RAWINPUT.Keyboard：当 NUMLOCK=ON 时如何检测箭头键？

问题描述

当 NUmlock=ON 那么

按下ARROW_UP键：

data.keyboard.MakeCode = 42;
data.keyboard.VKey = 255;
data.keyboard.Flags = 2;
data.keyboard.Message = 256 (WM_KEYDOWN)

按下ARROW_DOWN键：

data.keyboard.MakeCode = 42;
data.keyboard.VKey = 255;
data.keyboard.Flags = 2;
data.keyboard.Message = 256 (WM_KEYDOWN)

按下ARROW_LEFT键：

data.keyboard.MakeCode = 42;
data.keyboard.VKey = 255;
data.keyboard.Flags = 2;
data.keyboard.Message = 256 (WM_KEYDOWN)

按下ARROW_RIGHT键：

data.keyboard.MakeCode = 42;
data.keyboard.VKey = 255;
data.keyboard.Flags = 2;
data.keyboard.Message = 256 (WM_KEYDOWN)

NUmlock=ON 时如何检测方向键？

• 当 NUmlock=OFF 时，一切正常；
• DirectInput（来自 DirectX 8.0）在这两种情况下都运行良好；

解决方法

添加标志：RIDEV_NOLEGACY 并过滤 VKey == 255 的消息