Python 从另一个运行FTP下载的线程更新PyQt进度
我想从另一个类/线程(Python 从另一个运行FTP下载的线程更新PyQt进度,python,ftp,pyqt,progress-bar,ftplib,Python,Ftp,Pyqt,Progress Bar,Ftplib,我想从另一个类/线程(DownloadThread()class)访问进度条(在Ui\u主窗口()class中) 我试图使DownloadThread()类继承自Ui\u主窗口: 下载线程(Ui\u主窗口)。但当我尝试设置最大进度条值时: Ui_MainWindow.progressBar.setMaximum(100) 我得到这个错误: AttributeError:类型对象“Ui\u MainWindow”没有属性“progressBar” 我的代码: class Ui_MainWindo
DownloadThread()
class)访问进度条(在Ui\u主窗口()
class中)
我试图使DownloadThread()
类继承自Ui\u主窗口
:
下载线程(Ui\u主窗口)
。但当我尝试设置最大进度条值时:
Ui_MainWindow.progressBar.setMaximum(100)
我得到这个错误:
AttributeError:类型对象“Ui\u 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))
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))
您还可以发出带有信号的字符串和数字。直接的问题是,
Ui\u MainWindow
是一个类,而不是该类的实例。您必须将“窗口”self
传递给下载线程
。但无论如何,这不是正确的解决方案。您无法从其他线程访问PyQt小部件。相反,请使用与之前相同的技术来更新状态文本()
对代码的其他更改:
是一种不好的做法。改用全局本地文件
李>self.localfile
- 不需要
,localfile.close()
和
一起处理这个问题李>
- 类似地,
应替换为ftp.quit()
with
- 无需从
继承Ui\u主窗口
DownloadThread
- 类似地,
全局本地文件
是一种不好的做法。改用self.localfile
。+无需使用self.localfile.close()
,with
会解决这个问题无需从Ui\u主窗口继承DownloadThread
——我在回答中也纠正了这一点。
class Ui_MainWindow(object):
def download_file(self):
self.thread = DownloadThread()
self.thread.data_downloaded.connect(self.on_data_ready)
self.thread.data_progress.connect(self.on_progress_ready)
self.progress_initialized = False
self.thread.start()
def on_progress_ready(self, data):
# The first signal sets the maximum, the other signals increase a progress
if self.progress_initialized:
self.progressBar.setValue(self.progressBar.value() + int(data))
else:
self.progressBar.setMaximum(int(data))
self.progress_initialized = True
class DownloadThread(QtCore.QThread):
data_downloaded = QtCore.pyqtSignal(object)
data_progress = QtCore.pyqtSignal(object)
def run(self):
self.data_downloaded.emit('Status: Connecting...')
with FTP('example.com') as ftp:
ftp.login(user='user', passwd='pass')
ftp.cwd('/some_directory/')
filename = '100MB.bin'
totalsize = ftp.size(filename)
print(totalsize)
# The first signal sets the maximum
self.data_progress.emit(str(totalsize))
self.data_downloaded.emit('Status: Downloading...')
with open(filename, 'wb') as self.localfile:
ftp.retrbinary('RETR ' + filename, self.file_write)
self.data_downloaded.emit('Status: Updated!')
def file_write(self, data):
self.localfile.write(data)
# The other signals increase a progress
self.data_progress.emit(str(len(data)))