将不同文件的日志记录重定向到 QPlainTextEdit
Redirecting Logging of a Different File to QPlainTextEdit
我的 PyQt5 应用程序是一个 GUI，它在 QProcess 中运行 python 脚本，another_module.py。 another_module.py 具有写入 stdout 的日志记录机制。我希望能够连接 another_module.py 中的日志并将其重定向到 GUI 中的文本框，这样无论日志 another_module.py 生成什么，都可以 printed/appended 到我的 GUI 中的文本框。我的代码在下面。
my_gui.py
import sys
from PyQt5 import QtWidgets
from PyQt5.QtCore import QProcess
import logging
import another_module # This file has a sample logging mechanism which I would like to have access in my_gui.py
logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(name)s - %(levelname)s - %(message)s')
class QTextEditLogger(logging.Handler):
def __init__(self, parent):
super().__init__()
self.widget = QtWidgets.QPlainTextEdit(parent)
self.widget.setReadOnly(True)
def emit(self, record):
msg = self.format(record)
self.widget.appendPlainText(msg)
class MyDialog(QtWidgets.QDialog, QtWidgets.QPlainTextEdit):
def __init__(self, parent=None):
super().__init__(parent)
# Setup logging here:
logTextBox = QTextEditLogger(self)
logTextBox.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
logging.getLogger().addHandler(logTextBox) # root logging nicely redirects to logTextBox
logging.getLogger().setLevel(logging.DEBUG)
another_module.logger.addHandler(logTextBox) # logging of the other file is not redirected to logTextBox
another_module.logger.setLevel(logging.DEBUG)
self.process = None
self._button = QtWidgets.QPushButton(self)
self._button.setText('Start')
layout = QtWidgets.QVBoxLayout()
layout.addWidget(logTextBox.widget)
layout.addWidget(self._button)
self.setLayout(layout)
self._button.clicked.connect(self.test)
def test(self):
logging.debug('damn, a bug')
logging.info('something to remember')
logging.warning('that\'s not right')
logging.error('foobar')
self.process = QProcess(self)
self.process.started.connect(lambda: print('Started!'))
self.process.finished.connect(lambda: print('Finished!'))
self.process.startDetached('python another_module.py')
app = QtWidgets.QApplication(sys.argv)
dlg = MyDialog()
dlg.show()
dlg.raise_()
sys.exit(app.exec_())
another_module.py
import logging
import sys
import time
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s:%(name)s:%(funcName)s:%(lineno)d:%(message)s')
file_handler = logging.FileHandler('another_module.log')
file_handler.setLevel(logging.INFO)
file_handler.setFormatter(formatter)
stream_handler = logging.StreamHandler(sys.stdout)
stream_handler.setFormatter(formatter)
logger.addHandler(file_handler)
logger.addHandler(stream_handler)
def create_some_log():
while True:
logger.debug('<<different file>> damn, a bug')
logger.info('<<different file>> something to remember')
logger.warning('<<different file>> that\'s not right')
logger.error('<<different file>> foobar')
time.sleep(5)
if __name__ == '__main__':
create_some_log()
如何将 another_module.py 中的日志输出重定向到 my_gui.py 中的文本框？
我上面的代码运行没有问题，控制台打印了以下信息：
2020-10-04 22:39:23,975 - root - DEBUG - damn, a bug
2020-10-04 22:39:23,976 - root - INFO - something to remember
2020-10-04 22:39:23,976 - root - WARNING - that's not right
2020-10-04 22:39:23,976 - root - ERROR - foobar
2020-10-04 22:49:27,457:__main__:create_some_log:22:<<different file>> something to remember
2020-10-04 22:49:27,457:__main__:create_some_log:23:<<different file>> that's not right
2020-10-04 22:49:27,457:__main__:create_some_log:24:<<different file>> foobar
但是，在gui中只有root日志打印到文本框：
2020-10-04 22:39:23,975 - root - DEBUG - damn, a bug
2020-10-04 22:39:23,976 - root - INFO - something to remember
2020-10-04 22:39:23,976 - root - WARNING - that's not right
2020-10-04 22:39:23,976 - root - ERROR - foobar
如果您要 运行 使用 QProcess 的脚本，那么它将 运行 在不同的进程中，因此执行 another_module.logger.addHandler(logTextBox) 和 another_module.logger.setLevel(logging.DEBUG) 不会修改任何内容或使感觉。本例中的想法是使用 readAllStandardOutput() 方法获取日志：
import logging
import os
import sys
from PyQt5 import QtCore, QtWidgets
CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))
logging.basicConfig(
level=logging.DEBUG, format=" %(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
class QTextEditLogger(logging.Handler):
def __init__(self, parent):
super().__init__()
self.widget = QtWidgets.QPlainTextEdit(parent)
self.widget.setReadOnly(True)
def emit(self, record):
msg = self.format(record)
self.widget.appendPlainText(msg)
class MyDialog(QtWidgets.QDialog):
def __init__(self, parent=None):
super().__init__(parent)
# Setup logging here:
self.logTextBox = QTextEditLogger(self)
self.logTextBox.setFormatter(
logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
)
logging.getLogger().addHandler(self.logTextBox)
logging.getLogger().setLevel(logging.DEBUG)
self._button = QtWidgets.QPushButton()
self._button.setText("Start")
layout = QtWidgets.QVBoxLayout(self)
layout.addWidget(self.logTextBox.widget)
layout.addWidget(self._button)
self._button.clicked.connect(self.test)
self.process = QtCore.QProcess()
self.process.readyReadStandardOutput.connect(
self.handle_readyReadStandardOutput
)
self.process.started.connect(lambda: print("Started!"))
self.process.finished.connect(lambda: print("Finished!"))
def test(self):
logging.debug("damn, a bug")
logging.info("something to remember")
logging.warning("that's not right")
logging.error("foobar")
script = os.path.join(CURRENT_DIR, "another_module.py")
self.process.start(sys.executable, [script])
def handle_readyReadStandardOutput(self):
text = self.process.readAllStandardOutput().data().decode()
self.logTextBox.widget.appendPlainText(text.strip())
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
dlg = MyDialog()
dlg.show()
dlg.raise_()
sys.exit(app.exec_())
我的 PyQt5 应用程序是一个 GUI，它在 QProcess 中运行 python 脚本，another_module.py。 another_module.py 具有写入 stdout 的日志记录机制。我希望能够连接 another_module.py 中的日志并将其重定向到 GUI 中的文本框，这样无论日志 another_module.py 生成什么，都可以 printed/appended 到我的 GUI 中的文本框。我的代码在下面。
my_gui.py
import sys
from PyQt5 import QtWidgets
from PyQt5.QtCore import QProcess
import logging
import another_module # This file has a sample logging mechanism which I would like to have access in my_gui.py
logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(name)s - %(levelname)s - %(message)s')
class QTextEditLogger(logging.Handler):
def __init__(self, parent):
super().__init__()
self.widget = QtWidgets.QPlainTextEdit(parent)
self.widget.setReadOnly(True)
def emit(self, record):
msg = self.format(record)
self.widget.appendPlainText(msg)
class MyDialog(QtWidgets.QDialog, QtWidgets.QPlainTextEdit):
def __init__(self, parent=None):
super().__init__(parent)
# Setup logging here:
logTextBox = QTextEditLogger(self)
logTextBox.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
logging.getLogger().addHandler(logTextBox) # root logging nicely redirects to logTextBox
logging.getLogger().setLevel(logging.DEBUG)
another_module.logger.addHandler(logTextBox) # logging of the other file is not redirected to logTextBox
another_module.logger.setLevel(logging.DEBUG)
self.process = None
self._button = QtWidgets.QPushButton(self)
self._button.setText('Start')
layout = QtWidgets.QVBoxLayout()
layout.addWidget(logTextBox.widget)
layout.addWidget(self._button)
self.setLayout(layout)
self._button.clicked.connect(self.test)
def test(self):
logging.debug('damn, a bug')
logging.info('something to remember')
logging.warning('that\'s not right')
logging.error('foobar')
self.process = QProcess(self)
self.process.started.connect(lambda: print('Started!'))
self.process.finished.connect(lambda: print('Finished!'))
self.process.startDetached('python another_module.py')
app = QtWidgets.QApplication(sys.argv)
dlg = MyDialog()
dlg.show()
dlg.raise_()
sys.exit(app.exec_())
another_module.py
import logging
import sys
import time
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s:%(name)s:%(funcName)s:%(lineno)d:%(message)s')
file_handler = logging.FileHandler('another_module.log')
file_handler.setLevel(logging.INFO)
file_handler.setFormatter(formatter)
stream_handler = logging.StreamHandler(sys.stdout)
stream_handler.setFormatter(formatter)
logger.addHandler(file_handler)
logger.addHandler(stream_handler)
def create_some_log():
while True:
logger.debug('<<different file>> damn, a bug')
logger.info('<<different file>> something to remember')
logger.warning('<<different file>> that\'s not right')
logger.error('<<different file>> foobar')
time.sleep(5)
if __name__ == '__main__':
create_some_log()
如何将 another_module.py 中的日志输出重定向到 my_gui.py 中的文本框？
我上面的代码运行没有问题，控制台打印了以下信息：
2020-10-04 22:39:23,975 - root - DEBUG - damn, a bug
2020-10-04 22:39:23,976 - root - INFO - something to remember
2020-10-04 22:39:23,976 - root - WARNING - that's not right
2020-10-04 22:39:23,976 - root - ERROR - foobar
2020-10-04 22:49:27,457:__main__:create_some_log:22:<<different file>> something to remember
2020-10-04 22:49:27,457:__main__:create_some_log:23:<<different file>> that's not right
2020-10-04 22:49:27,457:__main__:create_some_log:24:<<different file>> foobar
但是，在gui中只有root日志打印到文本框：
2020-10-04 22:39:23,975 - root - DEBUG - damn, a bug
2020-10-04 22:39:23,976 - root - INFO - something to remember
2020-10-04 22:39:23,976 - root - WARNING - that's not right
2020-10-04 22:39:23,976 - root - ERROR - foobar
如果您要 运行 使用 QProcess 的脚本，那么它将 运行 在不同的进程中，因此执行 another_module.logger.addHandler(logTextBox) 和 another_module.logger.setLevel(logging.DEBUG) 不会修改任何内容或使感觉。本例中的想法是使用 readAllStandardOutput() 方法获取日志：
import logging
import os
import sys
from PyQt5 import QtCore, QtWidgets
CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))
logging.basicConfig(
level=logging.DEBUG, format=" %(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
class QTextEditLogger(logging.Handler):
def __init__(self, parent):
super().__init__()
self.widget = QtWidgets.QPlainTextEdit(parent)
self.widget.setReadOnly(True)
def emit(self, record):
msg = self.format(record)
self.widget.appendPlainText(msg)
class MyDialog(QtWidgets.QDialog):
def __init__(self, parent=None):
super().__init__(parent)
# Setup logging here:
self.logTextBox = QTextEditLogger(self)
self.logTextBox.setFormatter(
logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
)
logging.getLogger().addHandler(self.logTextBox)
logging.getLogger().setLevel(logging.DEBUG)
self._button = QtWidgets.QPushButton()
self._button.setText("Start")
layout = QtWidgets.QVBoxLayout(self)
layout.addWidget(self.logTextBox.widget)
layout.addWidget(self._button)
self._button.clicked.connect(self.test)
self.process = QtCore.QProcess()
self.process.readyReadStandardOutput.connect(
self.handle_readyReadStandardOutput
)
self.process.started.connect(lambda: print("Started!"))
self.process.finished.connect(lambda: print("Finished!"))
def test(self):
logging.debug("damn, a bug")
logging.info("something to remember")
logging.warning("that's not right")
logging.error("foobar")
script = os.path.join(CURRENT_DIR, "another_module.py")
self.process.start(sys.executable, [script])
def handle_readyReadStandardOutput(self):
text = self.process.readAllStandardOutput().data().decode()
self.logTextBox.widget.appendPlainText(text.strip())
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
dlg = MyDialog()
dlg.show()
dlg.raise_()
sys.exit(app.exec_())