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Asked: 2026-05-15T06:00:58+00:00

Why does ZeroMemory() , and similar calls exist in the Windows API when there

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Why does ZeroMemory(), and similar calls exist in the Windows API when there are memset and related calls in the C standard library already? Which ones should I call? I can guess the answer is “depends”. On what?

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1 Answer

  1. Editorial Team

    In C and C++, ZeroMemory() and memset() are the exact same thing.

    /* In winnt.h */
#define RtlZeroMemory(Destination,Length) memset((Destination),0,(Length))

/* In winbase.h */
#define ZeroMemory RtlZeroMemory

    Why use ZeroMemory() then? To make it obvious. But I prefer memset() in C or C++ programs.

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