我想访问进度条的(这是在Ui_MainWindow()类)setMaximum()从另一个类/线程(DownloadThread()类)。
Ui_MainWindow()
setMaximum()
DownloadThread()
我尝试使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
DownloadThread(Ui_MainWindow)
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))
直接的问题是那Ui_MainWindow是一个类,而不是该类的实例。您必须将“窗口”self传递给DownloadThread。但这毕竟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,请使用与您已经使用的相同的技术来更新状态文本( 带有文本标签的FTP下载,其中显示了下载的当前状态 )。
self
DownloadThread
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)))
您的代码的其他更改:
global localfile
self.localfile
localfile.close()
with
ftp.quit()