I want to know how can i detect which key pressed (for example on Desktop or my computer ).
when detect pressed key show it with MessageBox
how can i do this?
Detecting the key presses outside of your application requires installing a Low Level Keyboard Hook. Here is a CodeProject article demonstrating the process.
Related
I have a question about renaming soft keyboard keys in Windows Store Apps (C#).
Is it possible to rename soft keyboard key?
For example, I need to rename key "Enter" to "Send". Is it possible?
It is not possible to rename a soft keyboard key. Here is further information on the touch keyboard, which details how it is a system component (so changing it from an app isn't possible).
During my search, I've seen many different versions of this question, yet somehow none of the solutions provided solved my problem.
It's really quite simple, I just want to simulate holding down a key on the keyboard through code. I want to try and make a character in a game walk forward constantly, so I just need to make a program that simulates holding down the 'W' key. I've seen a lot of people were using Windows Forms for this, I don't know if it actually is the right application but if it works I'm happy.
Just very quickly sending the key doesn't work, so simply calling SendKeys.Send('W') every 30ms does not make my character move in-game. So, what can I do to simulate holding down a key on the keyboard?
Here you go, a .Net library can simulate key press
https://inputsimulator.codeplex.com/
Edit
To get the key works, the external program must in active window, and your program need to run in background.
Windows Forms provides the SendKeys method which can simulate text
entry, but not actual key strokes. Windows Input Simulator can be used
in WPF, Windows Forms and Console Applications to synthesize or
simulate any Keyboard input including Control, Alt, Shift, Tab, Enter,
Space, Backspace, the Windows Key, Caps Lock, Num Lock, Scroll Lock,
Volume Up/Down and Mute, Web, Mail, Search, Favorites, Function Keys,
Back and Forward navigation keys, Programmable keys and any other key
defined in the Virtual Key table.
It provides a simple API to simulate
text entry, key down, key up, key press and complex modified key
strokes and chords.
I have a Fn key on my USB keyboard which allows me to enable certain features on my keyboard. So, if I press Fn + F10, the keyboard will switch to a different mode.
I have a feeling it's possible that Windows has no access to the Fn on my keyboard. However, I thought maybe there may be some undocumented way of triggering this key for keyboard that have a Fn key (like laptops, etc).
Basically, no you can't emulate it.
Keyboards work by sending standard scan codes to the PC. On a regular keyboard each key is mapped to a scan code. There is no scan code for the fn button, instead it tells the keyboard to change the scan code it sends in response to a given key press. E.g. on my laptop the home button normally sends the scan code for home, but if I press the Fn key as well it sends the scan code for print screen. It is deliberately transparent to the operating system.
I was hoping someone could help me with simulating a function key combination in C#, in this case FN + F4.
Here's what I'm trying to do... I have an older touchscreen netbook that I recently installed Windows 8 on. It has a swivel screen so you can fold it down and use it like a tablet. Windows 8 runs surprisingly well on it. I had a few minor issues, most of which I was able to work out, but one remains.
When you first power up the netbook or wake it from sleep, the screen is at 30% brightness, and Windows thinks that this is the max setting, so increasing the screen brightness through the normal methods does not work. On my netbook, pressing FN + F4, restores the screen to full brightness. This is a minor annoyance though, because I have to swivel the screen back and forth to fix the brightness using the physical keyboard, when I'd like to just leave it in the tablet position and minimize wear and tear.
What I'd like to do is write a little application that runs on start up, and simulates the function key combination, so the brightness is restored automatically. Any suggestions would be greatly appreciated. Thanks.
The Fn key is not a key that is sent from the keyboard to the computer. It is actually used to change the meaning of keys on the keyboard (such that the keyboard sends different scancodes when the key is pressed with Fn held down).
You should be able to easily write a simple Windows Forms program that listens to key presses and shows you what has been received. Register for the KeyDown event. The KeyEventArgs your handler receives has various properties that you can inspect to see what is being received.
The FN key isn't a real keyboard key like the other modifiers (shift, alt, ctrl) nor is it a function key like the F1 - F12. The FN key is a hardware only key that simply tells the hardware to send a different keystroke while the FN key is being pressed.
So, you are going to have to adjust the brightness manually like "m-y" stated in the comments or through some other mechanism.
Reference Link.
I want to essentially absorb key presses.
I'm currently using key preview on my main form and have an event handler for a key press that checks if the windows key is pressed. Is there a way to prevent the key press for leaving the application and opening the start menu?
There is an option for specific controls to suppress a key press, is there a way to suppress a key press to Windows?
The only way to intercept keyboard events outside your application is with P/Invoke SetWindowsHookEx. This will set a global callback to keyboard events agnostic of the focused application.
Several places to start looking:
How to disable windows startmenu using vb.net?
Disable Windows Key [Resolved] - has a reference to SetWindowsHookEx
Disable CONTROL + ALT + DELETE and Windows(win) Key in Windows 7 using Win32 application