使用 cURLpp 进行多次下载的进度指示器

sudo apt-get install libcurlpp-dev

#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>
#include <curlpp/Infos.hpp>
#include<iostream>
#include <iomanip>
#include<chrono>
#include<thread>

int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        std::cerr << "Usage: "<< argv[0] << " <url>"<< std::endl;
        return 1;
    }

    std::string url = argv[1];

    try
    {
        curlpp::Cleanup cleaner;
        curlpp::Easy request;

        // 设置下载 URL
        request.setOpt(curlpp::Options::Url(url));

        // 设置进度回调函数
        request.setOpt(curlpp::Options::ProgressFunction(
            [](void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow) -> int
            {
                // 计算下载进度百分比
                double progress = (double)dlnow / (double)dltotal * 100.0;

                // 显示下载进度
                std::cout << "下载进度: "<< std::fixed<< std::setprecision(2)<< progress << "%"<< std::endl;

                // 模拟一些耗时操作
                std::this_thread::sleep_for(std::chrono::milliseconds(100));

                return 0;
            }));

        // 执行下载请求
        request.perform();
    }
    catch (const curlpp::RuntimeError &e)
    {
        std::cerr << "Runtime error: " << e.what()<< std::endl;
        return 1;
    }
    catch (const curlpp::LogicError &e)
    {
        std::cerr << "Logic error: " << e.what()<< std::endl;
        return 1;
    }

    return 0;
}

g++ main.cpp -o downloader -lcurlpp -lcurl

./downloader http://example.com/large-file.zip