im looking into the WDK at the moment to see how i would be able to make a systemwide keyboard hook on USB keyboards ( and a specific ID ).
What i want to be able to is to filter the keystrokes coming in from that specific USB keyboard (USB HID/keyboard), and be able to send that to a specific application/process only.
Ive seen examples of applications that has to be running that can do that in combination of rawinput and a hook, but i would like it to be systemwide and not demanding an application to run.
I can find examples that makes it quite easy to do with a PS2 keyboard, but when it comes to the USB it starts to look very different.
anyone could suggest me the correct model it has to be based on, and even better examples of how it would be possible to do that ?
and something that would work from XP/windows7 to Windows10 also.
Related
I have coded up a low level keyboard hook using SetWindowsHookEX() on Windows CE 4.2 and it seems to work just fine. I am able to see key events using the keyboard and a barcode scanner in notepad and other applications as desired, but I do not see the barcode scanner events in the one application that I want to collect the keys in. I still see events from the keyboard, however, so I know that the keyboard hook is still working and in the hook chain. I have even tried inserting my hook in the chain every millisecond just to see if it would make a difference, but no dice. If I flip back to notepad, it's back to working the way I want it.
I'm not sure what the other application is doing to gain control of the scanner when that application is active that prevents it from acting like a keyboard any more. Any thoughts on this would be greatly appreciated. I've done a bunch of searches without any success. I looked into trying to use RAWINPUT, but it doesn't seem to be supported in Windows CE 4.2 from what I can tell as I don't see the user32.dll in the SDK.
There are two ways to get barcode data on most WEC devices.
The keyboard wedge (where data comes in as as keyboard events)
An OEM specific barcode reader API
If this other app your looking at uses option #2 then there is no keyboard data to retrieve, so it makes sense you wouldn't see any. That said, you might read this article to see if it offers any tips for your keyboard hook.
Functions exported by user32.dll in big Windows are generally found in coredll.dll in WEC/WEH.
-PaulH
I bought a physical button and hooked it up to my computer, using the Arduino it communicates over USB serial to a C++ program I'm writing. Now I want to make the button simulate a keypress on my computer so I could use it as an alternative controller for the games I play.
If you are not familiar with Arduino, don't mind it, my problem lies completely in C++
The solution for this is pretty simple, it basically boils down to using SendMessage to a window with keystrokes, or many alternative methods like sendKeys and what not.
I have tried every single library or windows function that could handle something like this, but none of them actually simulates a keystroke being pressed by a keyboard.
Everything I tried so far has worked in many programs like Notepad and Chrome but none works with a game that doesn't listen to windows messages to handle key input.
My guess is that these games use GetAsyncKeyState which is communicating with the physical keyboard in a direct manner.
How could I resolve this? What API provides such functionality?
I need something very low level here, maybe even a program that emulates a new keyboard so windows thinks I have plugged in a physical one.
This would help me ALOT I've encountered this problem numerous times and I will keep encountering it in the near future with other projects.
I hope someone can help,
Thanks!
Use keybd_event() or SendInput()
I need example of code (or some tutorial) for making virtual HID (Human Interface Device).
If possible with bluetooth integration and made for linux using QT/C++.
Practically, I want to make my own cellphone application which will have few buttons (but it will work as keyboard - sending keystrokes), without requiring server-side application (it will control windows/linux/mac operating systems), and HID seems to me best choice. Unfortunately, I can't find any code samples or tutorials for that.
The thing is I don't know how I am supposed to make service and register it (make it available over bluetooth so OS can recognize it as keyboard and pair with it).
So far I have found about BlueZ, but as I mentioned, I cant find any code samples or tutorials.
UPDATE: I am trying to make my cellphone (Nokia N9 - Maemo 6/MeeGo OS - Linux) to pretend as HID device via BlueTooth so I can send keystrokes to PC.
The first question that comes into my mind is this usb device made by you ?
I don't understand what making my own cellphone application means . So you have a device that is a cell phone or what please be more explicit
Anyway a solution for you might be the libusb library works very well on both windows and linux machines.
If you need to study about usb hid devices and how to interact with them you can find a lot of very good tutorials here.
Please be more explicit in order to help you.
How can I completely disable the keyboard using c++ in windows? And by completely disable I mean so even Ctrl+Alt+Delete doesn't work. I did consider using a keyboard driver but I think you need to restart the computer after it is installed, but since I only need to disable it for a couple minutes that wouldn't really work.
This is not really possible.
WinLogon is designed as the one process that intercepts the Ctrl+Alt+Del key press, even when all other things hang or die.
This is the failsafe against malicious sessions, etc. So there is no obvious workaround.
Maybe a keyboard filter driver would make your request possible, but that is a real kernel-driver.
You can't disable Ctrl-Alt-Delete without removing the keyboard or replacing the keyboard driver, it generates a kernel level notification.
You could use BlockInput function. But it doesn't block CTRL + ALT + DEL.
You could install a keyboard hook and filter out the messages, but you might need to have your application as the top most window. Even then Ctrl+Alt+Del would not get filtered out.
Here's SetWindowsHookEx on MSDN
Example of Hooking the Keyboard
Ok, here goes several random suggestions. I don't have a definitite answer, but here's where I would start:
1) SetupDiRemoveDevice is probably the API you want to call. Although to call it, you'll need to make a lot of other device enumeration calls. Enumerate your HID and USB devices and find the keyboard. Start by looking for the VID/PID of the actual device for starters.
2) Delete the drivers kdbclass.sys and kbdhid.sys. You'll be fighting Windows system file to do this. I have no idea if this will work, but sounds interesting and simple.
3) Write a USB filter driver. Your driver will need to know (or be passed) the vid/pid of the device to filter on, but it might work.
I am looking for the standard source code for a keyboard. Is there any where that I can download this source code so that I can modify it for my own use?
No such thing as "standard source code" for a keyboard. Here's a page on the Linux keyboard driver: http://www.linuxjournal.com/article/1080
Your best chance for a Windows keyboard driver will probably be to get the Windows DDK (Device Driver development Kit). OTOH, based on the questions' tags (especially vb.net) I'm left wondering exactly why you'd want that. The keyboard driver itself mostly just gets activated when the user presses a key, gets the data, and goes back to sleep. If you're interested in something like mapping keys to different characters, that's not in the keyboard driver itself at all (without even looking at any code for the driver itself).