Accessing rapidjson::Document array by index - c++

Question

I have this code:
Document dataDoc;
dataDoc.SetArray();
Document::AllocatorType &allocator = dataDoc.GetAllocator();
for (size_t i = 0; i < 10; ++i)
{
ostringstream ss;
ss << "set_" << i + 1 << "_data";
Document doc;
doc.Parse<0>(UserDefault::getInstance()->getStringForKey(ss.str().c_str()).c_str());
dataDoc.PushBack(doc, allocator);
}
There's a rapidjson::Document "dataDoc" and I convert it to an array. Then I fill the array with Document objects that contain JSON objects that are fetched from cocos2d::UserDefault and parsed appropriately.
This is the JSON object that is added to the dataDoc:
{
"people": [
{
"name": "Peter",
"phone": "123",
"address": "Address 456"
},
{
"name": "Helen",
"phone": "123",
"address": "Address 456"
},
{
"name": "John",
"phone": "123",
"address": "Address 456"
}
]
}
Now the dataDoc array contains 10 of these objects.
I know that I can handle one object like this:
Document doc;
rapidjson::Value &people = doc["people"];
string name = people[0]["name"].GetString();
But how can I access, for example, the first object in the dataDoc array by index and get the name value as above?
Edit
Tried also with this code:
vector<string> jsons;
jsons.push_back("{\"people\":[{\"name\":\"Peter\",\"phone\":\"123\",\"address\":\"Address 456\"},{\"name\":\"Helen\",\"phone\":\"123\",\"address\":\"Address 456\"},{\"name\":\"John\",\"phone\":\"123\",\"address\":\"Address 456\"}]}");
jsons.push_back("{\"people\":[{\"name\":\"Peter\",\"phone\":\"123\",\"address\":\"Address 456\"},{\"name\":\"Helen\",\"phone\":\"123\",\"address\":\"Address 456\"},{\"name\":\"John\",\"phone\":\"123\",\"address\":\"Address 456\"}]}");
jsons.push_back("{\"people\":[{\"name\":\"Peter\",\"phone\":\"123\",\"address\":\"Address 456\"},{\"name\":\"Helen\",\"phone\":\"123\",\"address\":\"Address 456\"},{\"name\":\"John\",\"phone\":\"123\",\"address\":\"Address 456\"}]}");
Document dataDoc;
dataDoc.SetArray();
Document::AllocatorType &allocator = dataDoc.GetAllocator();
for (size_t i = 0; i < 3; ++i)
{
Document doc;
doc.Parse<0>(jsons.at(i).c_str());
dataDoc.PushBack(doc, allocator);
}
auto &people = dataDoc[0]["people"];
But it gave me the same error. It points to line 1688 in "document.h" located at ...\cocos2d\external\json\.

Answer 1

First, there seems to be an issue in your code the way you create doc - You need to provide the allocator of dataDoc:
Document doc(&allocator);
Then, rapidjson::Document inherits from rapidjson::Value, so you can simply treat it as a value and use the [] operator:
auto &people = dataDoc[0]["people"];
You can also iterate through the whole document:
for (auto &doc: dataDoc.getArray()) {
auto &people = doc["people"];
}
Prior to C++11:
for (Value::ConstValueIterator itr = dataDoc.Begin();
itr != dataDoc.End(); ++itr) {
auto &people = (*itr)["people"];
}