Python 如何在进行Popen调用时保持gui的响应性?
我试图在调用Popen命令时播放一个throbber(以动画追逐箭头gif的形式),但它不起作用,因为我认为在Popen命令运行时gui完全没有响应。我怎样才能解决这个问题? 请检查我下面的代码Python 如何在进行Popen调用时保持gui的响应性?,python,python-2.7,pyqt,pyqt4,Python,Python 2.7,Pyqt,Pyqt4,我试图在调用Popen命令时播放一个throbber(以动画追逐箭头gif的形式),但它不起作用,因为我认为在Popen命令运行时gui完全没有响应。我怎样才能解决这个问题? 请检查我下面的代码 import subprocess import os import sys from PyQt4 import QtCore, QtGui class Test(QtGui.QDialog): def __init__(self, parent=None): super(T
import subprocess
import os
import sys
from PyQt4 import QtCore, QtGui
class Test(QtGui.QDialog):
def __init__(self, parent=None):
super(Test, self).__init__(parent)
self.setMinimumSize(200, 200)
self.buttonUpdate = QtGui.QPushButton()
self.buttonUpdate.setText("Get updates")
self.lbl1 = QtGui.QLabel()
self.lbl2 = QtGui.QLabel()
self.lblm2 = QtGui.QLabel()
gif = os.path.abspath("chassingarrows.gif")#throbber
self.movie = QtGui.QMovie(gif)
self.movie.setScaledSize(QtCore.QSize(20, 20))
self.pixmap = QtGui.QPixmap("checkmark.png")#green checkmark
self.pixmap2 = self.pixmap.scaled(20, 20)
verticalLayout = QtGui.QVBoxLayout(self)
h2 = QtGui.QHBoxLayout()
h2.addWidget(self.lblm2)
h2.addWidget(self.lbl2)
h2.setAlignment(QtCore.Qt.AlignCenter)
verticalLayout.addWidget(self.lbl1)
verticalLayout.addLayout(h2)
verticalLayout.addWidget(self.buttonUpdate, 0, QtCore.Qt.AlignRight)
self.buttonUpdate.clicked.connect(self.get_updates)
def get_updates(self):
try:
self.lbl1.setText("Updating")
self.lblm2.setMovie(self.movie)
self.movie.start()
self.setCursor(QtCore.Qt.BusyCursor)
p1 = subprocess.Popen(['apt', 'update'], stdout=subprocess.PIPE, bufsize=1)
p1.wait()
self.movie.stop()
self.lblm2.setPixmap(self.pixmap2)
self.unsetCursor()
self.lbl1.setText("Done update")
except subprocess.CalledProcessError, e:
print e.output
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
test = Test()
test.show()
sys.exit(app.exec_())
不要使用
subprocess.Popen
,而是在进程结束时使用允许回调的finished
信号:
def get_updates(self):
self.lbl1.setText("Updating")
self.lblm2.setMovie(self.movie)
self.movie.start()
self.setCursor(QtCore.Qt.BusyCursor)
self.p1 = QProcess()
self.p1.finished.connect(self.on_apt_update_finished)
self.p1.start('apt', ['update'])
def on_apt_update_finished(self, exit_code, exit_status):
self.movie.stop()
self.lblm2.setPixmap(self.pixmap2)
self.unsetCursor()
self.lbl1.setText("Done update")
精彩的回答!不知道为什么我不能对Popen执行同样的操作,但这是一个完美的选择。@answerSeeker,您可以使用
subprocess.Popen
,但它需要另一个线程来等待子进程完成,这很麻烦。