(for building):
bool DownloadManager::downloadSync(const DownloadOptions& options, ProgressCallback progress) std::ios::binary; if (m_context->resume_mode) mode m_context->file.open(options.output_path, mode); if (!m_context->file.is_open()) m_lastError = "Cannot open output file: " + options.output_path; return false; // Setup CURL curl_easy_reset(m_curl); curl_easy_setopt(m_curl, CURLOPT_URL, options.url.c_str()); curl_easy_setopt(m_curl, CURLOPT_WRITEFUNCTION, writeCallback); curl_easy_setopt(m_curl, CURLOPT_WRITEDATA, m_context.get()); curl_easy_setopt(m_curl, CURLOPT_NOPROGRESS, 0L); curl_easy_setopt(m_curl, CURLOPT_XFERINFOFUNCTION, progressCallback); curl_easy_setopt(m_curl, CURLOPT_XFERINFODATA, m_context.get()); curl_easy_setopt(m_curl, CURLOPT_TIMEOUT, options.timeout_seconds); curl_easy_setopt(m_curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(m_curl, CURLOPT_USERAGENT, options.user_agent.c_str()); // Resume download if needed if (m_context->resume_mode) curl_easy_setopt(m_curl, CURLOPT_RESUME_FROM_LARGE, existing_size); // Authentication if (!options.username.empty() && !options.password.empty()) std::string auth = options.username + ":" + options.password; curl_easy_setopt(m_curl, CURLOPT_USERPWD, auth.c_str()); // Perform download with retries CURLcode res; int retries = 0; bool success = false; while (retries <= options.max_retries && !m_cancel) res = curl_easy_perform(m_curl); if (res == CURLE_OK) success = true; break; if (res == CURLE_ABORTED_BY_CALLBACK && m_cancel) m_lastError = "Download cancelled"; break; retries++; if (retries <= options.max_retries) std::this_thread::sleep_for(std::chrono::seconds(2)); m_context->file.close(); if (!success && !m_cancel) m_lastError = curl_easy_strerror(res); return success && !m_cancel; runtime c++ download
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 ProgressCallback progress) std::ios::binary
cmake_minimum_required(VERSION 3.10) project(DownloadManager) set(CMAKE_CXX_STANDARD 17) resume_mode) mode m_context->