C JSON方式請求

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <jansson.h>
/**
 * @brief 通過Curl庫發送HTTP請求
 * 
 * @param url 請求的URL地址
 * @param headers 請求頭部信息
 * @param post_data POST請求數據
 * @param resp_data 返回的結果數據
 * @return int 0: 成功；其他: 失敗 
 */
int send_request(const char* url, const char* headers, const char* post_data, char** resp_data)
{
CURL* curl;
CURLcode res;
struct curl_slist* list = NULL;
long resp_code = -1;
char errbuf[CURL_ERROR_SIZE] = {0};
size_t resp_size = 0;
curl = curl_easy_init();
if (curl)
{
list = curl_slist_append(list, headers);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_data);
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, strlen(post_data));
/* 保存返回結果到內存中 */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &resp_data);
/* 發送請求 */
res = curl_easy_perform(curl);
/* 檢查HTTP返回代碼 */
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &resp_code);
if (res != CURLE_OK || resp_code != 200)
{
printf("HTTP request failed: %s\n", errbuf);
return -1;
}
/* 清理工作 */
curl_slist_free_all(list);
curl_easy_cleanup(curl);
}
else
{
printf("Curl init failed!\n");
return -1;
}
return 0;
}
/**
 * @brief 處理返回的JSON字符串并打印出來
 * 
 * @param str JSON字符串
 */
void handle_json_str(char* str)
{
json_error_t error;
json_t* root;
json_t* data;
root = json_loads(str, 0, &error);
if (root)
{
printf("JSON Data: \n");
data = json_object_get(root, "data");
printf("title: %s\n", json_string_value(json_object_get(data, "title")));
printf("description: %s\n", json_string_value(json_object_get(data, "description")));
printf("url: %s\n", json_string_value(json_object_get(data, "url")));
json_decref(root);
}
else
{
printf("JSON decode failed: %s\n", error.text);
}
}
int main(int argc, char const* argv[])
{
char* resp_data = NULL;
const char* url = "https://someapi.com/data";
const char* headers = "Content-Type: application/json";
const char* post_data = "{\"query\":\"java\",\"limit\":10}";
if (send_request(url, headers, post_data, &resp_data) == 0)
{
handle_json_str(resp_data);
}
return 0;
}