Poco::Logger不记录跟踪或调试级别日志,仅记录信息级别及以上

我在尝试启用poco_trace和poco_debug日志记录时遇到问题。我使用Logger::setLevel()设置PRIO_TRACE的级别,但我仍然没有看到任何优先级低于PRIO_INFORATION的内容写入日志。这是相关代码。

//  ... In the constructor  of my main class
//  All Loggers in the program inherit from the Logger found here.

getLogger().setChannel( channel );
getLogger().setLevel( Poco::Message::PRIO_TRACE );

//  This prints "Level is 8" to the log, 8 being Message::PRIO_TRACE.
poco_information_f1( getLogger(), "Level is %i", getLogger().getLevel() );
//  This however is not printed to the log.
poco_trace( getLogger(), "Trace logging is enabled" );

//  ...

//  Definition of getLogger()
inline Poco::Logger& Application::getLogger() const
{   
    //  Where logger is a class member of type Poco::Logger*
    poco_check_ptr( logger );
    return *logger;
}

据我看Poco文档所知,这已经足够了。我是否遗漏了一个步骤,或者这个设置本身有什么问题?