c# - How can I find the state of NumLock, CapsLock and ScrollLock in .NET?

Question

How can I find the state of NumLock, CapsLock and ScrollLock keys in .NET?

question from:https://stackoverflow.com/questions/577411/how-can-i-find-the-state-of-numlock-capslock-and-scrolllock-in-net

Answer 1

Import the WinAPI function GetKeyState

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
public static extern short GetKeyState(int keyCode);

and then you can use it like that

bool CapsLock = (((ushort)GetKeyState(0x14)) & 0xffff) != 0;
bool NumLock = (((ushort)GetKeyState(0x90)) & 0xffff) != 0;
bool ScrollLock = (((ushort)GetKeyState(0x91)) & 0xffff) != 0;

EDIT: the above is for framework 1.1, for framework 2.0 + you can use

Control.IsKeyLocked