[Gambas-user] Can JSON.Decode be faster?

[Benoît Minisini]

Le 17/01/2018 à 21:27, Patrik Karlsson a écrit :
> In this little project: https://github.com/trixon/gambas-idg (contains a 
> json file, requires Gambas=3.10.90 c1e4b89 (master))
> 
> I'm decoding a json string around 1MB and it takes 30 seconds in Gambas.
> CPU:       Quad core Intel Core i7-6700HQ (-MT-MCP-) cache: 6144 KB
>             clock speeds: max: 3500 MHz 1: 800 MHz 2: 800 MHz 3: 800 MHz 
> 4: 800 MHz 5: 800 MHz 6: 800 MHz
>             7: 800 MHz 8: 800 MHz
> 
> When doing it in java with Google Gson it takes virtually no time at all.
> 
> I intend to use this in an image viewer that consumes base64 encoded 
> photos wrapped in a json among its exif data.
> Could this be done faster in Gambas?

The JSON.Decode() is not really optimized, so I think it can be made faster.

By the way, it's not a good idea to use JSON for big binary data.

> 
> I guess I could split the base64 from the json but it would be nice to 
> have it atomic.
> 
> Sidenote 1:
> Should not Now() for 01/17/2018 21:47:57.73 be 01/17/2018 21:47:57.730 
> with a zero at the end?

This is the standard Gambas format, read the Format$() documentation 
about dates.

> 01/17/2018 21:47:28.687 load json
> 01/17/2018 21:47:28.687 decode json
> 01/17/2018 21:47:57.699 getBase64
> 01/17/2018 21:47:57.699 loadImage
> 01/17/2018 21:47:57.73 done
> 
> Sidenote 2:
> How do I get rid of that margin around the ImageView?
> It's very visible in fullscreen mode but it's there in normal mode too.
> When I shrink the window size so that the scroll bars are about to 
> appear, the margin gets away, but then the image is too small to watch.

It comes from the ZoomFit() method. Maybe this method should takes the 
margin as an optional argument?

> 
> /Patrik
> 
> 
> 
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-- 
Benoît Minisini