我如何使用pafy制作进度条的线程

我如何使用pafy制作进度条的线程

转移到另一个线程的一种方法是创建一个

QObject

驻留在另一个线程中的线程，并在插槽中执行该任务。并且该插槽必须通过

QmetaObject::invokeMethod

或信号来调用。

with QThread and QmetaObject::invokeMethod:

import pafyfrom PyQt5 import QtCore, QtWidgetsclass MainWindow(QtWidgets.QMainWindow):    def __init__(self, parent=None):        super(MainWindow, self).__init__(parent)        central_widget = QtWidgets.QWidget()        self.setCentralWidget(central_widget)        self.le_url = QtWidgets.QLineEdit("https://www.youtube.com/watch?v=bMt47wvK6u0")        path = QtCore.QStandardPaths.writableLocation(QtCore.QStandardPaths.DownloadLocation)        self.le_output = QtWidgets.QLineEdit(path)        self.btn_quality = QtWidgets.QPushButton("Get qualities")        self.combo_quality = QtWidgets.QComboBox()        self.btn_download = QtWidgets.QPushButton("Download")        self.progressbar = QtWidgets.QProgressBar(maximum=100)        self.downloader = DownLoader()        thread = QtCore.QThread(self)        thread.start()        self.downloader.moveToThread(thread)        self.btn_quality.clicked.connect(self.on_clicked_quality)        self.btn_download.clicked.connect(self.download)        self.btn_download.setDisabled(True)        self.downloader.progressChanged.connect(self.progressbar.setValue)        self.downloader.qualitiesChanged.connect(self.update_qualityes)        self.downloader.finished.connect(self.on_finished)        form_lay = QtWidgets.QFormLayout(central_widget)        form_lay.addRow("Url: ", self.le_url)        form_lay.addRow(self.btn_quality)        form_lay.addRow("qualities: ", self.combo_quality)        form_lay.addRow("Output: ", self.le_output)         form_lay.addRow(self.btn_download)          form_lay.addRow(self.progressbar)    @QtCore.pyqtSlot()    def on_finished(self):        self.update_disables(False)    @QtCore.pyqtSlot()    def on_clicked_quality(self):        video_url = self.le_url.text()        QtCore.QmetaObject.invokeMethod(self.downloader, "get_qualities", QtCore.Qt.QueuedConnection, QtCore.Q_ARG(str, video_url))    @QtCore.pyqtSlot(list)    def update_qualityes(self, types_of_video):        for t in types_of_video: self.combo_quality.addItem(str(t), t)        self.btn_download.setDisabled(False)    @QtCore.pyqtSlot()    def download(self):        video_save = self.le_output.text()        d = self.combo_quality.currentData()        QtCore.QmetaObject.invokeMethod(self.downloader, "start_download", QtCore.Qt.QueuedConnection, QtCore.Q_ARG(object, d), QtCore.Q_ARG(str, video_save))        self.update_disables(True)    def update_disables(self, state):        self.combo_quality.setDisabled(state)        self.btn_quality.setDisabled(state)        self.le_output.setDisabled(state)        self.le_url.setDisabled(state)        self.btn_download.setDisabled(not state)class DownLoader(QtCore.QObject):    progressChanged = QtCore.pyqtSignal(int)    qualitiesChanged = QtCore.pyqtSignal(list)    finished = QtCore.pyqtSignal()    @QtCore.pyqtSlot(str)    def get_qualities(self, video_url):        pafy_video = pafy.new(video_url)        types_of_video = pafy_video.allstreams # videostreams        self.qualitiesChanged.emit(types_of_video)    @QtCore.pyqtSlot(object, str)    def start_download(self, d, filepath):        d.download(filepath=filepath, callback=self.callback)    def callback(self, total, recvd, ratio, rate, eta):        val = int(ratio * 100)        self.progressChanged.emit(val)        if val == 100: self.finished.emit()if __name__ == '__main__':    import sys    app = QtWidgets.QApplication(sys.argv)    w = MainWindow()    w.resize(320, 480)    w.show()    sys.exit(app.exec_())

with threading.Thread

：

import pafyimport threadingfrom PyQt5 import QtCore, QtWidgetsclass MainWindow(QtWidgets.QMainWindow):    qualitiesChanged = QtCore.pyqtSignal(list)    progressChanged = QtCore.pyqtSignal(int)    finished = QtCore.pyqtSignal()    def __init__(self, parent=None):        super(MainWindow, self).__init__(parent)        central_widget = QtWidgets.QWidget()        self.setCentralWidget(central_widget)        self.le_url = QtWidgets.QLineEdit("https://www.youtube.com/watch?v=bMt47wvK6u0")        path = QtCore.QStandardPaths.writableLocation(QtCore.QStandardPaths.DownloadLocation)        self.le_output = QtWidgets.QLineEdit(path)        self.btn_quality = QtWidgets.QPushButton("Get qualities")        self.combo_quality = QtWidgets.QComboBox()        self.btn_download = QtWidgets.QPushButton("Download")        self.progressbar = QtWidgets.QProgressBar(maximum=100)        self.btn_quality.clicked.connect(self.on_clicked_quality)        self.btn_download.clicked.connect(self.download)        self.btn_download.setDisabled(True)        self.progressChanged.connect(self.progressbar.setValue)        self.qualitiesChanged.connect(self.update_qualityes)        self.finished.connect(self.on_finished)        form_lay = QtWidgets.QFormLayout(central_widget)        form_lay.addRow("Url: ", self.le_url)        form_lay.addRow(self.btn_quality)        form_lay.addRow("qualities: ", self.combo_quality)        form_lay.addRow("Output: ", self.le_output)         form_lay.addRow(self.btn_download)          form_lay.addRow(self.progressbar)    @QtCore.pyqtSlot()    def on_finished(self):        self.update_disables(False)    @QtCore.pyqtSlot()    def on_clicked_quality(self):        video_url = self.le_url.text()        threading.Thread(target=self.get_qualities, args=(video_url,)).start()    def get_qualities(self, video_url):        pafy_video = pafy.new(video_url)        types_of_video = pafy_video.allstreams # videostreams        self.qualitiesChanged.emit(types_of_video)    @QtCore.pyqtSlot(list)    def update_qualityes(self, types_of_video):        for t in types_of_video: self.combo_quality.addItem(str(t), t)        self.btn_download.setDisabled(False)    @QtCore.pyqtSlot()    def download(self):        video_save = self.le_output.text()        d = self.combo_quality.currentData()        threading.Thread(target=d.download, kwargs={'filepath': video_save, 'callback': self.callback}, daemon=True).start()    def callback(self, total, recvd, ratio, rate, eta):        print(ratio)        val = int(ratio * 100)        self.progressChanged.emit(val)        if val == 100: self.finished.emit()    def update_disables(self, state):        self.combo_quality.setDisabled(state)        self.btn_quality.setDisabled(state)        self.le_output.setDisabled(state)        self.le_url.setDisabled(state)        self.btn_download.setDisabled(not state)if __name__ == '__main__':    import sys    app = QtWidgets.QApplication(sys.argv)    w = MainWindow()    w.resize(320, 480)    w.show()    sys.exit(app.exec_())