请讲解copymemory这个函数 最好有个例子

MSDN是这样说的

VOID CopyMemory(
PVOID Destination, // pointer to address of copy destination
CONST VOID *Source, // pointer to address of block to copy
DWORD Length // size, in bytes, of block to copy
);

Parameters
Destination
Pointer to the starting address of the copied block's destination.
Source
Pointer to the starting address of the block of memory to copy.
Length
Specifies the size, in bytes, of the block of memory to copy.
Return Values
This function has no return value.