Curl_Player

curl_play.c

//
//  main.c
//  PointerPlayer
//
//  Created by Vicent Tsai on 16/3/1.
//  Copyright © 2016年 HeZhi Corp. All rights reserved.
//

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <curl/curl.h>
#include <curl/easy.h>

void safeFree(void** pp) {
    if (pp != NULL & *pp != NULL) {
        free(*pp);
        *pp = NULL;
    }
}

#define safeFree(p) safeFree((void**)&(p))

typedef struct _buffer {
    char *buffer;
    size_t size;
} Buffer;

static size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data) {
    size_t realsize = size * nmemb;
    Buffer *mem = (Buffer*)data;
    mem->buffer = realloc(mem->buffer, mem->size+realsize+1);

    if (mem->buffer) {
        memcpy(&(mem->buffer[mem->size]), ptr, realsize);
        mem->size += realsize;
        mem->buffer[mem->size] = 0;
    }

    return realsize;
}

int main(int argc, char const* argv[]) {
    curl_global_init(CURL_GLOBAL_ALL);

    CURL *handler;
    CURLcode result;
    long http_code;
    double content_length;
    Buffer output;

    FILE *fp;
    fp = fopen("/tmp/fun.html", "w");
    if (!fp) {
        return 1;
    }

    output.buffer = NULL;
    output.size = 0;
    handler = curl_easy_init();

    curl_easy_setopt(handler, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
    curl_easy_setopt(handler, CURLOPT_WRITEDATA, (void *)&output);
    curl_easy_setopt(handler, CURLOPT_URL, "http://www.v2ex.com");

    result = curl_easy_perform(handler);
    if (result == 0) {
        fprintf(fp, "%s\n", output.buffer);
        fclose(fp);

        printf("file downloaded\n");
    } else {
        printf("ERROR in dowloading file\n");
        fclose(fp);
    }

    printf("get http return code\n");
    curl_easy_getinfo(handler, CURLINFO_RESPONSE_CODE, &http_code);
    printf("http code: %lu\n", http_code);

    printf("get size of download page\n");
    curl_easy_getinfo(handler, CURLINFO_SIZE_DOWNLOAD, &content_length);
    printf("length: %g\n", content_length);
    printf("buffer size: %zu\n", output.size);

    curl_easy_cleanup(handler);

    if (output.buffer) {
        printf("%.*s\n", 100, output.buffer+10);

        safeFree(output.buffer);
        output.size = 0;
    }

    return 0;
}