json_object_get_boolean : Get boolean value of a json object
json_object_get_boolean() function is used to get the boolean value of a json object. The syntax
boolean json_object_get_boolean(struct json_object *);
It takes json_object as a parameter and returns back an boolean.
The following program demonstrates this. the function json_parse accepts a json_object with one or more key:boolean pairs.
#include <json/json.h>
#include <stdio.h>
void json_parse(json_object * jobj) {
enum json_type type;
json_object_object_foreach(jobj, key, val) {
type = json_object_get_type(val);
switch (type) {
case json_type_boolean: printf("type: json_type_boolean, ");
printf("value: %s\n", json_object_get_boolean(val)? "true": "false");
break;
}
}
}
int main() {
char * string = "{ \"admin\" : true,\
\"reviewer\" : false,\
\"author\" : true\
}";
printf ("JSON string: %s\n", string);
json_object * jobj = json_tokener_parse(string);
json_parse(jobj);
}
Let’s compile the program. If you fail any compilation issues, refer the post.
On executing the program, we get the following output
$ ./a.out
JSON string: { "admin" : true, "reviewer" : false, "author" : true }
type: json_type_boolean, value: true
type: json_type_boolean, value: false
type: json_type_boolean, value: true
As you can see our input to the program was
{
"admin" : true,
"reviewer" : false,
"author" : true
}
with json_object_get_boolean, we are able to get the boolean values.
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