log4cpp_log4cpp全局对象_log4cpp grtinstance(5)

log4cpp::Priority::PriorityLevel priority;

bool this_is_critical = true;

if(this_is_critical)

priority = log4cpp::Priority::CRIT;

else

priority = log4cpp::Priority::DEBUG;

warn_log.log(priority,"Importance depends on context");

warn_log.critStream()

screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onmousewheel="return imgzoom(this);" alt="" />

screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onmousewheel="return imgzoom(this);" alt="" />

screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onmousewheel="return imgzoom(this);" alt="" />

screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onmousewheel="return imgzoom(this);" alt="" />

3. 配置文件驱动方式使用步骤

另一个非常优秀的特征就是通过读取配置文件，确定category、appender、layout等对象。也是我们非常推荐的使用方式，可以灵活地通过配置文件定义所有地对象及其属性，不用重新编码，动态更改日志记录的策略。

Log4cpp主要提供了 log4cpp::PropertyConfigurator 和log4cpp::SimpleConfigurator两种机制（文件格式），但 log4cpp::SimpleConfigurator将来不再支持了，而且格式非常简单，这里就不多说明，自己看源码吧。

配置文件的格式和log4j的配置文件一样，是标准的java属性文件格式。下面是附带的例子配置文件：

# a test config

#定义了3个category sub1, sub2, sub1.sub2

log4j.rootCategory=DEBUG, rootAppender

log4j.category.sub1=,A1

log4j.category.sub2=INFO

log4j.category.sub1.sub2=ERROR, A2

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