int main() DownloadManager dm; DownloadManager::DownloadOptions options; options.url = "https://example.com/file.zip"; options.output_path = "downloaded_file.zip"; options.max_retries = 2; options.resume_on_failure = true; std::cout << "Starting download..." << std::endl; auto start_time = std::chrono::steady_clock::now(); // Async download with callbacks dm.downloadAsync(options, // Progress callback [](float progress, size_t downloaded, size_t total) std::cout << "\rProgress: " << (progress * 100) << "% (" << downloaded << "/" << total << " bytes)" << std::flush; , // Complete callback [&start_time](bool success, const std::string& error) auto end_time = std::chrono::steady_clock::now(); auto duration = std::chrono::duration_cast<std::chrono::seconds>(end_time - start_time); if (success) std::cout << "\nDownload completed in " << duration.count() << " seconds!" << std::endl; else std::cout << "\nDownload failed: " << error << std::endl; ); // Wait for completion while (dm.isActive()) std::this_thread::sleep_for(std::chrono::milliseconds(100)); return 0;
// download_manager.h #pragma once #include <string> #include <functional> #include <thread> #include <atomic> #include <fstream> #include <memory> #include <curl/curl.h> runtime c++ download
target_link_libraries(downloader $CURL_LIBRARIES) target_include_directories(downloader PRIVATE $CURL_INCLUDE_DIRS) int main() DownloadManager dm
void DownloadManager::cancel() m_cancel = true; if (m_downloadThread.joinable()) m_downloadThread.join(); options.url = "https://example.com/file.zip"
# Install libcurl (Ubuntu/Debian) sudo apt-get install libcurl4-openssl-dev mkdir build && cd build cmake .. && make Run ./downloader
DownloadManager::~DownloadManager() cancel(); if (m_downloadThread.joinable()) m_downloadThread.join(); if (m_curl) curl_easy_cleanup(m_curl); curl_global_cleanup();
bool DownloadManager::downloadSync(const DownloadOptions& options, ProgressCallback progress) m_cancel = false; m_lastError.clear(); if (!m_curl) m_lastError = "CURL not initialized"; return false; m_context = std::make_unique<DownloadContext>(); m_context->progress_cb = progress; m_context->output_path = options.output_path; // Check if file exists for resume size_t existing_size = 0; if (options.resume_on_failure) existing_size = getFileSize(options.output_path); m_context->resume_mode = (existing_size > 0); // Open file in appropriate mode std::ios::openmode mode = std::ios::out