LookupAccountNameA

function LookupAccountNameA(

  lpSystemName: LPCSTR;

  lpAccountName: LPCSTR;

  Sid: PSid;

  var cbSid: DWORD;

  ReferencedDomainName: LPSTR;

  var cchReferencedDomainName: DWORD;

  var peUse: SID_NAME_USE

):BOOL;