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Rapidjson Iterating over and Getting Values of Complex JSON Object Members

I have the following JSON object


"prog":[

"iUniqueID":1,
"bGroup":1,
"inFiles":[

"sFileType":"Zonal Data 1",
"bScenarioSpecific":0,
"pos":
"x1":1555,
"y1":-375,
"x2":1879,
"y2":-432

,

"sFileType":"Record File",
"bScenarioSpecific":0,
"pos":
"x1":1555,
"y1":-436,
"x2":1879,
"y2":-493


],
"outFiles":[

"sFileType":"Record File 1",
"bScenarioSpecific":1,
"pos":
"x1":2344,
"y1":-405,
"x2":2662,
"y2":-462


]
,

"iUniqueID":2,
"bGroup":1,
"inFiles":[

"sFileType":"Matrix File 1",
"bScenarioSpecific":0,
"pos":
"x1":98,
"y1":-726,
"x2":422,
"y2":-783

,

"sFileType":"Matrix File 2",
"bScenarioSpecific":0,
"pos":
"x1":98,
"y1":-787,
"x2":422,
"y2":-844


],
"outFiles":[

"sFileType":"Record File 1",
"bScenarioSpecific":1,
"pos":
"x1":887,
"y1":-966,
"x2":1205,
"y2":-1023


]

]



How can I iteratively access the x1 of objects inside "inFiles"? Or in general, how can I access the values stored in sub-array and sub-objects using rapidjson. Here is what I have so far

const Value& prog = document["prog"];

assert(prog.IsArray());

for (rapidjson::Value::ConstValueIterator itr = prog.Begin(); itr != prog.End(); ++itr)




I have tried a variety of things but my code does not compile, therefore I felt like it would need be productive to add it to the description of the issue.

jq

cat f.json | jq .prog.inFiles.pos.x1

2 Answers
2

Here is a way you can iterate over the subarrays inside each array. Using ranged-for loop instead of iterator.

rapidjson::Document doc;
doc.Parse(str); //the one shown in the question


for (auto const& p : doc["prog"].GetArray())
std::cout << p["iUniqueID"].GetInt() << std::endl;
for (auto const& in : p["inFiles"].GetArray())
std::cout << in["sFileType"].GetString() << std::endl;
std::cout << in["pos"]["x1"].GetInt() << std::endl;




Hope this helps.

Here is what ended up working

const Value& prog = d["prog"];
for (Value::ConstValueIterator p = prog.Begin(); p != prog.End(); ++p)
std:cout << (*p)["iUniqueID"].GetInt();
const Value& inFiles = (*p)["inFiles"];
for (Value::ConstValueIterator inFile = inFiles.Begin(); inFile != prog.End(); ++inFile)
std::cout << (*inFile)["sFileType"].GetString() << std::endl;
std::cout << (*inFile)["pos"]["x1"].GetInt() << std::endl;




The post here helped tremendously.

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