How can I redirect the logger to a wxPython textCtrl using a custom logging handler?

Question

I'm using a module in my python app that writes a lot a of messages using the logging module. Initially I was using this in a console application and it was pretty easy to get the logging output to display on the console using a console handler. Now I've developed a GUI version of my app using wxPython and I'd like to display all the logging output to a custom control — a multi-line textCtrl. Is there a way i could create a custom logging handler so i can redirect all the logging output there and display the logging messages wherever/however I want — in this case, a wxPython app.

Answer 1

Create Handler

import wx
import wx.lib.newevent

import logging

# create event type
wxLogEvent, EVT_WX_LOG_EVENT = wx.lib.newevent.NewEvent()


class wxLogHandler(logging.Handler):
    """
    A handler class which sends log strings to a wx object
    """
    def __init__(self, wxDest=None):
        """
        Initialize the handler
        @param wxDest: the destination object to post the event to 
        @type wxDest: wx.Window
        """
        logging.Handler.__init__(self)
        self.wxDest = wxDest
        self.level = logging.DEBUG

    def flush(self):
        """
        does nothing for this handler
        """


    def emit(self, record):
        """
        Emit a record.

        """
        try:
            msg = self.format(record)
            evt = wxLogEvent(message=msg,levelname=record.levelname)            
            wx.PostEvent(self.wxDest,evt)
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            self.handleError(record)

Then in your control

self.Bind(EVT_WX_LOG_EVENT, self.onLogEvent)

def onLogEvent(self,event):
    '''
    Add event.message to text window
    '''
    msg = event.message.strip("\r")+"\n"
    self.logwindow.AppendText(msg) # or whatevery
    event.Skip()