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c json中的數據格式

林雅南2年前8瀏覽0評論

在C語言中,可以使用JSON(JavaScript Object Notation)來存儲和傳輸數據。

JSON是一種輕量級的文本數據格式,具有良好的可讀性和易于使用的特性。它由鍵-值對組成,用逗號分隔,并通過大括號封裝。值可以是字符串、數字、布爾值、數組和對象。

{
"name": "張三",
"age": 25,
"married": false,
"hobbies": ["籃球", "游泳", "唱歌"],
"address": {
"province": "廣東",
"city": "深圳",
"street": "科技南路"
}
}

在C中,可以使用第三方庫來解析和生成JSON數據。常用的庫有cJSON和Jansson。

cJSON是一個輕量級的JSON解析器,具有良好的可移植性和易于使用的API。它的數據結構也是由鍵-值對組成,用指針鏈接,并通過結構體封裝。成員可以是字符串、數字、布爾值、數組和對象。

#include#include#include "cJSON.h"
int main() {
cJSON *json = cJSON_CreateObject();
cJSON_AddStringToObject(json, "name", "張三");
cJSON_AddNumberToObject(json, "age", 25);
cJSON_AddBoolToObject(json, "married", 0);
cJSON *hobbies = cJSON_CreateArray();
cJSON_AddItemToArray(hobbies, cJSON_CreateString("籃球"));
cJSON_AddItemToArray(hobbies, cJSON_CreateString("游泳"));
cJSON_AddItemToArray(hobbies, cJSON_CreateString("唱歌"));
cJSON_AddItemToObject(json, "hobbies", hobbies);
cJSON *address = cJSON_CreateObject();
cJSON_AddStringToObject(address, "province", "廣東");
cJSON_AddStringToObject(address, "city", "深圳");
cJSON_AddStringToObject(address, "street", "科技南路");
cJSON_AddItemToObject(json, "address", address);
char *data = cJSON_Print(json);
printf("%s\n", data);
cJSON_Delete(json);
free(data);
return 0;
}

Jansson也是一個輕量級的JSON庫,具有高性能和可擴展性,支持JSON的各種功能(如Unicode轉義、數字精度和枚舉類型)。它的數據結構也是由鍵-值對組成,用指針鏈接,并通過結構體封裝。成員可以是字符串、數字、布爾值、數組和對象。

#include#includeint main() {
json_t *json = json_object();
json_object_set_new(json, "name", json_string("張三"));
json_object_set_new(json, "age", json_integer(25));
json_object_set_new(json, "married", json_false());
json_t *hobbies = json_array();
json_array_append_new(hobbies, json_string("籃球"));
json_array_append_new(hobbies, json_string("游泳"));
json_array_append_new(hobbies, json_string("唱歌"));
json_object_set_new(json, "hobbies", hobbies);
json_t *address = json_object();
json_object_set_new(address, "province", json_string("廣東"));
json_object_set_new(address, "city", json_string("深圳"));
json_object_set_new(address, "street", json_string("科技南路"));
json_object_set_new(json, "address", address);
char *data = json_dumps(json, JSON_INDENT(4));
printf("%s\n", data);
json_decref(json);
free(data);
return 0;
}