我正在开发一个程序来解析一个文件（365000 行），我在读取每一行后尝试匹配一些关键字。此计算以及 my 的更新QProgressBar是在另一个线程中使用QThread. 一切正常，除了性能，尤其是当我更新QProgressBar. 我使用计时器进行解析，结果令人惊叹。当我发出更新信号时，QProgressBar程序大约需要 45 秒，但是当我不发出QProgressBar更新信号时，程序大约需要 0.40 秒 =/
from PyQt5 import QtCore, QtWidgets, QtGui
import sys
import time
liste = ["failed", "exception"]
class ParseFileAsync(QtCore.QThread):
match = QtCore.pyqtSignal(str)
PBupdate = QtCore.pyqtSignal(int)
PBMax = QtCore.pyqtSignal(int)
def run(self):
cpt = 0
with open("test.txt", "r") as fichier:
fileLines = fichier.readlines()
lineNumber = len(fileLines)
self.PBMax.emit(lineNumber)
t0 = time.time()
for line in fileLines:
cpt+=1
self.PBupdate.emit(cpt)
for element in liste:
if element in line:
self.match.emit(line)
finalTime = time.time() - t0
print("over :", finalTime)
class Ui_MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.setupUi(self)
self.thread = ParseFileAsync()
self.thread.match.connect(self.printError)
self.thread.PBupdate.connect(self.updateProgressBar)
self.thread.PBMax.connect(self.setMaximumProgressBar)
self.pushButton_GO.clicked.connect(self.startThread)
def printError(self, line):
self.textEdit.append(line)
def updateProgressBar(self, value):
self.progressBar.setValue(value)
def setMaximumProgressBar(self, value):
self.progressBar.setMaximum(value)
def startThread(self):
self.thread.start()
控制台输出：
over : 44.49321101765038 //QProgressBar updated
over : 0.3695987798147516 //QProgressBar not updated
我错过了什么还是预期的？
编辑 ：
我遵循 jpo38 和 Matteo 非常好的建议。我不太频繁地更新 QProgressBar。进展仍然很顺利，性能非常好（这个实现大约需要一秒钟）。邮政总局：
class ParseFileAsync(QtCore.QThread):
match = QtCore.pyqtSignal(str)
PBupdate = QtCore.pyqtSignal(int)
PBMax = QtCore.pyqtSignal(int)
def run(self):
with open("test_long.log", "r") as fichier:
fileLines = fichier.readlines()
self.lineNumber = len(fileLines)
self.PBMax.emit(self.lineNumber)
if (self.lineNumber < 30):
self.parseFile(fileLines, False)
else:
self.parseFile(fileLines, True)
def parseFile(self, fileLines, isBig):
cpt = 0
if(isBig):
for line in fileLines:
cpt+=1
if(cpt % (int(self.lineNumber/30)) == 0):
self.PBupdate.emit(cpt)
for element in liste:
if element in line:
self.match.emit(line)
self.PBupdate.emit(self.lineNumber) #To avoid QProgressBar stopping at 99%
else:
for line in fileLines:
cpt+=1
self.PBupdate.emit(cpt)
for element in liste:
if element in line:
self.match.emit(line)