Runtime C++ Download [portable] -

void DownloadManager::cancel() m_cancel = true; if (m_downloadThread.joinable()) m_downloadThread.join();

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;

find_package(CURL REQUIRED)

// Example usage #include <iostream> #include <chrono>

int DownloadManager::progressCallback(void* userp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow) auto* ctx = static_cast<DownloadContext*>(userp); if (dltotal > 0) ctx->total_bytes = dltotal; if (ctx->progress_cb) float progress = (float)dlnow / dltotal; ctx->progress_cb(progress, dlnow, dltotal); return 0; // Return non-zero to cancel runtime c++ download

size_t DownloadManager::writeCallback(void* contents, size_t size, size_t nmemb, void* userp) size_t real_size = size * nmemb; auto* ctx = static_cast<DownloadContext*>(userp); if (ctx->file.is_open()) ctx->file.write(static_cast<char*>(contents), real_size); ctx->downloaded_bytes += real_size; // Trigger progress callback if (ctx->progress_cb && ctx->total_bytes > 0) float progress = (float)ctx->downloaded_bytes / ctx->total_bytes; ctx->progress_cb(progress, ctx->downloaded_bytes, ctx->total_bytes); return real_size; return 0;

cmake_minimum_required(VERSION 3.10) project(DownloadManager) set(CMAKE_CXX_STANDARD 17) void DownloadManager::cancel() m_cancel = true

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