将C++builder中的类成员函数当作windows回调函数

//16个字节汇编指令
#pragma pack(push) //保存对齐状态
#pragma pack(1)
struct TInstruction
{
     byte Code1[7];
     void *Self;
     byte Code2;
     void *Method;
};
#pragma pack(pop) //恢复对齐状态
typedef TInstruction * PInstruction ;
//改造回调函数
PInstruction MakeInstruction(TMethod &Method)
{
   //机器码使参数符合回调要求，然后又使之复合成员函数的调用要求
   byte Code[16] ={0xFF,0x34,0x24,0xC7,0x44,0x24,0x04,0x00,0x00,0x00,0x00,0xE9,0x00,0x00,0x00,0x00};

   PInstruction P;

   P = (PInstruction)malloc(sizeof(struct TInstruction));
   memmove(P,Code, 16);
   P->Self    = Method.Data;
   P->Method  = (void *)((long)(Method.Code)-(long(P)+sizeof(Code)));
   return P;
}
//类销毁时使用
void FreeInstruction(void *P)
{
   free(P);
}
//---------------------------------------------------------------------------
//定时器回调函数
TIMERPROC __stdcall TForm1::TimerProc(
  HWND hwnd,         // handle to window
  UINT uMsg,         // WM_TIMER message
  UINT_PTR idEvent,  // timer identifier
  DWORD dwTime       // current system time
)
{
   this->Caption = Now();
   KillTimer(hwnd,0);
}
void __fastcall TForm1::Button3Click(TObject *Sender)
{
    TMethod M;
    ShortString ProcName = "TimerProc";
    M.Code = MethodAddress(ProcName);
    M.Data = this;
    P1 = MakeInstruction(M);

    SetTimer(this->Handle,0,1000,(TIMERPROC)(P1));//定时器函数
}