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@ericdke
Last active September 24, 2023 06:42
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C++: Download a file using HTTP GET and store in in a std::string
/**
* HTTPDownloader.hpp
*
* A simple C++ wrapper for the libcurl easy API.
*
* Written by Uli Köhler (techoverflow.net)
* Published under CC0 1.0 Universal (public domain)
*/
#ifndef HTTPDOWNLOADER_HPP
#define HTTPDOWNLOADER_HPP
#include <string>
#include <curl/curl.h>
#include <curl/easy.h>
#include <curl/curlbuild.h>
#include <sstream>
#include <iostream>
/**
* A non-threadsafe simple libcURL-easy based HTTP downloader
*/
class HTTPDownloader {
public:
HTTPDownloader();
~HTTPDownloader();
/**
* Download a file using HTTP GET and store in in a std::string
* @param url The URL to download
* @return The download result
*/
std::string download(const std::string& url);
private:
void* curl;
};
#endif /* HTTPDOWNLOADER_HPP */
/**
* HTTPDownloader.cpp
*
* A simple C++ wrapper for the libcurl easy API.
*
* Written by Uli Köhler (techoverflow.net)
* Published under CC0 1.0 Universal (public domain)
*/
#include "Downloader.hpp"
using namespace std;
size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream) {
string data((const char*) ptr, (size_t) size * nmemb);
*((stringstream*) stream) << data << endl;
return size * nmemb;
}
HTTPDownloader::HTTPDownloader() {
curl = curl_easy_init();
}
HTTPDownloader::~HTTPDownloader() {
curl_easy_cleanup(curl);
}
string HTTPDownloader::download(const std::string& url) {
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
/* we tell libcurl to follow redirection */
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1); //Prevent "longjmp causes uninitialized stack frame" bug
curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "deflate");
std::stringstream out;
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &out);
/* Perform the request, res will get the return code */
CURLcode res = curl_easy_perform(curl);
/* Check for errors */
if (res != CURLE_OK) {
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
}
return out.str();
}
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