Poco是一组C++类库，内容非常丰富（具有600多个头文件），历史悠久，代码质量优秀。

官方网站：

http://pocoproject.org/

Modern, powerful open source C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems.

Overview
Design & Implementation	Written in modern, standard ANSI C++, using the C++ Standard Library. Modular design, very few external dependencies, builds out-of-the-box. Good mix of "classic" object-oriented design with modern C++. Clean, easy-to-understand code (we frequently get compliments on that), consistent coding style, comprehensive test suite.
Platforms	Desktop/Server: Windows, Linux, Mac OS X, Solaris, HP-UX, AIX Embedded/Mobile: Windows Embedded CE, Embedded Linux (uClibc or glibc), iOS, Android, QNX, VxWorks Minimum system requirements: 75 MHz ARM9, 8 MB RAM (Embedded Linux).
License	Boost Software License 1.0
Core Features	Any and DynamicAny classes for dynamic typing cache framework date and time events (signal/slot mechanism) and notifications framework regular expressions (based on PCRE) shared libraries and class loading smart pointers and memory management (buffer, pool) string formatting and string utilities tuples
Compression	stream classes for zlib-based compression/decompression ZIP file creation and extraction
Cryptography	cryptographic hashes X509 certificate handling symmetric and RSA ciphers streams for encryption and decryption based on OpenSSL
Database	unified access to different SQL databases (SQLite, MySQL, ODBC) automatic data type mappings collections support (std::vector, std::set, std::map, etc.) record sets and tuples session pooling
Filesystem	platform-independent path construction and manipulation directory listing globbing directory change notifications file attributes
Logging	extensible logging framework with pluggable log channels and message formatters console logging, log files, syslog, remote syslog, Windows event log service
Multithreading	thread and thread synchronization classes thread pool work queues active objects and activities task management timers
Network	stream, datagram, multicast, server and raw sockets TCP Server framework (multithreaded) reactor server framework HTTP(S) client and server framework HTTP Basic and Digest authentication C++ server page compiler for embedding C++ code into HTML pages FTP client SMTP and POP3 client for sending and receiving email URI and UUID handling HTML forms processing MIME multipart messages SSL/TLS support based on OpenSSL WebSocket (RFC 6455) client and server
Processes and IPC	launching and stopping processes process synchronization shared memory
Streams	Base64 and HexBinary encoding/decoding compression (zlib) line ending conversion memory streams text encoding conversions URI stream opener
Text Encodings	UTF-8 and Unicode handling text encodings and conversions character classifications
Utility Classes	frameworks for command-line and server applications command-line options handling configuration file parsing unix daemons and windows services
XML	fast XML parsing based on Expat SAX2 (Simple API for XML, version 2) parser DOM (Document Object Model, Level 1-3) parser XML writer