FTP下载,带有文本标签,显示下载的当前状态 [英] FTP download with text label showing the current status of the download
问题描述
我制作了一个GUI,在其中单击下载"按钮后,程序将从FTP服务器下载文件.这样做时,我希望标签更新,例如:正在连接..."->正在下载..."->已下载!" 我尝试使用线程模块执行此操作,但似乎不起作用:
I made a GUI in which after I click "Download" button the program will download files from FTP server. When doing that I want the label to update e.g: "Connecting..." -> "Downloading..." -> "Downloaded!" I tried doing it with threading module but it seems to not work:
def updater(self):
self.updateStatusText.setText("Status: Connecting...")
thread = threading.Thread(target=self.download)
thread.start()
while thread.isAlive():
self.updateStatusText.setText("Status: Still Downloading...")
def download(self):
ftp = FTP('testdomain.com')
ftp.login(user='username', passwd='password')
ftp.cwd('/main_directory/')
filename = 'testfile.bin'
with open(filename, 'wb') as localfile:
ftp.retrbinary('RETR ' + filename, localfile.write, 1024)
ftp.quit()
localfile.close()
它只是下载文件,完全不更改文本标签.我必须在这里使用QThread吗?我也尝试使用asyncio,但是等待self.updateStatusText.setText("Connecting...")
似乎返回None,并且出现TypeError ...
It just downloads the file and doesn't change the text label at all. Do I have to use QThread here? I also tried using asyncio but awaiting self.updateStatusText.setText("Connecting...")
seems to return None and I get TypeError...
推荐答案
以下代码应执行以下操作:
The following code should do:
class DownloadThread(QtCore.QThread):
data_downloaded = QtCore.pyqtSignal(object)
def run(self):
self.data_downloaded.emit('Connecting...')
ftp = FTP('example.com')
ftp.login(user='user', passwd='password')
ftp.cwd('/main_directory/')
self.data_downloaded.emit('Downloading...')
filename = 'testfile.bin'
with open(filename, 'wb') as localfile:
ftp.retrbinary('RETR ' + filename, localfile.write)
ftp.quit()
self.data_downloaded.emit('Done')
class MainWindow(QtGui.QWidget):
def __init__(self):
super(MainWindow, self).__init__()
self.label = QtGui.QLabel
self.button = QtGui.QPushButton("Start")
self.button.clicked.connect(self.start_download)
layout = QtGui.QVBoxLayout()
layout.addWidget(self.button)
layout.addWidget(self.label)
self.setLayout(layout)
def start_download(self):
self.thread = DownloadThread()
self.thread.data_downloaded.connect(self.on_data_ready)
self.thread.start()
def on_data_ready(self, data):
self.label.setText(unicode(data))
基于:在多线程PyQT中更新GUI元素.
您的后续问题:从另一个运行FTP下载的线程更新PyQt进度
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