關閉顯示器

SendMessage((HWND)65535, 274, 61808, 2);

SendMessage(hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, 2);

WM_SYSCOMMAND 意爲“窗口消息_系統指令”
SC_MONITORPOWER 意爲“系統指令_顯示器電源”

-1 (the display is powering on) 打開顯示器
1 (the display is going to low power) 低電狀態
2 (the display is being shut off)  關閉顯示器