Shop price system assistance and guidance help needed please.

[AJB2K3]

This is a follow on from my post about JSon querys and got me thinking but I need some assistance on where to look for the solution.

I have M5Stack Coreink that doesn't have the memory to directly access a full shops JSON file so I started thinking.

If I set up a Raspberry pi (just because I have one) to act as the master shop server. that does the searching and then creates small files that the coreinks can access that files.

[stijn]

That would work, but begs the question: why not do everything on the RPi then
Manually parsing the JSON might actually still be simpler and quicker to implement, i.e. read from socket in chunks and then look for things you know (from a quick look, in this particular case it looks like all products start with id/title/handle).

[AJB2K3]

That would work, but begs the question: why not do everything on the RPi then

Because the RPI team havent made a stand alone e-ink device.

Manually parsing the JSON might actually still be simpler and quicker to implement, i.e. read from socket in chunks and then look for things you know (from a quick look, in this particular case it looks like all products start with id/title/handle).

Instead of downloading the whole json, I tried to download just a part of it but i kept getting syntax and unscriptable errors

[stijn]

Because the RPI team havent made a stand alone e-ink device.

Fair enough.

I tried to download just a part of it but i kept getting syntax and unscriptable errors

Yes because a part of the string isn't valid JSON. I.e. if the complete JSON string is

Code: Select all

{"products": [{"id": "id1"}, {"id": "id2"}]}

and you only have a part of it

Code: Select all

{"products": [{"id": "id1"

that is not valid JSON. so cannot be parsed.

With 'manually parsing' I mean that you get a part of the string and then manually look for product ids etc with string operations or regex. E.g. on the string above if you do

Code: Select all

ure.match('.*\{"id": "(\w+)"', '{"products": [{"id": "id1"').group(1)

that will return "id1". Of course this is just a simple example and you'd need to take care of dealing with looking across 2 chunks but it's doable and does not require much memory.

[AJB2K3]

Ahh, that explains a few things then.

This is the Prototype code for one of the GUI's

Code: Select all

from m5stack import *
from m5ui import *
from uiflow import *

setScreenColor(15)


my_50mm = None
my_100mm = None
my_200mm = None
my_500mm = None


label0 = M5TextBox(20, 27, "Text", lcd.FONT_DejaVu24, 0, rotate=0)
label1 = M5TextBox(10, 86, "Text", lcd.FONT_DejaVu24, 0, rotate=0)
image0 = M5Img(17, 152, "res/default.png", True)
label2 = M5TextBox(10, 434, "Text", lcd.FONT_DejaVu24, 0, rotate=0)
label3 = M5TextBox(10, 495, "Text", lcd.FONT_DejaVu24, 0, rotate=0)
label4 = M5TextBox(10, 553, "Text", lcd.FONT_DejaVu24, 0, rotate=0)
label5 = M5TextBox(10, 619, "Text", lcd.FONT_DejaVu24, 0, rotate=0)




label0.setFont(lcd.FONT_DejaVu40)
label1.setFont(lcd.FONT_DejaVu40)
label2.setFont(lcd.FONT_DejaVu40)
label3.setFont(lcd.FONT_DejaVu40)
label4.setFont(lcd.FONT_DejaVu40)
label5.setFont(lcd.FONT_DejaVu40)
label0.setText('15mmX15mm')
label1.setText('Aluminium Extrusion')
image0.show()
label2.setText(str((str('50mm (12pcs):') + str(my_50mm))))
label3.setText(str((str('100mm (12pcs):') + str(my_100mm))))
label4.setText(str((str('100mm (12pcs):') + str(my_200mm))))
label5.setText(str((str('100mm (12pcs):') + str(my_500mm))))
lcd.show()

Not nearly even halfway finished yet but working on it.