我正在使用python编写一个应用程序,它将处理一个txt文件。用户从硬盘驱动器中选择一个文件,程序将打开并处理它。我遇到的主要问题是,你第一次运行它,它很好;但如果你多次运行它而不重新启动程序,每次在第一次运行后将花费相同的时间,但进度条滞后,有时文件选择对话框不会消失,直到处理完成。这是下面的代码。我知道缩进是错误的,它不会正确复制。任何人都可以看到第一次运行后可能导致滞后的部分吗?
import sys, time, os
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_MainWindow(QtGui.QMainWindow):
def updateProgress(self):
self.progressBar.setValue(self.progressBar.value()+1)
self.progressBar.repaint()
def processCollect(self):
filename = None
self.progressBar.setValue(0)
#Get the filename from user
try:
filename = QtGui.QFileDialog.getOpenFileName(self, "Open Collect", sys.path[1] + "/", "Text files (*.txt)")
except IOError:
filename == None
if filename:
#Find number of lines
file = open(filename, "r")
linecount = 0
for line in file:
linecount = linecount+1
file.close()
print(linecount)
#Set up progress bar
self.progressBar.setMinimum(0)
self.progressBar.setMaximum(linecount)
self.progressBar.show()
#Read file contents and update progress bar
file = open(filename, "r")
for line in file:
line = line.replace("\n", "")
print(line)
time.sleep(.05)
self.updateProgress()
file.close()
def setupUi(self, MainWindow):
#Create the main window
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(800, 600)
#Body of the main window
self.centralwidget = QtGui.QWidget(MainWindow)
#Add process collect button
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.centralwidget.buttonProcessCollect = QtGui.QPushButton(self.centralwidget)
self.centralwidget.buttonProcessCollect.setGeometry(QtCore.QRect(310, 240, 120, 40))
self.centralwidget.buttonProcessCollect.setObjectName(_fromUtf8("buttonProcessCollect"))
#Add progress bar
self.progressBar = QtGui.QProgressBar(self.centralwidget)
self.progressBar.setGeometry(QtCore.QRect(165, 290, 430, 20))
self.progressBar.setProperty("value", 0)
self.progressBar.setObjectName("progressBar")
self.progressBar.hide()
#Add actions to body
self.centralwidget.connect(self.centralwidget.buttonProcessCollect, SIGNAL("clicked()"), self.processCollect)
#Add body to the menu
MainWindow.setCentralWidget(self.centralwidget)
#Add text
self.retranslateUi(MainWindow)
#Connect actions
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
self.centralwidget.buttonProcessCollect.setText(QtGui.QApplication.translate("MainWindow", "Process Collect", None, QtGui.QApplication.UnicodeUTF8))
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
答案 0 :(得分:2)
这可以通过使用线程进行解析,以便不影响实际的用户界面。
您可以使用python线程模块或qt qthread模块。
Twio链接到该主题:
stackoverflow question asked earlier slightly diffrent
这是一个使用pyqt进行线程化的教程: threading pyqt4