enabling scroll, caps and num key programmatically

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5.00/5 (1 vote)

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as my friend is doing a project, he is facing difficult in enabling the keyboard lights to on and off in a form,
but the simple logic which i get to set the lED on and off in a windows form is pressing the these keys programmatically,
i want to press scroll , caps and num keys programmatically so that LED on the keboard will be turn On and then off, i dont know how to do that, i am a newbie and a student.
thanks in advance,
please help
:)

Posted 7-Dec-12 3:00am

sariqkhan

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[no name] 7-Dec-12 9:17am

+5

sariqkhan 7-Dec-12 9:27am

+5 for what?

fjdiewornncalwe 7-Dec-12 10:02am

It means that Krunal Rohit likes your question. He has upvoted your question. The common way for a CP member to relay this to you is by writing +5. Cheers.

sariqkhan 7-Dec-12 10:09am

:)thank you.
but can you help me in this?
do you have done this before? i am asking about the question which i have asked

2 solutions

Solution 1

Try the following link
[]Read and Update CAPS or NUM Lock Status from your Application[^]

or

Faking num lock, caps lock and scroll lock leds[^]

Posted 7-Dec-12 3:09am

CHill60

Updated 7-Dec-12 3:11am

v2

Comments

sariqkhan 7-Dec-12 9:32am

sir,
first example is of reading the status
i just want to press these keys programmatically.
i dont want user to press these keys, it shows the effect like when windows XP starts up it starts these LEDs for better effect

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CHill60 · Accepted Answer · 2012-12-07T04:31:00

Solution 2

At the top of your class put

using System.Runtime.InteropServices;
...
		[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;
		const int CAPSLOCK = 0x14;
		const int NUMLOCK = 0x90;
		const int SCROLLLOCK = 0x91;

Then to use it ..

keybd_event(CAPSLOCK, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr)0);
keybd_event(CAPSLOCK, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP,(UIntPtr)0);

I think this function has been superceded now so you might want to do a bit of googling and improve on this (I'm using quite an old version of Visual Studio at the moment).

Full list of key codes is at
http://msdn.microsoft.com/en-gb/library/windows/desktop/dd375731(v=vs.85).aspx[^]

Posted 7-Dec-12 4:31am

CHill60

Updated 7-Dec-12 4:32am

v2

Comments

CHill60 7-Dec-12 10:35am

With thanks to Michael Nemtsev at http://bytes.com/topic/c-sharp/answers/464602-possible-turn-off-caps_lock for example code

sariqkhan 7-Dec-12 10:50am

thanks sir
i have found the same code from goodle around 15 mins bfore.
But this is not the production level code,
can you tell me if user press down key then we detect if from keypress event or keydown or other event.. Then using the detection code, and if i want to press the caps key then what will be the code for caps?? Then that code will be implemented in form load event
I think this will be the simple

CHill60 7-Dec-12 12:08pm

Not sure what you mean by "not the production code". You can use the key events to determine if a user has hit a key - but I thought you didn't want them to?

sariqkhan 7-Dec-12 14:09pm

i have done that
thanks to you sir
:)
thank you very much

sariqkhan 7-Dec-12 14:10pm

+5