试某些程序的时候需要一个轻量级的日志文件作记录，这里给出一个简单易用的CLog类来完成此项功能。在编译应用程序的release版时，日志文件功能自动无效。-Try some of the procedures when the need for a lightweight log file for the record, here given an easy-to-use category Clog to complete this feature. Application at compile