调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。-Certain procedures when debugging the need for a lightweight for the log file records, here are given a category of easy-to-use CLog to complete this feature. In compiling the release version of the application, the log file automatically invalid.