Parsing a JSON array of objects

Firmware
1

I am having some difficulties trying to parse the JSON below. The "Entries" Key has a value which is an array of objects, with each object containing three key value pairs.
I can iterate over the data to find the Entries key, but cannot seem to get the correct code to iterate over the array of objects and access the key value pairs within it.

Can someone help me with this please?

{"RW":true,"FEAT":"PLCID_BATCH","Entries":[{"List":1,"Entry":0,"ID":"5AB123"},{"List":1,"Entry":1,"ID":"5AB124"},{"List":1,"Entry":2,"ID":"5AB125"},{"List":1,"Entry":3,"ID":"5AB126"},{"List":1,"Entry":4,"ID":"5AB127"}]}

2

Code:

#include "Particle.h"

SYSTEM_MODE(SEMI_AUTOMATIC);
SYSTEM_THREAD(ENABLED);
SerialLogHandler logHandler(LOG_LEVEL_INFO);

const char *jsonStr = "{\"RW\":true,\"FEAT\":\"PLCID_BATCH\",\"Entries\":[{\"List\":1,\"Entry\":0,\"ID\":\"5AB123\"},{\"List\":1,\"Entry\":1,\"ID\":\"5AB124\"},{\"List\":1,\"Entry\":2,\"ID\":\"5AB125\"},{\"List\":1,\"Entry\":3,\"ID\":\"5AB126\"},{\"List\":1,\"Entry\":4,\"ID\":\"5AB127\"}]}";

void setup() {
    Particle.connect();
}

void loop() {
    JSONValue outerObj = JSONValue::parseCopy(jsonStr);
    JSONObjectIterator outerIter(outerObj);
    while(outerIter.next()) {
        if (outerIter.name() == "Entries") {
            JSONArrayIterator entriesIter(outerIter.value());
            while(entriesIter.next()) {
                JSONObjectIterator entryIter(entriesIter.value());
                while(entryIter.next()) {
                    Log.info("entry key=%s value=%s", 
                        (const char *) entryIter.name(), 
                        (const char *) entryIter.value().toString());
                }

            }
        }
        else {
            Log.info("key=%s value=%s", 
                (const char *) outerIter.name(), 
                (const char *) outerIter.value().toString());
        }
    }
    delay(5000);
}

Output:

0000017769 [app] INFO: key=RW value=true
0000017779 [app] INFO: key=FEAT value=PLCID_BATCH
0000017792 [app] INFO: entry key=List value=1
0000017803 [app] INFO: entry key=Entry value=0
0000017814 [app] INFO: entry key=ID value=5AB123
0000017826 [app] INFO: entry key=List value=1
0000017838 [app] INFO: entry key=Entry value=1
0000017849 [app] INFO: entry key=ID value=5AB124
0000017861 [app] INFO: entry key=List value=1
0000017875 [app] INFO: entry key=Entry value=2
0000017887 [app] INFO: entry key=ID value=5AB125
0000017899 [app] INFO: entry key=List value=1
0000017910 [app] INFO: entry key=Entry value=3
0000017922 [app] INFO: entry key=ID value=5AB126
0000017934 [app] INFO: entry key=List value=1
0000017945 [app] INFO: entry key=Entry value=4
0000017956 [app] INFO: entry key=ID value=5AB127
3 Likes
3

Thanks for that, I was very close.

4

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.