Runtime C++ Download [verified] Official

cmake_minimum_required(VERSION 3.10) project(DownloadManager) set(CMAKE_CXX_STANDARD 17)

(for building):

// Helper: Get file size size_t getFileSize(const std::string& path) struct stat stat_buf; if (stat(path.c_str(), &stat_buf) == 0) return stat_buf.st_size; return 0; runtime c++ download

# Install libcurl (Ubuntu/Debian) sudo apt-get install libcurl4-openssl-dev mkdir build && cd build cmake .. && make Run ./downloader cmake_minimum_required(VERSION 3

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; &stat_buf) == 0) return stat_buf.st_size