C 獲取鏈接返回 JSON CNDs

#include <stdio.h>
#include <curl/curl.h>
#include <jansson.h>
int main(void) 
{
CURL *curl;
CURLcode res;
char *url = "http://example.com/api/cdns";
char *data;
size_t len;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &data);
res = curl_easy_perform(curl);
if(res != CURLE_OK) {
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
}
curl_easy_cleanup(curl);
}
json_t *root;
json_error_t error;
root = json_loads(data, 0, &error);
if (!root) {
fprintf(stderr, "json_loads error: %s\n", error.text);
return 1;
}
json_t *cdns_object = json_object_get(root, "cdns");
if (!json_is_array(cdns_object)) {
fprintf(stderr, "json is not an array\n");
json_decref(root);
return 1;
}
size_t index;
json_t *value;
json_array_foreach(cdns_object, index, value) {
if (!json_is_string(value)) {
fprintf(stderr, "json is not a string\n");
json_decref(root);
return 1;
}
printf("%s\n", json_string_value(value));
}
json_decref(root);
return 0;
}
size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
{
size_t realsize = size * nmemb;
char *data = (char*)userdata;
data = realloc(data, realsize + 1);
if (data) {
memcpy((data + strlen(data)), ptr, realsize);
*(data + strlen(data) + realsize) = 0;
}
return realsize;
}