I have a barcode scanner works as HID device. Everytime a barcode scans it goes directly to windows keyboard, for example if I open notepad I can see the barcode typed there.
As far as I know programmatically is it possible to to read HID data from your HID devices.
But what happens if the user is already on a form with a text edit control? The scanned code will go inside the text box.
Can you block incoming text and make a background-only processing?
Can you explain the theory please?
See if your barcode scanner can emulate a serial port and just read the data directly from the the serial port into your app.
That is cleaner and less expensive then a global keyboard hook. When I was looking into this awhile ago I found that most USB barcode scanners can emulate a serial port, it's a cinch to read serial port data in most programming languages. I happened to be doing mine in Java, I posted an example in answer to this question actually.
You can set up your scanner to use USB-HID(POS) setting. Your datasheet of barcode settings for the scanner device should have it. I use this project to test my scanners. http://www.codeproject.com/Articles/18099/A-USB-HID-Component-for-C
Sure, just capture keypresses before they are handled by the control and suppress normal handling of the events. In VB.NET you might override the OnKeyPress method in your form and set KeyPreview to true, for example.
Related
I have been trying to build a TV application, using an SD.
I have got features like image gallery, video player running,
However, I also wanted to add a virtual on-screen keyboard that works with up-down left-right arrow keys. Can somebody help me with how to get started?
When I wanted to do this with my Vestel (Polaroid Branded) smart TV, which uses "Opera for TV devices" as it's HbbTV browser, I found that I didn't need to.
I simply just used HTML text fields and input types where needed, and as soon as I clicked into them, the browser/OS kernel popped up an onscreen keyboard that was built in for me.
However, I did do some research to see if I needed it, and on some devices you do, whilst I never actually implemented it (My app was just for my own use) the "BBC Television Application Layer" (TAL for short) : https://github.com/bbc/tal had pretty good keyboard support.
Another one that might be worth looking at is "Mautilus SDK" : https://github.com/mautilus/sdk
Be aware though, both are horribly convoluted and use quite complex code where it's really not needed.
This past week at my work we aquired a laser barcode scanner, and are looking to use it with ubuntu server. The scanner acts as a HID, so we need to hook the keystrokes it generates. We are hoping to use GO to do so.
Any help would be greatly appreciated.
The answer was just to read the raw event and parse it.
I have a bluetooth headset that I would like to be able to quickly switch between connection from my laptop(running windows 8) to my phone. I downloaded autohotkey to help me make a hotkey that would connect to my bluetooth headset, but I was only able to make a hotkey that would open the bluetooth control panel for my specific headset, which is not what I was trying to accomplish. What I am trying to accomplish is a hotkey that would immediately connect my headset when typed.
The code I used in autohotkey, to open the bluetooth control panel(by clicking Ctrl+Alt+B) is:
^!b:: run "C:\Program Files\WIDCOMM\Bluetooth Software\BTWUIExt.exe" /deviceAddr=445ef3aa5294
this code won't work for you as the numbers and letters on the end are a uniqe idendifier for my specific headset. You can find your unique id by opening bluetooth in the control panel and right clicking your headset, selecting properties, clicking the bluetooth tab (remove the dots and colons).
This worked to connect the first bluetooth device in the list (Windows 10)
#SingleInstance,force
;https://autohotkey.com/board/topic/83571-autohotkey-connect-to-bluetooth/
^F1::
Run, bthprops.cpl
Sleep, 2000
Send, {tab}{tab}{enter}{tab}{enter}
Sleep, 200
Send,!{Tab}
return
There is very little information to give exact solution. But from given information I can say:
You can automate GUI with AutoHotkey so that script will go to the
place where unique id is located. In fact, AutoHotkey allows any
GUI automation (conventional or non conventional GUI).
If the unique id is there as a text and you can copy it, then it
also can be automated by several ways. If unique id cant be coped
and is as image, then it is slightly complicated and you need to use some OCR
techniques. In that case you need to make screenshot of that region
and use some OCR script getting text out of it. Or with AutoHotkey pass image to OCR software and get text from it.
After you have text, you can manipulate it the way you like. Most powerfull solution
is Regular Expressions which are supported by AutoHotkey.
When unique id is ready to use, you can use it in Run
command this way:
^!b:: run "C:\Program Files\WIDCOMM\Bluetooth Software\BTWUIExt.exe" %MyUnicIDVariable%
Turns out that the code I have works on its own. If I just wait for about 10 seconds after typing out the hotkey, the headphones connect, and the control panel that opened automatically closes. Quite convenient actually as I didn't expect it to connect or to auto-close the window.
Thanks for the effort anyway!
Try to install [Broadcom Bluetooth 4.0 Driver for Windows 8.1 ] LINK=>> 1 !
At least works fine on my HP-EliteBook-8570p with stereo "BlueDio 99B" headset. After switching the headset ON the Windows connect the device automatically, and switch Audio-Stream into new-attached device. Optimal!
PS - Unfortunately it is still the Problem with Windows 8.1 + Skype( MIC-Problem) :( Windows 8 is the first OS, than not support Skype at all! ;)
I am working on a Qt application running on embedded Linux. I am pretty new to this Qt business since I have just started it a month back, so understand that I'm not that object-oriented ... :P
I have the Qt applications running on my target running Linux. The Qt documentation http://doc.qt.io/archives/qt-4.7/qt-embedded-pointer.html says that we have to enable touchscreen, USB keyboard, keypad, etc. by exporting certain variables. Namely,
export QWS_MOUSE_PROTO=tslib:/dev/input/event1
export QWS_KEYBOARD="linuxinput:/dev/input/event0 usb:/dev/input/event2"
well, as you can guess, first line sets the mouse device in QT as touchscreen. "tslib" is the touchscreen library, and the "event1" is the node representing the touchscreen. Similarly, second line is for on-board keypad (event0), and USB keyboard (event2).
Now, the touchscreen work very well. But the problem is with either keyboard. If I do not export the second variable, namely QWS_KEYBOARD , then the application runs fine. But if I do export the second variable, the application goes into stopped state (SIGSTOP) as soon as it is launched. This is evident from ps output. I can not make it work with SIGCONT.
I am going to try and reconfigure Qt from source. Any thoughts are welcome.
Can not believe this but setting the QWS_KEYBOARD variable as null solved the problem.
Found it in the Qt developer FAQ http://developer.qt.nokia.com/faq/answer/why_doesnt_my_keyboard_work_after_i_have_done_an_export_qws_keyboard_dev_tt
export QWS_KEYBOARD=""
Well, it did not completely solve the problem since I still have to include the native keypad along with the USB keyboard.
Anyway, I am able to move to fields using the arrow/TAB keys. Text input works well. Although CAPS-LOCK and NUM-LOCK do not seem to work. SHIFT works. I am able to terminate the application by Ctrl+Alt+Bkspce. So, for the time being, I am able to input text at least.
Will post if any improvements.
I have recently got a portable printer MZ 220. However i am not able to pair with it, i have looked everywhere in the manual to try get the pin and i have tried 1234 and 0000..??
you have to set up an autorisation code on the printer.
standard the printer dont have a pin code.
you can't pair with android becouse android requires a pin.
use Lable vista to set up the printer.
also look in the document's of zebra they have described it somwere.