Detecting external keyboard Key Down Events in Ipad2 without EditText Field.

I am trying to detect key pressed for an external keyboard (bluetooth) in IPad2 , I was only able to do so when the focus is on EditText Field.
Without the edit text field , the key down events are not captured by the program . Is there any work around for this issue .

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Key down event in background

Is there a way to make the key down event in the wait event structure run in the background when labview is not the focus? Also what is the difference between the "key down? event" and the "key down event"? I couldn't find a good answer in the LabVIEW help.

tst wrote:
To expand a bit on RF's answer, while you can't use the event structure to register for key down events in other windows, there are some potential options:
You could use the input VIs to poll the keyboard (and you can have a loop which will use a user event to send each new key to an event structure). The main problem with this (and it's a big one) is that it is unreliable. You would have to poll quickly enough (probably at ~20-50 Hz) to have a decent chance of being sure that you're not missing keys and even then it's not guaranteed. The other problem is that you don't know which window was actually in focus.
You could try getting the window messages from the other window. I have no real experience with Windows messaging, but my understanding is that this will probably require you to write a custom hook in C to get it, but it's possible that this is also possible with the standard Win32 API functions. Even if it is, this is probably not something you want to get into to, but you could try looking it up.
Actually this Windows Messaging already exists in LabVIEW:
http://zone.ni.com/devzone/cda/epd/p/id/4394
However there is a few issues. It only partially works in Windows 64-bit, and you have to know the handle to the application that you want to intercept key downs for. I did a quick test and I was able to detect the KEYDOWN event in another VI that was running for for some reason got an error when I tried to get keydown on notepad. This method would eliminate polling if you can get it to work, and because of this you shouldn't miss any key presses.
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Key down event handeling when the VI isn't active

Hi
I've written a simplel VI that increases or decreases a numerical indicator depending on which key is pressed on the keyboard. But this only works when the VI window is active (the titlebar is blue and not gray). Is there anyway to listen for the key-down event even though the VI is not active?
In advance thanks
Georg

I recently ran into a problem with the Acquire Data.
See http://forums.ni.com/ni/board/message?board.id=170&message.id=147363
Just in case....

CS3/MAC key down events

I have a plugin which presents a dialog and does some keyboard input,
and under mac/cs3 ONLY, indesign is capturing and acting upon key
down events before the plugin sees them.
Oddly, key UP events are being passed through normally.
These events are being delivered to the plugin by the
mac toolbox function WaitNextEvent.
Is this a known problem?

The last time I read about the Mac event manager, WaitNextEvent was deprecated in favour of carbon events. Maybe InDesign now also follows this path.
http://developer.apple.com/documentation/Carbon/Conceptual/Carbon_Event_Manager/Concept/ch apter_2_section_4.html
Anyway, bypassing InDesign in order to invoke WNE is bad style. Make yourself familiar with IEventHandler and alike.
> Is this a known problem?
If you're working at Extensis then at least one of your users now has found the problem ... . Could be a different reason though, I just saw this post:
Jeremy Paine, "ID CS3 Control Palette Oddity" #10, 17 Sep 2007 8:33 pm
Dirk

When is Key down event case triggered

Hi all,
In event structure there is an event <this VI> key Down?
When will this event be triggered... i.e will this event be triggered only in case of a keyboard entry... ?
Or in case i use a barcode reader, if data gets populated in a control on the Front panel through the barcode reader will this trigger this event...?
Thanks

The Key Down event will only be fired when a key is pressed on the keyboard. If you want to fire an event off of a Front panel control, you can either use a User Event or a property node called Value (Signaling). This property node will cause a Value Change event to trigger when the value of the Front panel control changes.
Cheers

Key down events

Hi,
I've been working on code for handling a flash-plugin inside an existing application, and have been looking at getting the flash player working with the Cocoa/CoreGraphics API.
Thus far, I have plugin loading, focus, mouse handling events all working. But then key events don't work consistently - on some flash applications, the key down events work, but on most they return a '1' but the flash app doesn't respond.
This is most odd, and a pretty esoteric type of work - I don't know many people who get this kind of work, and it's hard finding people who can share their experiences of this.
I've been going through the NPAPI docs on the mozilla website and copying a lot of the handling code in WebKit, Chromium and Firefox, but none of it seems to help any more - my handling code works the same way as that does, but the responses for key down events are different.
So, this is just a last try before I go crazy - has anyone ever seen anything like this before?
Thanks,
Tom.

Well, it is a problem with Flash Player and not Flash. I don't need an experienced Flash developer.
Seriously though, the nature of the question is so esoteric that I doubt there are many developers anywhere who could give much advice.
Thanks anyway.

How to separate "Key down" event from panel and numerical control

Hi, All
I have a vi proecess key down events for panel and a numerical control in this panel. the application will do:
1. when panel is focused, user can use "up" and "down" key to driver some hardware.
2. when the numerical control has the focus, "up" and "down" key will change it's value as usual.
somehow the second one did not work, because the panel "key down" event was trigger as well when I use "up' "down" key inise the numerical control.
then I used "Key down?" of numerical control to block the "up/down" key. But the first time when I run the Vi, the panel still got triggered one time.
any suggestions on this? test code attached in this post too.
thanks
CQ
Solved!
Go to Solution.
Attachments:
KeyDown_Up_valuechange.vi ‏16 KB

This works for me in 2014. In short, you just need to check to see if your numeric has the focus. If it doesn't, then you process the key value. No need for any other event here except for the stop button.
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Attachments:
KeyDown_Up_valuechange_BD.png ‏32 KB

InsertionPalette activex control key down event

Hi,
Can any one know how to get the key down event of InsertionPalette activex control.
I have handled the KeyDownEvent but it is not fired while the control is active and key is pressed.
regards,
Ceaser

Ceaser,
what is the application developement environment you are working with?
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

How can I detect the PC show down event?

I want to save a file to a certain destination once the PC shut down event happened.
And the save process must be proceeded prior to the PC shutdown.
How can I detect the PC shut down event?

Hi there
Try the "Application Instance Close?" Event.
Best regards
chris
CL(A)Dly bending G-Force with LabVIEW
famous last words: "oh my god, it is full of stars!"

Key down event to start something an stop arbirtrary

hallo,
what I'm trying to do is to start an event on key down an do a loop , something like move an axis for CNC , and this until i press an arbitrary key again.
i have already a while loop an an event structure so it would be good just to add something withtout large modifications.
have anyone an example code for me , please.
i've looked already in a lots of posts but i can't find anything usefull for me.
many thanks in advance

again - lots of ways to do this.
The attached example is just the fastest I could modify the previous version
2006 Ultimate LabVIEW G-eek.
Attachments:
keydownvi3.vi ‏53 KB

S6000 external keyboard keys repeating

I have the S6000 with the external keyboard and the keys tend to repeat most of the time, even with a single tap. Is there a setting that I am missing? The virtual keyboard works fine.

I have found that my BT keyboard starts to repeat when it is low on charge. Charging it solves the problem.

Weird Digital Display Key Down events

(Using LV 8.51)
I have a slider with the digital display shown. The slider is restricted to 0-50 (I32) I want the user to be able to type 0-50 in the digital display only. I have formated the display as %2d and set all limits. The display allows the user to type any arbitrary number of characters as well an many letters. I figured out the random letters are the allowable numeric prefixas such as k (for kilo). I need to not allow the user to type anything in the numeric display except [0-9][0-9]. I figured that I could filter the key down? event. This did not work. I placed the key down? event and the key down immediatly restricted the typing to a single character. What did I do wrong or is this a bug. Is thare a simpler way of restrictin g the imput (NOT Coersing which is done on the data but limit the input characters). Thanks I am stuck on this one.
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA

I hope I am doing something wrong but I dont see it. It seems that independent of registering for the keydown event the action of the slider changes. I have attached an example.
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA
Attachments:
Silder with event filter.vi ‏19 KB

[SOLVED] G602 Gaming mouse extra buttons detected as keyboard keys

I have a Logitech G602 mouse with a bunch of extra buttons. I am familiar with xmodmap, xinput, xbindkeys, and easystroke.
If I use xev to test for input events, my back/forward buttons work like most mice- I get values of button 8 and button 9. However, when I use the other extra mouse buttons, I get IDENTICAL values to pressing 1, 2, or 3 on the keyboard respectively.
As an example, say I open a terminal. I can press these extra mouse buttons and it will "type" 1, 2 or 3 into the terminal just as if I had hit those numbers on my keyboard. If I hit shift, it will "type" !, @, and # just as if I had typed on the keyboard.
If I change the keycodes, I lose function of my 1, 2, and 3 keys. If I use xbindkeys to bind a command to the extra mouse buttons, pressing 1, 2, and 3 on the keyboard will run those commands!
The only thing I can think of is using a different keyboard layout, or that the mouse isnt supported at the kernel level (pressing extra mouse keys with X killed again "types" 1, 2, or 3) and I need to file a bug report somewhere. Where upstream do I file a bug report if this isnt fixable?
Any ideas at all?
Last edited by GSF1200S (2014-03-12 17:12:47)

Perfect Gentleman wrote:I got Razer Naga 2014 Left-Hand. It has 12 buttons that are the same with 1-10 buttons of keyboard. You can only re-arrange 1-3 buttons or not, and that's all you can do.
As I understood remapping of these buttons works fine only in Windows with its windows drivers and software.
For those with or looking to buy a Logitech G602, the answer is unfortunately Windows for a fix I had figured beforehand that it was some kind of assignment issue as I didnt see it possible for 2 different devices to be assigned the same keysym, but thats apparently due to my lack of understanding how such codes are assigned.
After reading the above response, I installed the Logitech software on a buddys windows computer and changed the (top 3) buttons to Shift, Alt, and Super- this allows me to use shift/alt/super + left/middle/right click for use within my wm (Openbox). This is a permanent change until you change it again, so at least you only need windows once.
I had searched around to see if anyone had this mouse working with Linux, but couldnt find any mentions. I can now at least confirm for others all the buttons will work and will be detected if you reprogram the mouse from windows. You can even reassign the battery check G6 button (which I did) and the DPI settings buttons near the left click (I left those alone for gimp work).
I tried Wine for the software without much hope, and indeed while the software installed fine, the program couldnt detect the mouse with it plugged in. It has been my experience that device detection in wine is a crapshoot at best. Anyways, problem solved..

Dialog not on display list getting key down events

Hi all,
I have a listener on the stage listening for KEY_DOWN events.
I show a dialog (MovieClip containing a TextField). Click a button
on the dialog to close the dialog. ("close the dialog" == remove
the MovieClip from the display list - the dialog instance is still
around, which I think is part of the issue)
Now, the stage's listener no longer gets KEY_DOWN events
until I click somewhere on the stage. The dialog's text field is
getting the key events. (I don't normally add a KEY_DOWN listener
to this dialog, but I did as a test to see if it was indeed getting
the events.)
How can I get the stage to get KEY_DOWN events again without
clicking it first? There seems to be no way to explictly set
keyboard focus that I can find.

Hi. What happens if you simply request focus to the
MainTimeline? That should seem to do the trick. If focus is on a
removed element (but it still has focus, which seems weird), the
the stage won't get any events.
( 'i' before 'e', except after 'w')

Safely switching focus during backspace key down event?

I have a simple form that I'm building. It has a variable
length list
of entries, and I'm using a TextInput for each entry.
Because the list is variable in length, I'm allowing the user
to
delete elements from the list. One of the ways they can do
this is to
press the backspace key when the cursor is in an empty
TextInput. I
am handing KeyboardEvent.KEY_DOWN and checking for the
backspace key,
to accomplish this.
The problem I am having is that after I remove the deleted
TextInput,
I want to leave the focus in the TextInput above. I can do
this using
'setFocus', and that works fine, however it seems that the
backspace
is still processing, and so after the focus is set, the
content of the
TextInput is delete which I don't want.
To get around this, I've created a one-shot timer with a 0ms
delay
which changes the focus after the KeyDown event has
completed.
My workaround is successful, but feels very heavy handed. Is
there a
better way to achieve the same effect?
Any advice would be greatly appreciated.
-Robin

I guess one of the way could be adding KEY_DOWN listener on
focus and removing it from other input fields at the same time.
adding/removing listeners is pretty fast.

Detecting external keyboard Key Down Events in Ipad2 without EditText Field.

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