case WM_KEYDOWN://带sys的按键消息大多是系统需要自己处理的，我们一般不需要，默认处理

        //wParam 指定按键的虚拟键代码

        //lParam 指定技术，扫描码，闲钱状态，转换状态等

        switch (wParam)

        {

        case VK_DOWN:

            SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, );

            break;

        case VK_UP:

            SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, );

            break;

        case VK_HOME://顶部

            SendMessage(hwnd, WM_VSCROLL, SB_TOP, );

            break;

        case VK_END://尾部

            SendMessage(hwnd, WM_VSCROLL, SB_BOTTOM, );

            break;

        case VK_PRIOR://上一页

            SendMessage(hwnd, WM_VSCROLL, SB_PAGEUP, );

            break;

        case VK_NEXT://下一页

            SendMessage(hwnd, WM_VSCROLL, SB_PAGEDOWN, );

            break;

        default:

            break;

        }

        break;