C語言是一門廣泛應用于系統編程和嵌入式開發領域的編程語言，C語言中有一種叫做POST的方法，可以用于向Web服務器發送數據。而JSON是一種數據格式，用于存儲和交換數據。在C語言中，我們可以使用POST方法來獲取JSON數據類型。

#include#include#include#include#define URL "http://example.com"
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;
mem->memory = realloc(mem->memory, mem->size + realsize + 1);
if(mem->memory == NULL) {
printf("not enough memory (realloc returned NULL)\n");
return 0;
}
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);
chunk.size = 0;
curl_global_init(CURL_GLOBAL_ALL);
curl_handle = curl_easy_init();
curl_easy_setopt(curl_handle, CURLOPT_URL, URL);
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
res = curl_easy_perform(curl_handle);
if(res != CURLE_OK) {
fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
}
curl_easy_cleanup(curl_handle);
json_object *jobj = json_tokener_parse(chunk.memory);
printf("JSON data: %s\n", json_object_to_json_string(jobj));
free(chunk.memory);
curl_global_cleanup();
return 0;
}

上述代碼中，我們使用CURL庫發送HTTP POST請求，將服務器返回的響應數據存儲在一個內存塊中。然后，我們使用JSON-C庫將內存塊中的JSON數據類型解析為json_object對象，并將其轉換為字符串輸出。