// Copyright (c) 2020 by Chrono
//
// sudo apt-get remove libcurl4
// sudo apt-get install libcurl4-openssl-dev
//
// curl-config --libs
// curl-config --version
// curl-config --features
// curl-config --protocols
//
// g++ curl.cpp -std=c++11 -lcurl -o a.out;./a.out
// g++ curl.cpp -std=c++14 -lcurl -o a.out;./a.out
#include
#include
#include
using namespace std;
// in curl.h
size_t write_callback(char* ptr, size_t size, size_t nmemb, void* userdata);
void case1()
{
auto curl = curl_easy_init();
assert(curl);
curl_easy_setopt(curl, CURLOPT_URL, "http://nginx.org");
auto res = curl_easy_perform(curl);
if (res != CURLE_OK) {
cout << curl_easy_strerror(res) << endl;
}
curl_easy_cleanup(curl);
}
void case2()
{
//using curl_t = CURL;
auto curl = curl_easy_init();
if (!curl) {
cout << "curl init error" << endl;
return;
}
curl_easy_setopt(curl, CURLOPT_URL, "http://nginx.org");
//curl_easy_setopt(curl, CURLOPT_WRITEDATA, NULL);
#if 0
decltype(&write_callback) f =
[](char *ptr, size_t size, size_t nmemb, void *userdata)
{
cout << "size = " << size * nmemb << endl;
return size * nmemb;
};
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, f);
#endif
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
(decltype(&write_callback))
[](char *ptr, size_t size, size_t nmemb, void *userdata)
{
cout << "size = " << size * nmemb << endl;
return size * nmemb;
}
);
auto res = curl_easy_perform(curl);
if (res != CURLE_OK) {
cout << curl_easy_strerror(res) << endl;
}
curl_easy_cleanup(curl);
}
int main()
{
curl_global_init(CURL_GLOBAL_SSL);
//case1();
case2();
cout << curl_version() << endl;
cout << "libcurl demo" << endl;
curl_global_cleanup();
}