修改函数的第一，第六，第七字节实现函数跳转(利用汇编语言)

#include <iostream>
#include <windows.h>
using namespace std;

void new_func()
{
 cout << "new_func" << endl;
}

int main()
{
 char pNewFuncAddr[7] = { '/0' };
 pNewFuncAddr[0] = (char)0xB8;
 DWORD dwAddr = (DWORD)new_func;
 memcpy(pNewFuncAddr+1,&dwAddr,sizeof(DWORD));
 pNewFuncAddr[5] = (char)0xFF;
 pNewFuncAddr[6] = (char)0xE0;
 /**********************
  b8 9c 5e 41 00 ff e0
  **********************/
 /*
 (*(void)(*)()(&pNewFuncAddr))();
 转换有局限性:void(*)()
 */
 _asm
 {
  lea eax,[pNewFuncAddr];
  call eax;
 }
 /*****************************
  lea eax,[pNewFuncAddr]
  call eax                               
  *****************************
      ||
    / || /
     ////
      //
  *************************
  b8 mov eax 
  9c         
  5e                     
  41    00415e9c         
  00      
  ff e0 jmp eax          
  *************************/

 return 0;
}