说明：  PFC实例是参照PB6.51版本的PFC的example做的，里面的注释基本都是用中文重新写过，方便大家阅读，本PFC实例没有使用SQLSPY、DEBUG服务和数据窗口属性服务，但是增加了一些实例，如：带进度条的检索工具，SQL语法分析，数据窗口缓存服务等。
(PFC PB6.51 example is the reference version of the example of PFC done inside of the Notes which are re-written in Chinese, facilitate reading, the examples do not use PFC SQLSPY, DEBUG window service attributes and data services, but an increase of some examples, such as : the progress of the band Search tools, SQL syntax analysis, data window cache services.)