[C Program] curl example code.

[Source Link]

http://curl.haxx.se/libcurl/c/

[Source Code]

// http://curl.haxx.se/libcurl/c/example.html
// http://curl.haxx.se/libcurl/c/curl_easy_setopt.html
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

typedef struct curlResponseData {
    char *response;
    size_t size;
}CURL_RES_DATA;

void initCurlResponseData (CURL_RES_DATA *res) {
    res->size = 0;
    res->response = malloc(res->size+1);

    if ( res->response == NULL ) {
        fprintf(stderr, "malloc() failed\n");
        exit(EXIT_FAILURE);
    }

    res->response[0] = '\0';
}

size_t curlWriteFunction (void *ptr, size_t size, size_t nmemb, CURL_RES_DATA *res) {
    size_t newLen = res->size + size*nmemb;
    res->response = realloc(res->response, newLen+1);
    if (res->response == NULL) {
        fprintf(stderr, "realloc() failed\n");
        exit(EXIT_FAILURE);
    }
    memcpy(res->response+res->size, ptr, size*nmemb);
    res->response[newLen] = '\0';
    res->size = newLen;

    return size*nmemb;
}

int main(int argc, char *argv[]) {
    CURL *curl;
    CURLcode res;
    CURL_RES_DATA resData;

    initCurlResponseData(&resData);

    curl = curl_easy_init();
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com");
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &resData);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlWriteFunction);

        if ( (res = curl_easy_perform(curl)) == 0 ) {
            printf("Everything is OK.\n");
            printf("%s\n", resData.response);
        }

        free(resData.response);

        /* always cleanup */
        curl_easy_cleanup(curl);
    }

    return 0;
}

[Build]

- 위치

mkdir -p /home/jjeong/workspace/curl

cd /home/jjeong/workspace/curl

- prerequisite

http://curl.haxx.se/

http://curl.haxx.se/libcurl/c/

curl-7.25.0.tar.gz

tar -xvzf curl-7.25.0.tar.gz

ln curl-7.25.0 curl

- gcc

gcc curlExample.c ./curl/lib/.libs/libcurl.a -I./curl/include -lssl -lrt -o curlExample