json-glib的用法

#include <stdlib.h>
#include <stdio.h>
#include <glib-object.h>
#include <json-glib/json-glib.h>

int main(void)
{
    JsonBuilder *builder = json_builder_new();

    json_builder_begin_object(builder);
    json_builder_set_member_name(builder, "array");

    json_builder_begin_array(builder);

    json_builder_begin_object(builder);
    json_builder_set_member_name(builder, "name");
    json_builder_add_string_value(builder, "charles");

    json_builder_set_member_name(builder, "age");
    json_builder_add_int_value(builder, 20);
    json_builder_end_object(builder);

    json_builder_begin_object(builder);
    json_builder_set_member_name(builder, "name");
    json_builder_add_string_value(builder, "May");

    json_builder_set_member_name(builder, "age");
    json_builder_add_int_value(builder, 21);
    json_builder_end_object(builder);

    json_builder_end_array(builder);

    json_builder_end_object(builder);

    JsonNode *node = json_builder_get_root(builder);
    g_object_unref( builder);
    JsonGenerator *generator = json_generator_new();
    json_generator_set_root(generator, node);
    gchar *data = json_generator_to_data(generator, NULL);
    printf("%s\n", data);
    json_node_free(node);
    g_object_unref(generator);
    free(data);
    return 0;
}

输出的结果
{"array":[{"name":"charles","age":20},{"name":"May","age":21}]}

————————————————
版权声明：本文为CSDN博主「CaspianSea」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/CaspianSea/article/details/80636971

    //generate
　　 //另一个版本的

    int main(int argc, char* argv[])
    {
        g_type_init();
        JsonObject *obj = json_object_new();
        json_object_set_string_member(obj, "name", "john");
        json_object_set_int_member(obj, "age", 18);
        
        JsonArray *arr = json_array_new();
        json_array_add_string_element(arr, "lily");
        json_array_add_string_element(arr, "mark");
        json_object_set_array_member(obj, "friends", arr);

        //generate
        JsonGenerator *g = json_generator_new();
        JsonNode *root = json_node_new(JSON_NODE_OBJECT);
        json_node_set_object(root, obj);
        json_generator_set_root(g, root);
        json_generator_to_file(g, "ex.json", NULL);
        return 0;
    }

    //prase
    int main(int argc, char* argv[])
    {
        g_type_init();
        JsonParser *p = json_parser_new();
        gboolean ret;
        ret = json_parser_load_from_file(parser, fill_name, NULL);
        if (!ret)
        {…}
        JsonNode *root = json_node_new(JSON_NODE_OBJECT);
        root = json_parser_get_root(parse);
        JsonObject *obj = json_object_new();
        obj = json_node_get_object(root);
        // 以下可对obj进行get操作
        …
        return 0;
    }

#include<json-glib/json-glib.h>
#include<stdio.h>
#include<string.h>
int main()
{
//生成json
    g_type_init();
    JsonObject *obj = json_object_new();
    json_object_set_string_member(obj, "name", "john");
    json_object_set_int_member(obj, "age", 18);
    
    JsonArray *arr = json_array_new();
    json_array_add_string_element(arr, "lily");//{"name":"john","age":18,"friends":["lily","mark"]}
    json_array_add_string_element(arr, "mark");
    json_object_set_array_member(obj, "friends", arr);
    
    JsonGenerator *g = json_generator_new();
    JsonNode *root = json_node_new(JSON_NODE_OBJECT);
    json_node_set_object(root, obj);
    json_generator_set_root(g, root);
    json_generator_to_file(g, "ex.json", NULL);
 
//解析！！！

　　/*{"name":"john","age":18,"friends":["lily","mark"]}*/



    JsonParser *parser = json_parser_new();
        JsonNode *node = json_node_new(JSON_NODE_OBJECT);
        json_parser_load_from_file(parser, "ex.json", NULL);
        node = json_parser_get_root(parser);
        JsonObject *obj2 = json_object_new();
        obj2 = json_node_get_object(node);
    const char *aaa = json_object_get_string_member(obj2, "name");
    const int aa = json_object_get_int_member(obj2, "age");
    printf("%s\n", aaa);
    printf("%d\n", aa);
 
    JsonArray *array = json_array_new();
    array = json_object_get_array_member(obj2, "friends");
    const char *bbb = json_array_get_string_element(array, 0);    
    const char *bb = json_array_get_string_element(array, 1);    
    printf("%s\n", bbb);
    printf("%s\n", bb);
    return 0;
}

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