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Checar se ponteiro é nulo


caion90

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não sei fazer isso, preciso da ajuda do forum...

NTSTATUS ZwCreateSection(
  __out     PHANDLE SectionHandle,
  __in      ACCESS_MASK DesiredAccess,
  __in_opt  POBJECT_ATTRIBUTES ObjectAttributes,
  __in_opt  PLARGE_INTEGER MaximumSize,
  __in      ULONG SectionPageProtection,
  __in      ULONG AllocationAttributes,
  __in_opt  HANDLE FileHandle
);
os __in_opt são opcionais, como faço para ver se eles estão ou não setados? já tentei
if (ObjectAttributes != 0x00), if (ObjectAttributes)...

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