内存拷贝，实现程序自身代码复制。

#include  
#include  
#include 
using namespace std;
#define BUFFER_SIZE 4096 

void *MemAddr = NULL;
int _tmain(int argc, _TCHAR* argv[])
{
　　copyself();
    getchar();
    return 0; 

}

void copyself( ) 
{ 
    MemAddr = VirtualAlloc(NULL, BUFFER_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE); 
    memcpy(MemAddr, (void *)_tmain, BUFFER_SIZE); 
}