在
QHandler该样本是不是线程安全的，所以如果你从另一个线程调用它，它就会产生问题，因为它是一个GUI，一个可能的解决方案是从辅助线程发送数据（
defemit(self, record):通过）到GUI的线程
QmetaObject你为这个必须使用
pyqtSlot：
class QHandler(logging.Handler, QtWidgets.QTextEdit): def __init__(self, parent=None): QtWidgets.QTextEdit.__init__(self, parent) logging.Handler.__init__(self) self.setLineWrapMode(QtWidgets.QTextEdit.NoWrap) self.setReadonly(True) self.emit_lock = threading.Lock() def emit(self, record): with self.emit_lock: QtCore.QmetaObject.invokeMethod(self, "append", QtCore.Qt.QueuedConnection, QtCore.Q_ARG(str, self.format(record))) QtCore.QmetaObject.invokeMethod(self, "autoScroll", QtCore.Qt.QueuedConnection) def format(self, record): if record.levelno == logging.INFO: bgcolor = WHITE fgcolor = BLACK elif record.levelno == logging.WARNING: bgcolor = YELLOW fgcolor = BLACK elif record.levelno == logging.ERROR: bgcolor = ORANGE fgcolor = BLACK elif record.levelno == logging.CRITICAL: bgcolor = RED fgcolor = BLACK else: bgcolor = BLACK fgcolor = WHITE self.setTextBackgroundColor(bgcolor) self.setTextColor(fgcolor) self.setFont(DEFAULT_FONT) record = logging.Handler.format(self, record) return record @QtCore.pyqtSlot() def autoScroll(self): self.verticalScrollBar().setSliderPosition(self.verticalScrollBar().maximum())
例：
import randomimport loggingimport threadingfrom PyQt5 import QtCore, QtGui, QtWidgetsWHITE, BLACK, YELLOW, ORANGE, RED = QtGui.QColor("white"), QtGui.QColor("black"), QtGui.QColor("yellow"), QtGui.QColor("orange"), QtGui.QColor("red")DEFAULT_FONT = QtGui.QFont()class QHandler(logging.Handler, QtWidgets.QTextEdit): def __init__(self, parent=None): QtWidgets.QTextEdit.__init__(self, parent) logging.Handler.__init__(self) self.setLineWrapMode(QtWidgets.QTextEdit.NoWrap) self.setReadonly(True) self.emit_lock = threading.Lock() def emit(self, record): with self.emit_lock: QtCore.QmetaObject.invokeMethod(self, "append", QtCore.Qt.QueuedConnection, QtCore.Q_ARG(str, self.format(record))) QtCore.QmetaObject.invokeMethod(self, "autoScroll", QtCore.Qt.QueuedConnection) def format(self, record): if record.levelno == logging.INFO: bgcolor = WHITE fgcolor = BLACK elif record.levelno == logging.WARNING: bgcolor = YELLOW fgcolor = BLACK elif record.levelno == logging.ERROR: bgcolor = ORANGE fgcolor = BLACK elif record.levelno == logging.CRITICAL: bgcolor = RED fgcolor = BLACK else: bgcolor = BLACK fgcolor = WHITE self.setTextBackgroundColor(bgcolor) self.setTextColor(fgcolor) self.setFont(DEFAULT_FONT) record = logging.Handler.format(self, record) return record @QtCore.pyqtSlot() def autoScroll(self): self.verticalScrollBar().setSliderPosition(self.verticalScrollBar().maximum())class MainWindow(QtWidgets.QMainWindow): def __init__(self, parent=None): super(MainWindow, self).__init__(parent) self.status_handler = QHandler() self.setCentralWidget(self.status_handler) logging.getLogger().addHandler(self.status_handler) self.status_handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')) logging.getLogger().setLevel(logging.DEBUG) timer = QtCore.QTimer(self, interval=1000, timeout=self.on_timeout) timer.start() def on_timeout(self): logging.info('From Gui Thread {}'.format(QtCore.QDateTime.currentDateTime().toString()))class Subprocess_Thread(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.logger = logging.getLogger(self.__class__.__name__) self.logger.info('Subprocess Thread Created') def run(self): while True: t = random.choice(["info", "warning", "error", "critical"]) msg = "Type: {}, thread: {}".format(t, threading.currentThread()) getattr(self.logger, t)(msg) QtCore.QThread.sleep(1)if __name__ == '__main__': import sys app = QtWidgets.QApplication.instance() if app is None: app = QtWidgets.QApplication(sys.argv) app.setStyle('Fusion') w = MainWindow() w.show() th = Subprocess_Thread() th.daemon = True th.start() sys.exit(app.exec_())
