How to construct JSON array with Parson? - c

Question

I'm using Parson library to send sensor data from a MCU to a server. I want to generate the following JSON, but I can't figure out how to generate the arrays ("sensors" and "measurements").
{
"systemInfo:": {
"hubId": "1234",
"battery:": {
"value": 3.3,
"unit": "V"
}
},
"sensors": [
{
"name": "S1",
"measurements:": [
{
"measuredValue": "val",
"value": 123,
"unit": "unit"
}
]
},
{
"name": "S2",
"measurements": [
{
"measuredValue": "val1",
"value": 123,
"unit": "unit1"
},
{
"measuredValue": "val2",
"value": 123,
"unit": "unit2"
}
]
},
{
"name": "s3",
"measurements": [
{
"measuredValue": "val",
"value": 120,
"unit": "unit"
}
]
}
]
}
There is an example on the GitHub page (serialization_example), that generates an array by parsing a string:
json_object_dotset_value(root_object, "contact.emails",
json_parse_string("[\"email#example.com\", \"email2#example.com\"]"));
but I would like to generate it using the API functions and not by manually constructing the string like in the example above. E.g., by using
json_object_set_string()
json_object_dotset_string()
json_object_dotset_number() etc.
Is it possible? Or the API does not offer this functionality?

Answer 1

I was stuck at this same point but as I looked into parson.h and parson.c I found support for Json_Array. here is just a sample code to help.
//creating a Json_Array
JSON_Value *branch = json_value_init_array();
JSON_Array *leaves = json_value_get_array(branch);
//creating measurement Json
JSON_Value *leaf_value = json_value_init_object();
JSON_Object *leaf_object = json_value_get_object(leaf_value);
json_object_set_number(leaf_object,"name1",123);
json_object_set_number(leaf_object,"name2",456);
json_object_set_number(leaf_object,"name3",789);
json_array_append_value(leaves,leaf_value);
Hope this helps.

Answer 2

I didn't find a solution to my problem, but instead in found another library, cJSON, that can do what I need.