在C語言中，我們可以通過POST方式獲取JSON數據類型的信息。具體的實現過程如下：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
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("ERROR: 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, "http://example.com/api");
curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}");
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) {
printf("curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
}
else {
printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
printf("%s\n", chunk.memory);
}
curl_easy_cleanup(curl_handle);
free(chunk.memory);
curl_global_cleanup();
return 0;
}

以上代碼中，我們使用了libcurl庫來構建C程序，用于通過POST方式獲取JSON數據類型的信息。在代碼中，我們先定義了一個結構體`MemoryStruct`，用于存儲獲取的數據。然后，我們在main函數中，創建了一個`curl_handle`句柄，用于發送POST請求。同時，我們將JSON數據類型的信息作為POST請求提交到指定的URL。獲取到數據后，通過`WriteMemoryCallback`函數將數據存儲到`MemoryStruct`結構體中。最后，我們通過printf函數輸出獲取到的數據。