memcpy, wmemcpy

Статья
10/16/2008

Copies bytes between buffers. More secure versions of these functions are available; see memcpy_s, wmemcpy_s.

void *memcpy(
   void *dest,
   const void *src,
   size_t count 
);
wchar_t *wmemcpy(
   wchar_t *dest,
   const wchar_t *src,
   size_t count
);

Параметры

dest
New buffer.
src
Buffer to copy from.
count
Number of characters to copy.

Возвращаемое значение

The value of dest.

Заметки

memcpy copies count bytes from src to dest; wmemcpy copies count wide characters (two bytes). If the source and destination overlap, the behavior of memcpy is undefined. Use memmove to handle overlapping regions.

Security Note Make sure that the destination buffer is the same size or larger than the source buffer. For more information, see Avoiding Buffer Overruns.

The memcpy and wmemcpy functions will only be deprecated if the constant _CRT_SECURE_DEPRECATE_MEMORY is defined prior to the inclusion statement in order for the functions to be deprecated, such as in the example below:

#define _CRT_SECURE_DEPRECATE_MEMORY
#include <memory.h>

#define _CRT_SECURE_DEPRECATE_MEMORY
#include <wchar.h>

Требования

Routine	Required header
memcpy	<memory.h> or <string.h>
wmemcpy	<wchar.h>

For additional compatibility information, see Compatibility in the Introduction.

Пример

See memmove for a sample of how to use memcpy.

См. также

Основные понятия

strcpy, wcscpy, _mbscpy

strncpy, _strncpy_l, wcsncpy, _wcsncpy_l, _mbsncpy, _mbsncpy_l

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