Source code for PyMca5.PyMcaGui.misc.SubprocessLogWidget

#/*##########################################################################
# Copyright (C) 2004-2014 V.A. Sole, European Synchrotron Radiation Facility
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# This file is part of the PyMca X-ray Fluorescence Toolkit developed at
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__author__ = "V.A. Sole - ESRF Data Analysis"
__contact__ = "sole@esrf.fr"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
import sys
import os
import subprocess
import time
from PyMca5.PyMcaGui import PyMcaQt as qt

[docs]class SubprocessLogWidget(qt.QWidget): sigSubprocessLogWidgetSignal = qt.pyqtSignal(object) def __init__(self, parent=None, args=None): qt.QWidget.__init__(self, parent) self.setWindowTitle("Subprocess Log Widget") self.mainLayout = qt.QVBoxLayout(self) self._p = None self.__timer = qt.QTimer() self._args = args self.__timer.timeout.connect(self._timerSlot) self.logWidget = qt.QTextEdit(self) self.logWidget.setReadOnly(True) self.mainLayout.addWidget(self.logWidget)
[docs] def setSubprocessArgs(self, args): self._args = args
[docs] def start(self, args=None, timing=0.1): if args is None: if self._args is None: raise ValueError("Subprocess command not defined") else: self._args = args else: self._args = args self._startTimer(timing=timing)
[docs] def stop(self): if self.isSubprocessRunning(): #print("MESSAGE TO KILL PROCESS") #print("HOW TO KILL IT IN A GOOD WAY?") self._p.kill()
[docs] def isSubprocessRunning(self): running = False if self._p is not None: if self._p.poll() is None: running = True return running
def _startTimer(self, timing=0.1): if self._args is None: raise ValueError("Subprocess command not defined") self._p = subprocess.Popen(self._args, bufsize=0, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True) ddict = {} ddict["subprocess"] = self._p ddict["event"] = "ProcessStarted" self.sigSubprocessLogWidgetSignal.emit(ddict) self.__timer.start(timing) def _timerSlot(self): ddict = {} ddict["subprocess"] = self._p if self._p.poll() is None: # process did not finish yet line = self._p.stdout.readline() if len(line) > 1: self.logWidget.append(line[:-1]) qApp = qt.QApplication.instance() qApp.processEvents() ddict["event"] = "ProcessRunning" else: self.__timer.stop() returnCode = self._p.returncode ddict['event'] = "ProcessFinished" ddict['code'] = returnCode ddict["message"] = [] if returnCode == 0: line = self._p.stdout.readline() while len(line) > 1: self.logWidget.append(line[:-1]) line = self._p.stdout.readline() else: line = self._p.stderr.readline() while len(line) > 1: ddict["message"].append(line) self.logWidget.append(line[:-1]) line = self._p.stderr.readline() self._p = None self.sigSubprocessLogWidgetSignal.emit(ddict)
[docs] def clear(self): self.logWidget.clear()
[docs] def append(self, text): self.logWidget.append(text)
[docs] def closeEvent(self, event): if self._p is not None: try: self.stop() except: # this may happen if the process finished in the mean time pass qt.QWidget.closeEvent(self, event)