参考：https://www.cnblogs.com/keycode/archive/2010/10/16/1853166.html
声明：
FDInput: IDirectInput8;
FDInputKeyBoard, FDInputMouse: IDirectInputDevice8;
关键代码：
DirectInput8Create(HInstance, DIRECTINPUT_VERSION, IID_IDirectInput8, FDInput, nil);FDInput.CreateDevice(GUID_SysKeyboard, FDInputKeyBoard, nil);
FDInputKeyBoard.SetDataFormat(c_dfDIKeyboard);
// 屏蔽Windows键的关键方法
FDInputKeyBoard.SetCooperativeLevel(Self.Handle,
DISCL_fOREGROUND OR DISCL_NONEXCLUSIVE or DISCL_NOWINKEY);
FDInputKeyBoard.Acquire;