怎样使用这几个函数？

[cengyu]

我不是很清楚memcpy();memset()以及相关的以mem开头的函数的用法，谁能够告诉我他们的具体用法？谢谢！

[earthharp]

void *memcpy(
void *dest,
const void *src,
size_t count
);
wchar_t *wmemcpy(
wchar_t *dest,
const wchar_t *src,
size_t count
);
Parameters
dest
New buffer.
src
Buffer to copy from.
count
Number of characters to copy.
Return Value
The value of dest.

Remarks
Copies count bytes of src to dest. If the source and destination overlap, this function does not ensure that the original source bytes in the overlapping region are copied before being overwritten. Use memmove to handle overlapping regions.

================================================================
void *memset(
void *dest,
int c,
size_t count
);
wchar_t *wmemset(
wchar_t *dest,
wchar_t c,
size_t count
);
Parameters
dest
Pointer to destination.
c
Character to set.
count
Number of characters.
Return Value
The value of dest.

Remarks
Sets the first count bytes of dest to the character c.

[sayo]

void *memcpy( void *dest, const void *src, size_t count );
void *memset( void *dest, int c, size_t count );
size_t i = sizeof( ... );
... ...

查看以下msdn吧