python实例26[将log同时写入文件和显示到UI的控件中]

特点：

1） 此GlobalLogging 采用了singlten模式，全局唯一，必须通过getInstance方法来获得GlobalLogging的实例；

2） 此GlobalLogging可以采用logging提供的log handlers（例如log到console，file。。。），同时支持提供自定义函数来处理log的接口，可以自己定义如何处理log；

GlobalLogging的使用如下： (将系统的所有的函数的log，同时写到log文件和UI中的text控件中)

from GlobalLogging import GlobalLogging

class A:
  def __init__(self):
    GlobalLogging.getInstance().setLoggingToHanlder(self.getLog)
    GlobalLogging.getInstance().setLoggingToFile('logfile.txt')
    GlobalLogging.getInstance().setLoggingLevel(logging.INFO)

  def getLog(self, s):
    self.outputText.append(s)

  def FA(self):    
    GlobalLogging.getInstance().info('XXX')
    GlobalLogging.getInstance().error('XXX')

 

GlobalLogging代码：

import logging

class NullHandler(logging.Handler):
  def emit(self, record): pass

class GlobalLogging:

  log = None
  
  @staticmethod
  def getInstance():
    if GlobalLogging.log == None: 
      GlobalLogging.log = GlobalLogging()
    return GlobalLogging.log 

  def __init__(self):
    self.logger = None
    self.handler = None
    self.level = logging.INFO
    self.logger = logging.getLogger("GlobalLogging")
    self.formatter = logging.Formatter("%(levelname)s - %(message)s")
    h = NullHandler()
    self.logger.addHandler(h)

def setLoggingToFile(self,file):     
fh = logging.FileHandler(file)
      fh.setFormatter(self.formatter)
      self.logger.addHandler(ch)
      
  def setLoggingToConsole(self) : 
      ch = logging.StreamHandler()
      ch.setFormatter(self.formatter)
      self.logger.addHandler(fh)
      
  def setLoggingToHanlder(self,handler): 
      self.handler = handler
      
  def setLoggingLevel(self,level):
    self.level = level
    self.logger.setLevel(level)
    
  def debug(self,s):
      self.logger.debug(s)
      if not self.handler == None and self.level <= logging.DEBUG :
        print logging.DEBUG
        print self.level
        self.handler('debug:' + s)
  def info(self,s):
      self.logger.info(s)
      if not self.handler == None and self.level <= logging.INFO:
        self.handler('info:' + s)
  def warn(self,s):
      self.logger.warn(s)
      if not self.handler == None and self.level <= logging.WARNING:
        self.handler('warn:' + s)
  def error(self,s):
      self.logger.error(s)
      if not self.handler == None and self.level <= logging.ERROR:
        self.handler('error:' + s)
  def critical(self,s):
      self.logger.critical(s)
      if not self.handler == None and self.level <= logging.CRITICAL:
        self.handler('critical:' + s)

完！