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c get api json數據庫

林雅南2年前9瀏覽0評論

C語言是一種通用的高級編程語言,它可以被用于編寫操作系統、驅動程序、桌面應用程序和嵌入式系統等多種類型的應用程序。在這些應用程序中,需要使用數據庫來存儲和管理數據。在C語言中,我們可以使用JSON數據庫來進行存儲和管理數據。

#include#include#include#include#include#define URL "https://jsonplaceholder.typicode.com/users"
struct MemoryStruct {
char *memory;
size_t size;
};
static size_t
WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)userp;
char *ptr = realloc(mem->memory, mem->size + realsize + 1);
if(ptr == NULL) {
/* out of memory! */
printf("not enough memory (realloc returned NULL)\n");
return 0;
}
mem->memory = ptr;
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
int main(void)
{
CURL *curl_handle;
CURLcode res;
struct MemoryStruct chunk;
chunk.memory = malloc(1); // will be grown as needed by the realloc above
chunk.size = 0; // no data at this point
curl_global_init(CURL_GLOBAL_ALL);
// init the curl session
curl_handle = curl_easy_init();
// specify URL to get
curl_easy_setopt(curl_handle, CURLOPT_URL, URL);
// send all data to this function
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
// we pass our 'chunk' struct to the callback function
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
// some servers don't like requests that are made without a user-agent
// field, so we provide one
curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
// get it!
res = curl_easy_perform(curl_handle);
// check for errors
if(res != CURLE_OK) {
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
}
else {
printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
// parse json data
json_object *jobj = json_tokener_parse(chunk.memory);
printf("Parsed JSON: %s\n", json_object_to_json_string_ext(jobj, JSON_C_TO_STRING_SPACED | JSON_C_TO_STRING_PRETTY));
}
// cleanup curl stuff
curl_easy_cleanup(curl_handle);
free(chunk.memory);
// we're done with libcurl, so clean it up
curl_global_cleanup();
return 0;
}

以上代碼使用Curl獲取JSON數據并將其解析為JSON對象。然后,我們打印了解析后的JSON對象。我們可以使用這種方式獲取和解析JSON數據,并存儲在數據庫中以供以后使用。