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List:       pykde
Subject:    [PyQt] logging.Handler not working with QThreads
From:       Lukas Hetzenecker <LuHe () gmx ! at>
Date:       2009-02-25 15:27:16
Message-ID: 200902251627.16827.LuHe () gmx ! at
[Download RAW message or body]

Hello,

I created a QTextEdit where I wanted to display log messages.
A logging.Handler should do this job.

It worked with one thread well, but when I start a QThread the text on all 
widgets is removed and I get many errors in my konsole:

X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0

.. and so on

I attatched a small example to this mail.

Could anybody tell me what I'm doing wrong?
Thanks for you help,
Lukas

["logging_error.py" (text/x-python)]

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import logging

class QtStreamHandler(logging.Handler):
    def __init__(self,  parent,  main):
        logging.Handler.__init__(self)
        self.parent = parent
        self.main = main
        
        self.textWidget = parent
        self.formater = logging.Formatter("%(message)s")
    
    def createLock(self):
        self.mutex = QMutex()
    
    def acquire(self):
        self.mutex.lock()
    
    def release(self):
        self.mutex.unlock()
    
    def emit(self,record):
        self.textWidget.appendPlainText(self.formater.format(record))
        self.textWidget.moveCursor(QTextCursor.StartOfLine)
        self.textWidget.ensureCursorVisible()

class Log(QDialog):
    def __init__(self, parent, main):
        super(Log,  self).__init__(parent)
        
        self.parent = parent
        self.main = main
        
        self.layout = QVBoxLayout(self)
        self.logEdit = QPlainTextEdit(self)
        self.logEdit.setLineWrapMode(QPlainTextEdit.NoWrap)
        self.logEdit.setReadOnly(True)
        self.button = QPushButton(self)
        self.button.setText("Message")
        self.layout.addWidget(self.logEdit)
        self.layout.addWidget(self.button)

        self.connect(self.button, SIGNAL("clicked()"), self.message)

        self.show()

    def message(self):
       self.main.log.error("Log window")

class MainWindow(QDialog):
   def __init__(self, parent, main):
      super(MainWindow, self).__init__()

      self.parent = parent
      self.main = main

      self.layout = QVBoxLayout(self)
      self.check = QCheckBox(self)
      self.check.setText("Foobar")
      self.combo = QComboBox(self)
      self.combo.addItem("aaaa")
      self.combo.addItem("bbbb")
      self.button = QPushButton(self)
      self.button.setText("Start Thread")
      self.button2 = QPushButton(self)
      self.button2.setText("Message")
      self.layout.addWidget(self.check)
      self.layout.addWidget(self.combo)
      self.layout.addWidget(self.button)
      self.layout.addWidget(self.button2)

      self.connect(self.button, SIGNAL("clicked()"), self.startThread)
      self.connect(self.button2, SIGNAL("clicked()"), self.message)

      self.show()

   def startThread(self):
      self.thread = Thread(self, self.main)
      self.connect(self.thread, SIGNAL("finished()"), lambda : self.main.log.error("Thread finished"))
      self.thread.start()

   def message(self):
      self.main.log.error("Main window")

class Thread(QThread):
   def __init__(self, parent, main):
      super(Thread, self).__init__(parent)
      self.log = main.log

   def run(self):
      self.log.info("Thread...")

class Main(QObject):
   def __init__(self):
      super(Main,  self).__init__()
      logger = logging.getLogger("series60-remote")
      logger.setLevel(logging.DEBUG)
      self.logWindow = Log(None,  self)
      dialogHandler = QtStreamHandler(self.logWindow.logEdit,  self)
      logger.addHandler(dialogHandler)
      self.logWindow.show()
      self.log = logger
      self.window = MainWindow(None, self)

app = QApplication([])
main = Main()
app.exec_()


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