Detect Caps Lock C #

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Detect Caps Lock C #

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#1 by (5 votes)

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I made an application to detect the state of the caps lock in C #, but found a problem, when the application loses focus, the events can no longer be triggered causing the notifications to no longer be displayed by the application. I took a brief look at the internet and saw that using windows DLLs it is possible to do this. Anyone have any suggestions?

c# .net

asked by anonymous 03.05.2014 / 13:37

1 answer

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score 5 · Accepted Answer

Using Console.CapsLock

 Console.WriteLine( "Caps Lock " + ( Console.CapsLock ? "Ligado" : "Desligado" ) );

To check the status after returning to the application, it would be the case to do a polling.

Using DLL:

Add to your code:

using System.Runtime.InteropServices;

Here is the actual detection:

[DllImport("user32.dll", CharSet = CharSet.Auto,
   ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]

public static extern short GetKeyState(int keyCode); 

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

Console.WriteLine( "Caps Lock " + ( CapsLock ? "Ligado" : "Desligado" ) );