EIP和目标地址的关系

E9指令就是JMP指令EIP+E9指令后的偏移量=目标地址EIP=当前地址（E9指令地址）+加上当前代码长度（字节）（E9指令长度）=下一个执行代码的地址偏移量=目标地址-（E9指令地址+E9指令长度）=目标地址-E9指令地址-E9指令长度例：void HookAllAttack(){  LPVOID adr = (LPVOID)0x0063011F;  DWORD offset = (DWORD)IsAttack - (DWORD)adr - 5;  BYTE code[5];  code[0]=0xe9;//jmp  *PDWORD(code + 1) = offset;  DWORD oldprotect;  if(VirtualProtect(adr,5,PAGE_EXECUTE_READWRITE,&oldprotect))  {    memcpy(adr,code,5);    VirtualProtect(adr,5,oldprotect,&oldprotect);  }}