关于消息?
如何处理SendMessage函数中wParam参数的高低位?
如消息: WM_VSCROLL
nScrollCode = (int) LOWORD(wParam); // 低位:scroll bar value
nPos = (short int) HIWORD(wParam); // 高位:scroll box position
hwndScrollBar = (HWND) lParam; // handle to scroll bar
怎样组织nScrollCode和nPos的值?