MFC (Microsoft Foundation Class Library)中的各種類結(jié)合起來構(gòu)成了一個應用程序框架，它的目的就是讓程序員在此基礎上來建立Windows下的應用程序，這是一種相對SDK來說更為簡單的方法。因為總體上，MFC框架定義了應用程序的輪廓，并提供了用戶接口的標準實現(xiàn)方法，程序員所要做的就是通過預定義的接口把具體應用程序特有的東西填入這個輪廓。Microsoft Visual C++提供了相應的工具來完成這個工作：AppWizard可以用來生成初步的框架文件（代碼和資源等）；資源編輯器用于幫助直觀地設計用戶接口；ClassWizard用來協(xié)助添加代碼到框架文件；最后，編譯，則通過類庫實現(xiàn)了應用程序特定的邏輯。
Sofia SIP is an open-source SIP User-Agent Library, compliant with
the IETF RFC3261 specification. It can be used as a building block
for SIP client software for uses such as VoIP, IM, and many other
real-time and person-to-person communication services. The primary
target platform for Sofia SIP is GNU/Linux. Sofia SIP is based on a
SIP stack developed at the Nokia Research Center. Sofia SIP is
licensed under the LGPL.
JLayer is a Library that decodes/plays/converts MPEG 1/2/2.5 Layer 1/2/3
(i.e. MP3) in real time for the JAVA(tm) platform.
and anyone can add his contribution. JLayer is licensed under LGPL (see LICENSE.txt).
