I'm trying to use GetLastError API call to figure out why a call to LogonUser may have failed. However, no matter what I do, GetLastError always returns 0. LogonUser will return 1 when I enter a valid username/password. If I enter the same username with a bogus password, LogonUser returns a 0 indicating there was a problem but GetLastError() still returns a 0.

I've included my code below. Does anyone know what I might be doing wrong?

DECLARE integer GetLastError IN kernel32
DECLARE integer CloseHandle IN kernel32 integer hObject
DECLARE integer LogonUser IN advapi32 string lpzUser, string lpzDomain,;
  string lpzPass, integer dwLogonType, integer dwLogonProvider,;
  integer @phToken


nToken = 0

IF LogonUser("user_name","domain.com",INPUTBOX("Password:"),3,0,@nToken) = 0
   = MESSAGEBOX("Error: " + TRANSFORM(GetLastError(),"99999999"))
ELSE
   = CloseHandle(nToken)
ENDIF

RELEASE ALL

Thanks for your input!