C語(yǔ)言中，要通過(guò)JSON獲取數(shù)組，需要用到一個(gè)開源庫(kù)——json-c。這個(gè)庫(kù)提供了許多函數(shù)，用于解析JSON數(shù)據(jù)，并且能夠靈活、高效地處理數(shù)組。

#include <stdio.h>
#include <json-c/json.h>
int main() {
const char* json_string = "{\"name\": \"Tina\", \"age\": 20, \"hobbies\": [\"reading\", \"singing\", \"dancing\"]}";
struct json_object* json_object = json_tokener_parse(json_string);
struct json_object* hobbies_object = NULL;
if (json_object_object_get_ex(json_object, "hobbies", &hobbies_object)) {
if (json_object_is_type(hobbies_object, json_type_array)) {
int hobbies_count = json_object_array_length(hobbies_object);
printf("Tina has %d hobbies:\n", hobbies_count);
for (int i = 0; i < hobbies_count; i++) {
struct json_object* hobby_object = json_object_array_get_idx(hobbies_object, i);
printf("%d: %s\n", i + 1, json_object_get_string(hobby_object));
}
} else {
printf("Hobbies is not an array!\n");
}
} else {
printf("Cannot find key 'hobbies' in JSON data!\n");
}
json_object_put(json_object);
return 0;
}

上面這段代碼演示了如何獲取JSON數(shù)據(jù)中的

hobbies

數(shù)組。首先，需要將JSON字符串解析成JSON對(duì)象，使用json_tokener_parse函數(shù)就可以實(shí)現(xiàn)。接下來(lái)，通過(guò)json_object_object_get_ex函數(shù)獲取到

hobbies

對(duì)象，再用json_object_is_type函數(shù)判斷是否為數(shù)組類型，如果是，就可以計(jì)算數(shù)組長(zhǎng)度，并且通過(guò)json_object_array_get_idx函數(shù)訪問(wèn)數(shù)組元素。最后，記得釋放JSON對(duì)象的內(nèi)存，調(diào)用json_object_put函數(shù)即可。