access arrays with rapidJson (c++)

Question

I am trying to parse a Json file with rapidJson (v 0.11) but I fail to do it with what seems to be a simple array. Here is the structure of my file :

[{"id": "my_id1","type":"my_type1"},
 {"id": "my_id2","type":"my_type2"},
 ...
]

It seems that rapidJson does not read that type of file starting with an array.. Is there a way to handle that ?

Here is a extract of the code I tried to use :

FILE * pFile = fopen ("my_json.json" , "r"); rapidjson::FileStream is(pFile); rapidjson::Document document; document.ParseStream<0>(is); and i am stuck right here because i am supposed to access to the elements by this syntax value = document["key"], but I don't have any "key" at the first level...

welcome to stackoverflow, please reduce your code to the relevant part and post it here — Zaiborg, Apr 09 '15 at 10:54
Which version of rapidjson you use and how you are trying to parse json (code)? — ForEveR, Apr 09 '15 at 10:56
That is not valid JSON. Remove the comma after the second colon in each line. — Wintermute, Apr 09 '15 at 11:00
right sorry i edited it (but that does not solve the problem) — Arcyno, Apr 09 '15 at 11:09
_"i am supposed to access to the elements by this syntax value = document["key"], but I don't have any "key" at the first level..."_ Um `document[0]`? How else do you typically access arrays?? — Lightness Races in Orbit, Apr 09 '15 at 11:51

score 2 · Accepted Answer · answered Apr 09 '15 at 11:34

2

Given that you have an array at the top level of your JSON file, you would simply access your document by providing an index into that array.

For example:

// access first element
rapidjson::Value & val = document[0];

answered Apr 09 '15 at 11:34

zubron

36
1

Thx ! It might seems obvious but it didn't feel that way when i was searching... For those who gets an error message on `document[0]`, you can use `document[0u]` to solve it. – Arcyno Apr 09 '15 at 12:07
In newer versions at [GitHub](https://github.com/miloyip/rapidjson), no need to use `0u`. Please try the latest version. – Milo Yip Apr 15 '15 at 03:24

access arrays with rapidJson (c++)

1 Answers1