quiting applications [solved]

flashjaysan · July 2018

First, I know that it's a bad practice to call an exit function to quit an app on mobile but I'm more interested in desktop and web games.
I saw in the documentation that the Application:exit() call is only available on Android. Is it still the case or is it an old description of that method?
I want to be able to quit my game with some kind of input (for example from a menu option or by pressing Escape key or a gamepad back button). How would I do that?

local function onKeyDown(self, event)
  local ESCAPE_KEY = 27
  if event.realCode == ESCAPE_KEY then
    Application:exit()
  end
end

Would it do the job?

SinisterSoft · July 2018

Off on a tangent...

Gideros has macros (they can act as constants) so they don't take up valuable variable space, also they may work a few cycles faster.

ESCAPE_KEY@27
 
local function onKeyDown(self, event)
  if event.realCode == ESCAPE_KEY then
    application:exit()
  end
end

See also this for other things you make not know about re the Gideros flavour of Lua... http://docs.giderosmobile.com/reference/enhancement

keszegh · July 2018

i think it would do the job perfectly,
don't forget to save states to file if necessary, before quitting.

flashjaysan · July 2018

@SinisterSoft What do you mean by going off on a tangent?
Those macros are awesome! Didn't knew that!
@keszegh Yeah! I'll have to be watchful of that!

keszegh · July 2018

tangent=off-topic

flashjaysan · July 2018

@keszegh Oh! OK.
However, @SinisterSoft 's advice was a good one for me.

flashjaysan · July 2018

Allright. So to recap, Application:exit() does force quit the application even in Gideros
Player.
However, the escape key code from previous answers doesn't work at all. When I trace it in the console, the Escape key has a weird realCode. I thought it was 27 according to many charts on the web (just an assumption since there is no documentation for that key and many others). When I traced realCode values in the console, the Escape key gave me the value 16777216. Number keys (up the letter keys not the numpad ones) gave me weird numbers too.
I have a french keyboard by the way.
I don't get it at all.

oleg · July 2018

maybe you have a non-standard keyboard or you have a broken key
maybe the button is stuck shift + m +h

flashjaysan · July 2018

My computer is pretty new, and it is a laptop one. I doubt it is something coming from my keyboard.
Would you be kind to try it on yours and tell me what are the values you get?

ESC_KEY_CODE @ 27
function onKeyDown(self, event)
  print("keycode pressed : "..event.realCode)
  --[[
  if event.realCode == ESC_KEY_CODE then
    Application:exit()
  end
  ]]
end
stage:addEventListener(Event.KEY_DOWN, onKeyDown, stage)

flashjaysan · July 2018

I tested my keyboard online with 2 different keyboard checkers and all is working except for numbers where I have to SHIFT them for it to work and some special signs aren't available (french keyboard). Escape key is working good.

oleg · July 2018

I get values = 27

try this way

-- print("keycode pressed : "..event.realCode)
 print("keycode pressed : "..event.keyCode)
 
 
 
--stage:addEventListener(Event.KEY_DOWN, onKeyDown, stage)
 
stage:addEventListener(Event.KEY_UP , onKeyDown, stage)

keszegh · July 2018

for ESCAPE key you can use KeyCode.ESC normal keyCode i think.

flashjaysan · July 2018

@oleg This is really weird! I don't get it.
@keszegh Where did you found this constant? The documentation doesn't lists it. However, with this, it seems to work.
What is the difference between keycode and realCode properties? It seems I can compare the keyCode with the right constant but not the realCode.

flashjaysan · July 2018

Escape gives a realCode of 16777216 but a keyCode of 27 (the good value).
F1 to F12 gives realCodes of 16777264...16777275 but keyCodes of 0.
I think I'm wrong somewhere.

oleg · July 2018

keyCode: (number) code of the key pressed.
realCode: (number) real keyCode underneath

flashjaysan · July 2018

Yeah. That's what the documentation says. What is the real keyCode underneath? Could you explain a little more?

flashjaysan · July 2018

Now I got an error message : calling 'exit' on bad self (Application expected, got table)
Here is my code :

function onKeyDown(self, event)
  if event.keyCode == KeyCode.ESC then
    Application:exit()
  end
end
stage:addEventListener(Event.KEY_DOWN, onKeyDown, stage)

Is there something wrong in that?
Edit : When I export to Windows, it says something different : index '__userdata' cannot be found.

keszegh · July 2018

whenever there is no assigned keyCode, there is still a realCode, so this way you can handle keys which do not have a specified constant.
where KeyCode.ESC comes from i don't know, there are some undocumented things which only exist in hidden forum topics, but probably it is anyway only a constant equal to 27.

flashjaysan · July 2018

@keszegh So you're telling me that even if there is no KeyCode constant for a key, I could compare the keyCode property to a number corresponding to a KeyCode instead of using non portable realCode.

oleg · July 2018

~~Application:exit()~~
application:exit()

flashjaysan · July 2018

@oleg so there is an instance of the Application class called application just like the stage instance of the class Stage. I should have known! Thank you! It works now.

SinisterSoft · July 2018

@flashjaycan - yes, I forgot to mention that you had that wrong - I already fixed it in my macro example (scroll up!)...

keszegh · July 2018

@flashjaysan , check with a test app, if there is a non-zero keyCode, better use that, otherwise use realCode. they are both pretty portable, i've been using many of them across windows/mac versions. as far as i remember i had only problem with the '~' key on french macs not working the same as on my english windows keyboard, but french keyboards are anyway crazy.

flashjaysan · July 2018

@SinisterSoft Thanks! All is good then.

@keszegh Indeed! French keyboards are a nightmare to code!

oleg · July 2018

In French Keyboard, the button codes should not be different from English

flashjaysan · July 2018

@oleg I meant that french keyboard layout is bad for programming. Accessing square brackets for example is convoluted.

MoKaLux · March 2019

hello there, I have a question somehow related to this one.

Is it possible in gideros to handle the button close of a window app?

For example if the user is on the menu screen and clicks the close button (x) then the app closes. But if the user is on the level 1 screen and presses the close button then the app goes to menu screen?

The KeyCode.ESC works but I would like to push it a little bit further. Thank you.

SinisterSoft · March 2019

Yes, getting that event and stopping it from actually exiting if needed would be handy.

MoKaLux · March 2019

hello sinistersoft, I was trying to pm you. Could I have access to modify the wiki please? I am retrying gideros for the nth time and this time and want to make it the right one!

To introduce myself a little bit, I am coming mostly from java (I did a little bit of everything as a hobby). Now I am learning gideros (and lua). I am making some progress and when I read the doc (which can be very old) I stumble upon some articles/tutos that can be enhanced. My contribution will be small at the beginning but should increase!?

MoKaLux · March 2019

no worries about the close button, I will do it the conventional way (that is putting a back button I guess).

SinisterSoft · March 2019

I've PM'ed you @MoKaLux

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