How to Capture Caps And Num Key in c#.net

Question

5.00/5 (1 vote)

See more:

Hey All,

I am trying to capture Num lock and Caps Lock keys of keyboard for User Information in MDI Form

So There is a way to identify keys on/off.

This Caps and Num lock Status are also changed as per the Key Pressed and IF there Short way because Key Up and Down keys are put in the MDI Form and it may increase a load of project.

Regards....
Amit Tank

Posted 16-Dec-10 23:13pm

amit Is Here

Updated 28-Dec-10 23:26pm

v3

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2010-12-16T23:24:00

Try:

C#

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

    // Get they key state and store it as bool
    bool CapsLock = (((ushort) GetKeyState(0x14)) & 0xffff) != 0;
    bool NumLock = (((ushort) GetKeyState(0x90)) & 0xffff) != 0;
    bool ScrollLock = (((ushort) GetKeyState(0x91)) & 0xffff) != 0;

Wild-Programmer · Answer 2 · 2010-12-16T23:21:00

Here you go:

http://msdn.microsoft.com/en-us/library/ms646314[^]

Code here:

C#

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

public class CapsLockControl
{
    [DllImport("user32.dll")]
        static extern void keybd_event(byte bVk, byte bScan, uint dwFlags,UIntPtr dwExtraInfo);
    const int KEYEVENTF_EXTENDEDKEY = 0x1;
    const int KEYEVENTF_KEYUP = 0x2;

    public static void Main()
    {
        if (Control.IsKeyLocked(Keys.CapsLock))
        {
            Console.WriteLine("Caps Lock key is ON.  We'll turn it off");
            keybd_event(0x14, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr) 0);
            keybd_event(0x14, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP,
                (UIntPtr) 0);
        }
        else
        {
            Console.WriteLine("Caps Lock key is OFF");
        }
    }
}

How to Capture Caps And Num Key in c#.net

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0