RtlSizeHeap - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

NTSYSAPI
SIZE_T
NTAPI
RtlSizeHeap(
    _In_ PVOID HeapHandle,
    _In_ ULONG Flags,
    _In_ PVOID BaseAddress
    );

#endif

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Kernel32.dll HeapSize maps directly to RtlSizeHeap. See Ms SDK for definition.

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