python - 从另一个运行 FTP 下载的线程更新 PyQt 进度
问题描述
我想从另一个类/线程(类)访问进度条(在Ui_MainWindow()
类中)。setMaximum()
DownloadThread()
我尝试让DownloadThread()
类继承自Ui_MainWindow
:
DownloadThread(Ui_MainWindow)
。但是当我尝试设置最大进度条值时:
Ui_MainWindow.progressBar.setMaximum(100)
我收到此错误:
AttributeError:类型对象“Ui_MainWindow”没有属性“progressBar”
我的代码:
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
# ...
self.updateButton = QtGui.QPushButton(self.centralwidget)
self.progressBar = QtGui.QProgressBar(self.centralwidget)
self.updateStatusText = QtGui.QLabel(self.centralwidget)
# ...
self.updateButton.clicked.connect(self.download_file)
# ...
def download_file(self):
self.thread = DownloadThread()
self.thread.data_downloaded.connect(self.on_data_ready)
self.thread.start()
def on_data_ready(self, data):
self.updateStatusText.setText(str(data))
class DownloadThread(QtCore.QThread, Ui_MainWindow):
data_downloaded = QtCore.pyqtSignal(object)
def run(self):
self.data_downloaded.emit('Status: Connecting...')
ftp = FTP('example.com')
ftp.login(user='user', passwd='pass')
ftp.cwd('/some_directory/')
filename = '100MB.bin'
totalsize = ftp.size(filename)
print(totalsize)
# SET THE MAXIMUM VALUE OF THE PROGRESS BAR
Ui_MainWindow.progressBar.setMaximum(totalsize)
self.data_downloaded.emit('Status: Downloading...')
global localfile
with open(filename, 'wb') as localfile:
ftp.retrbinary('RETR ' + filename, self.file_write)
ftp.quit()
localfile.close()
self.data_downloaded.emit('Status: Updated!')
def file_write(self, data):
global localfile
localfile.write(data)
print(len(data))
解决方案
线程类:
from PyQt5 import QtCore, QtGui, QtWidgets, QtPrintSupport,QtWebEngineWidgets
from PyQt5.QtWidgets import QDialog,QWidget,QApplication, QInputDialog, QLineEdit, QFileDialog,QProgressDialog, QMainWindow, QFrame,QSplashScreen
from PyQt5.QtCore import QThread , pyqtSignal,Qt
from PyQt5.QtGui import QIcon,QPainter,QPixmap
class threaded_class(QThread):
signal_to_send_at_progress_bar = pyqtSignal()
def __init__(self,parent=None):
QThread.__init__(self, parent=parent)
def run(self):
while self.isRunning:
##do the stuf you want here and when you want to change the progress bar
self.signal_to_send_at_progress_bar.emit()
在您的主窗口中:
class mainProgram(QtWidgets.QMainWindow, Ui_MainWindow): #main window
def __init__(self, parent=None):
super(mainProgram, self).__init__(parent)
self.setupUi(self)
###...........#####
self.thread_class_in_main_window = threaded_class()
self.thread_class_in_main_window .start()
self.thread_db.signal_to_send_at_progress_bar.connect(progressBar.setMaximum(100))
您还可以使用信号发出字符串和数字。
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