Re: [jansson-users] Re: How to know size in bytes of encoded json object

[Petri Lehtinen]

Hi!

You can use strlen(pPktOut) to get the length of the JSON.

Petri 

alberto cirillo <cirillo...@gmail.com> kirjoitti 5.7.2020 kello 11.49:



Just to be clearer, the json_dumps method returns the JSON representation of root as a string. How could I know the length of the string (i.e. the amount of bytes of the json)?

Il giorno domenica 5 luglio 2020 10:44:08 UTC+2, alberto cirillo ha scritto:

Using the example reported below, I should send on a socket the built JSON object but to do that I need its exact amount of bytes. Is there a way to know the size of the root object (or, in case of a json_dumps, the size of the returned area)?

 

======= EXAMPLE

json_t* root = json_object();

json_object_set_new(root, "test1", json_string("TEST"));
json_object_set_new(root, "test2", json_integer(1));
json_object_set_new(root, "test3", json_integer(1));

pPktOut = json_dumps(root, 0);

json_decref(root);

=====

Thanks

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