Native Json instability

Venorcis · October 2013

When using the Native JSON libraries, I experience much instability, which is worse on Android devices (through a built APK) than on Windows (through the Gideros Player).
The Player gives a Runtime Error once every while when trying to decode JSON, and the Android app crashes almost every time when decoding JSON. I haven't got around to properly debugging the Android crash yet, but it seems like some errors exist in the implementation. I followed the HTML ReadMe provided in the JSON zip for installation.

ar2rsawseen · October 2013

@Venorcis that is interesting, because all platforms use completely the same C code,only built for different platforms.

Can you please provide a small Gideros project example, which has the crash and I will look int that

keszegh · October 2013

i hope you can track the origin of this, i also want to use native json soon, and it would be a problem if it turns out to be buggy.

keszegh · October 2013

@Venorcis, did you find the cause of your problems?
For me, after some testing the native json works fine in the android player and also in the windows player, no crashes so far. I just use the datasaver module and changed every occurence of Json.Decode to json.decode and Json.Encode to json.encode so that it uses the native json instead of the json lua file it used before.

ar2rsawseen · October 2013

I also had not experience any problems, running tests and stress tests.
Thats why I thought thats some special occasion which might have the problem.

But good idea updating dataSaver, will update it in github repo, since NativeJson is now bundled with Gideros

Venorcis · October 2013

@ar2rawseen I'm going to try again using the new Gideros release; the fiddling that was necessary before with the lab file might have been a cause of problems

Venorcis · October 2013

@ar2rawseen The issue persists for us using the native JSON plug-in on Android through an APK with the latest Gideros release. With json.lua, everything works fine, but through require "json", the app always crashes on Android devices (tested on 3 different ones).
What's weird about this is that we load a menu (tabs, max 5 strings) and messages (max 10 objects with about 10 parameters each), but the menu always loads and the app crashes at loading the messages.
Will debug this properly monday (no phone connector cable at the office)

Venorcis · October 2013

@ar2rawseen Please see http://www.giderosmobile.com/forum/discussion/4043/debugging-android-crashes

Venorcis · October 2013

My apologies; I have fixed this issue. Apparently, some mess was printed after the json in some cases. This topic can be deleted!

keszegh · October 2013

that's good to hear.

Armand · March 2014

I also noticed instability of the JSON library when decoding JSON. Indeed, it always seems to be caused by incorrectly formatted JSON. Nevertheless, imho this should not cause a crash, at best an error message.

ar2rsawseen · March 2014

Unfortunately this seems to be a limitation of underlaying lib.
Does it crash even through pcall?

Venorcis · March 2014

@ar2rsawseen Yeah, it does. We would still like to see faulty JSON handled differently as well.

SinisterSoft · March 2014

It would be handy if incorrectly formatted json data returned nil rather than crashing.

amaximov · March 2014

Strange, I think pcall worked fine in the app I'm currently using...

ar2rsawseen · March 2014

Ok so basically it is a 3rd party lib, I didn't even do lua binding, only changed it to load the Gideros way.

And from what I see in the code, there is a json.safe , which has same encode/decode methods.

But from my tests it still did crash on some occasions. But maybe it would help someone

SinisterSoft · March 2014

I was refering to the already built-in json lib (not your new labs version

)...

On the built-in one if you try json in an empty string then instead of returning nil, it crashes.

ar2rsawseen · March 2014

@SinisterSoft as far as I know, they are the same

dreiko65 · March 2014

Hi all. Does anybody know how can I convert a json date from 1224043200000 to a proper date format like lets say 21-3-2014
Thanks in advance

ar2rsawseen · March 2014

To produce a date table, we use the format string "*t". For instance, the following code 
    temp = os.date("*t", 906000490)
 produces the table 
    {year = 1998, month = 9, day = 16, yday = 259, wday = 4,
     hour = 23, min = 48, sec = 10, isdst = false}

Source:
http://www.lua.org/pil/22.1.html

dreiko65 · March 2014

@ar2rsawseen Thats great.Thanks a lot for your help. Much appreciated.

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