槽技术核心

ZWindow* pThis = g_pWnd;
		pThis->m_hwnd = hwnd;
		pThis->Init(WndProc, pThis);
		WNDPROC WindowProcess = (WNDPROC)&(pThis->m_thunk);//就是this指针.
		SetWindowLong(hwnd, GWL_WNDPROC, (LONG)WindowProcess);//每个窗口类实例都改成它.
		return WindowProcess(hwnd, message, wParam, lParam);
wndclass.lpfnWndProc = ZWindow::StartWndProc;
//窗口类设置为起始.

参考地址在此
每个窗口创建时,收到消息置为新的过程函数.然后再发消息时,就往新的走了.