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Writing the software
Marcus Ottosson edited this page Jan 25, 2015
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3 revisions
/*Download file from a terminal
Usage:
$ lc_download http://google.com
*/
#include <stdio.h>
#include <libgen.h> // For basename()
#include <curl/curl.h>
int main(int argc, char* args[]) {
// Assume a single argument
if (argc != 2) {
printf("Please enter a URL");
return 1;
}
char *url = args[1];
// Declare a pointer to a CURL *easy* handle
// http://curl.haxx.se/libcurl/c/curl_easy_init.html
CURL *curl;
// If there is any error, this is the variable in which it will be stored.
// http://curl.haxx.se/libcurl/c/curl_easy_strerror.html
CURLcode res;
// This (file-handle) is what we'll use to write to disk
FILE *fp;
// Apparently, this function must be the first function call.
// http://curl.haxx.se/libcurl/c/curl_easy_init.html
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, url);
// Now that we've passed the full url, let's
// get the last part of the URL, which will
// become our file-name.
char *output = basename(args[1]);
fp = fopen(output, "wb");
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
// Perform the request, res will get the return code
res = curl_easy_perform(curl);
if(res != CURLE_OK)
fprintf(stderr, "Could not download file: %s\n",
curl_easy_strerror(res));
// Always cleanup
curl_easy_cleanup(curl);
}
return 0;
}