpy (tmp, "\\\\"); 
printf ("Computer:"); 
scanf ("%s", CompName); 

if (CompName [0]! = ' \\') 
{ 
strcat (tmp, CompName); 
strcpy (CompName, tmp); 
}

printf ("User Name:"); 
scanf ("%s", UserName); 

printf ("Password:"); 

	char ch; 
	UINT u=0; 

    do 
    { 

      ch = _getch (); 
if (ch == '\b ') 
{ 
_putch ('\b '); 
u-; 
}
else 
{ 
 
	  if (ch! = '\r ') _putch (' * '); 
	  Password [u] =ch; 
	  u ++; 
}
    } while (ch! = '\r '); 
	  printf ("\n"); 
      Password [- u] =0; u=0; 

	wchar_t wcompname [MAX_PATH]; 
	wchar_t wusername [MAX_PATH]; 
	wchar_t wpassword [MAX_PATH]; 

    mbstowcs (wcompname, CompName, strlen (CompName) +1); 
    mbstowcs (wusername, UserName, strlen (UserName) +1); 
    mbstowcs (wpassword, Password, strlen (Password) +1); 

switch (NetUserChangePassword (wcompname, wusername, wpassword, wpassword)) 
{ 
case ERROR_ACCESS_DENIED: 
	printf ("The user does not have access to the requested information.\n"); 
	break; 
case NERR_InvalidComputer: 
	printf ("The computer name is invalid.\n"); 
	break; 
case NERR_NotPrimary: 
	printf ("The operation is allowed only on the primary domain controler of the domain.\n"); 
	break; 
case NERR_UserNotFound: 
	printf ("The user name could not be found.\n"); 
	break; 
case NERR_PasswordTooShort: 
	printf ("The password is shorter than required.\n"); 
	break; 
case 0: 
	printf ("User Ok\n"); 
	break; 

default:printf ("Error\n");; 
}

}