Populating a document tree from JSON string
The following code snippet shows an example of how to populate an instance of
document_tree
from a JSON string, and navigate its
content tree afterward.
#include <orcus/json_document_tree.hpp>
#include <orcus/config.hpp>
#include <cstdlib>
#include <iostream>
using namespace std;
const char* json_string = "{"
" \"name\": \"John Doe\","
" \"occupation\": \"Software Engineer\","
" \"score\": [89, 67, 90]"
"}";
int main()
{
using node = orcus::json::node;
orcus::json_config config; // Use default configuration.
orcus::json::document_tree doc;
doc.load(json_string, config);
// Root is an object containing three key-value pairs.
node root = doc.get_document_root();
for (std::string_view key : root.keys())
{
node value = root.child(key);
switch (value.type())
{
case orcus::json::node_t::string:
// string value
cout << key << ": " << value.string_value() << endl;
break;
case orcus::json::node_t::array:
{
// array value
cout << key << ":" << endl;
for (size_t i = 0; i < value.child_count(); ++i)
{
node array_element = value.child(i);
cout << " - " << array_element.numeric_value() << endl;
}
break;
}
default:
;
}
}
return EXIT_SUCCESS;
}
You’ll see the following output when executing this code:
name: John Doe
occupation: Software Engineer
score:
- 89
- 67
- 90