弯路钩memcpy不工作程序停止工作

Question

当我将这个dll注入程序时，程序在遇到函数memcpy时崩溃。

我想用弯道钩住函数memcpy。 请帮助。

#include <windows.h>
#include<iostream>
#include "detours\detours.h"

#pragma comment( lib, "msvcrt.lib" )
#pragma comment( lib, "detours.lib" )
void * (__cdecl *memcpy_o)(void *dest, const void *src, size_t count);


void* __cdecl Mine_Memcpy(void *dest, const void *src, size_t count) {
    char cislo[24]; // just big enough
    void* asd = &memcpy;
    sprintf(cislo,"0x%08x", &asd);

    MessageBoxA(0, cislo, cislo, 0);

    return memcpy_o(dest, src, count);

}


BOOL WINAPI DllMain(HINSTANCE, DWORD dwReason, LPVOID) {

    HANDLE memcpy_get = GetProcAddress(GetModuleHandleA("msvcrt"), "memcpy");
    switch (dwReason) {
    case DLL_PROCESS_ATTACH:
        DetourTransactionBegin();
        DetourUpdateThread(GetCurrentThread());
        memcpy_o = (void * (__cdecl *)(void *dest, const void *src, size_t count))DetourAttach(&(PVOID&)memcpy_get, Mine_Memcpy);
        DetourTransactionCommit();
        break;

    case DLL_PROCESS_DETACH:
        DetourTransactionBegin();
        DetourUpdateThread(GetCurrentThread());
        DetourDetach(&(PVOID &)memcpy_o, Mine_Memcpy);
        DetourTransactionCommit();
        break;
    }

    return TRUE;
}

我将这个dll注入程序。什么时候使用mecpy程序停止工作请帮忙，哪里出错？