Real Time data and Json File

[JKSH]

@suslucoder said in Real Time data and Json File:

The datas will come to me real time.
Firstly, im keeping them in a json file, and then read this telemetry datas from json.
I add them in a table widget, and choose which data am i want and create a chart with that selected ones.
Im confusing is there any way to keep them in a json. Or is this a very bad idea which i'm trying to do?

It is a bad idea to store chartable data in a JSON file. A database (like an SQLite file, for example) is far more suitable.

[deleted286]

@jsulm yeah, i dont know why im storing datas in json as a config file, my boss wants and i do thats all

[deleted286]

@JKSH thank you, but is there anything wrong which i do as i explain

[JKSH]

@suslucoder said in Real Time data and Json File:

is there anything wrong

Yes, there are problems. Every time new data packets arrive, you must rewrite the whole JSON file.

You won't notice anything wrong when the file is small. But as the file gets bigger, performance will become very bad, and you will wear out your hard drive/SSD faster. The risk of data corruption might also be higher.

my boss wants

I can't understand why your boss wants this.

[deleted286]

@JKSH he thinks that keeping datas on json == creating a config file. Like settings folder. But i know it isnt, so i dont know how can i handle with that issue

[jsulm]

@suslucoder said in Real Time data and Json File:

so i dont know how can i handle with that issue

You could explain to him the disadvantages shown by @JKSH

[deleted286]

@jsulm thank you

[J.Hilk]

@suslucoder well, you could only save the data as a json file, on program close, or something similar.

Fits your requirement and he will never know that the actual data processing/storage is something different.

Doesn't hurt to have redundancies either.

[JKSH]

@J-Hilk said in Real Time data and Json File:

you could only save the data as a json file, on program close, or something similar.

Good idea; this helps avoid the performance issues and hard drive wearing. Beware though: If the program crashes, all of the data will be lost.

[deleted286]

@JKSH i spoke with him, he says he wants a config file with json.

It should include the name of the data, and the type. Like
Name: string
Age: int
Height:float etc.

I dont know how to create such a file

[JonB]

@J-Hilk

and he will never know that the actual data processing/storage is something different.

ROFL. Are you now advising Qt programmers to deceive their bosses? ;-)

@suslucoder

I dont know how to create such a file

What don't you know how to do? You have done JSON stuff, haven't you, so what is different about this task?

[KroMignon]

@suslucoder said in Real Time data and Json File:

I dont know how to create such a file

Have you tried to read JSON documentation?
==> https://doc.qt.io/qt-5/json.html
==> https://doc.qt.io/qt-5/qtcore-serialization-savegame-example.html

[J.Hilk]

@JonB said in Real Time data and Json File:

ROFL. Are you now advising Qt programmers to deceive their bosses? ;-)

😱 me, never!

The boss will get what he want's, in the end. Bosses always only care about the end result 🤷‍♂️

[deleted286]

@J-Hilk ahahahha you made me laugh so much

I create the file, but i dont know how to read such a complex json :D
Can anybody help?

   {
"GPS": [
    {

        "GPS ID": ["integer", "0"],
        "GPS Mod": ["integer", "1"],
        "GPS Utc": ["float", "2"],
        "GPS Latitude": ["float", "3"],
        "GPS Longitude": ["float", "4"],
        "GPS Alt":  ["float", "5"],
        "GPS Yer Hızı":  ["float", "6"],
        "GPS Dikey Hız":["float", "7"],
        "GPS Yatay Doğruluk":  ["float", "8"],
        "GPS Dikey Doğruluk": ["float", "9"],
        "GPS Yer Başı":  ["float", "10"],
        "GPS Hdop": ["float", "11"],
        "GPS Vdop": ["float", "12"],
        "GPS Uydu Sayısı": ["integer", "13"],
        "GPS Boy":  ["integer", "14"]
    } 
  ],


"Imu": [
 {
     
    "HW ID": ["integer", "0"],
        "HW Motor": ["float", "1"],
        "HW Motor1": ["float", "2"],
        "HW Motor2": ["float", "3"],
        "HW Motor3": ["float", "4"],
        "HW Motor4": ["float", "5"],
        "HW P": ["float", "6"],
        "HW R": ["float", "7"],
        "HW Y": ["float", "8"],
        "HW Boy": ["float", "9"]
       }
   ]
     }

[deleted286]

@JonB actually, ı know, i created it with hand, but my question is we have something like

#define TM_AP_ID				0
#define TM_AP_durum 			1
#define TM_AP_hava_hizi			2
#define TM_AP_IMU_pitch			3
#define TM_AP_IMU_roll			4
#define TM_AP_IMU_yaw			5
#define TM_AP_IMU_barometre		6
#define TM_AP_rpm				7

and in my code, i will do some operations like

imu[TM_IMU_pitch].f

The issue is, that definitions should be in json, and i will call them from my json

[jsulm]

@suslucoder said in Real Time data and Json File:

The issue is, that definitions should be in json, and i will call them from my json

What definitions? You can't call anything from JSON. JSON is just a data format. Please be more precise when asking...

[deleted286]

@jsulm

im talking about them

#define TM_AP_ID				        0
#define TM_AP_durum 			        1
#define TM_AP_hava_hizi			2
#define TM_AP_IMU_pitch			3
#define TM_AP_IMU_roll			4
#define TM_AP_IMU_yaw			5
#define TM_AP_IMU_barometre	6
#define TM_AP_rpm				7

[deleted286]

@jsulm said in Real Time data and Json File:

    You can't call anything from JSON. JSON is just a data format. 

Hmm, so im just read json and write json. I cant do anything apart from these

[KroMignon]

@suslucoder said in Real Time data and Json File:

I cant do anything apart from these

I can not follow you, what did you expect to do?
Do you know what JSON is? ==> https://en.wikipedia.org/wiki/JSON

[jsulm]

@suslucoder said in Real Time data and Json File:

im talking about them

So, all these definitions should be defined in your JSON? Then do so. Define them there, read and use the values.