如何使用带有 pyqt4 的 Thread 并行运行两个程序

Question

在我的示例程序中，我想在我的进程完成之前显示我的 gif。在我的进程自动完成后，我的 gif 将关闭。因为我在这里使用了线程功能，但我无法显示 gif。但我没有不知道我在这个程序中哪里出错了，所以任何人都可以检查这个程序并请指导我。提前谢谢你。 下面是我的代码：

import sys
from PyQt4 import QtGui
import os

class DialogThread(QtCore.QThread):

    def __init__(self, interval=1):
        self.interval = interval

        thread = threading.Thread(target=self.run, args=())
        thread.daemon = True                            # Daemonize thread
        thread.start()                                  # Start the execution
    def run(self):
        global savingDataFlag,dialog_gif
        """ Method that runs forever """

        while True:
            if savingDataFlag == True:
                dialog_gif.run()
                print 'in saving data true loop'
            else:
                dialog_gif.close()
                print 'in saving data false loop'
                time.sleep(3)

class Dialog(QtGui.QDialog):
    def __init__(self, parent = None):
        super(Dialog, self).__init__(parent)

        self.setStyleSheet("QDialog {background-color:black; color:white }")
        self.label1 = QtGui.QLabel(
            text="Please Wait while It Is Processing The Data...",
            font=QtGui.QFont("Times", 20,weight=QtGui.QFont.Bold)
        )
        self.label21 = QtGui.QLabel()

        vbox1 = QtGui.QVBoxLayout(self)
        vbox1.addWidget(self.label1)
        vbox1.addWidget(self.label21)
        self.resize(640, 480)

    @QtCore.pyqtSlot()
    def show_gif(self):
        movie = QtGui.QMovie(
            "./img/loading1.gif",
            parent=self
        )
        self.label21.setMovie(movie)
        movie.start()
        self.exec_()class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):

        okButton = QtGui.QPushButton("Save")
        cancelButton = QtGui.QPushButton("Cancel")
        okButton.clicked.connect(self.save)

        hbox = QtGui.QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(okButton)
        hbox.addWidget(cancelButton)

        vbox = QtGui.QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        self.setLayout(vbox)

        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('Buttons')
        self.show()
    def save(self):
        self.d1 = QtGui.QWidget()
        self.form1 = QtGui.QFormLayout(self.d1)
        self.name_file = QtGui.QLabel(("File Name:"))
        self.line_edit1 = QtGui.QLineEdit()
        self.saveBtn1 = QtGui.QPushButton(("Save"))
        self.saveBtn1.clicked.connect(self.saveModelWidget)
        self.canclebtn = QtGui.QPushButton(("Cancel"))
        self.form1.addRow(self.name_file, self.line_edit1)
        self.form1.addRow( self.canclebtn,self.saveBtn1)
        self.d1.setWindowTitle("Enter Grids")
        self.d1.setGeometry(450,300,500,100)
        self.d1.show()
    def saveModelWidget(self):
        self.savefile()
    def savefile(self):
        self.d1.close()
        self.save_text = self.line_edit1.text()
        self.currFilePath = os.getcwd()
        if self.save_text.endsWith(".csv"):
            file_Name= self.save_text
            with open(file_Name, 'w+')as f:
                    dir_path1 =os.getcwd()
                    save_filename = os.path.join(dir_path1,file_Name)
        print "prrocess start"
        # here some execution
        # when i click the save button i want to display the gif file till to complete the process in save file
        print "process ends"

def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Answer 1

您正在将 QThread 与 threading 模块一起使用，并且 QThread 不使用它，因为它从不启动它，而是使用线程来执行 run() 方法。另一方面，重写 QThread 的 run 方法是一种方法，但有很多限制，相反，我将创建一个工作在另一个线程中的工作人员。另一个错误是电影是一个局部变量，将被删除因此它不会显示，解决方案是将其传递给父级。考虑到上述解决方案是：

import os
import sys
import threading
from PyQt4 import QtCore, QtGui

class SaveWorker(QtCore.QObject):
    started = QtCore.pyqtSignal()
    finished = QtCore.pyqtSignal()

    @QtCore.pyqtSlot(str)
    def save_file(self, filename):
        self.started.emit()
        for i in range(100000):
            print(i)
        with open(filename, 'w+')as f:
            print(filename)
            # some execution
        self.finished.emit()

class GifDialog(QtGui.QDialog):
    def __init__(self, parent = None):
        super(GifDialog, self).__init__(parent)

        self.setStyleSheet("QDialog {background-color:black; color:white }")
        self.label1 = QtGui.QLabel(
            text="Please Wait while It Is Processing The Data...",
            font=QtGui.QFont("Times", 20,weight=QtGui.QFont.Bold)
        )
        self.label2 = QtGui.QLabel()

        vbox = QtGui.QVBoxLayout(self)
        vbox.addWidget(self.label1)
        vbox.addWidget(self.label2)

    @QtCore.pyqtSlot()
    def show_gif(self):
        movie = QtGui.QMovie(
            "./img/loading1.gif", 
            parent=self
        )
        self.label2.setMovie(movie)
        movie.start()
        self.show()

class FormDialog(QtGui.QDialog):
    def __init__(self, parent=None):
        super(FormDialog, self).__init__(parent)
        self.setWindowTitle("Enter Grids")
        self.line_edit = QtGui.QLineEdit()
        self.savebtn = QtGui.QPushButton(
            text="Save",
            clicked=self.save
        )
        self.cancelbtn = QtGui.QPushButton("Cancel")
        #self.savebtn.clicked.connect(self.saveModelWidget)

        flay = QtGui.QFormLayout(self)
        flay.addRow("File Name:", self.line_edit)
        flay.addRow(self.cancelbtn, self.savebtn)
        self.worker = SaveWorker()
        self.gif_dialog = GifDialog(self)
        self.worker.started.connect(self.gif_dialog.show_gif)
        self.worker.finished.connect(self.close)

    @QtCore.pyqtSlot()
    def save(self):
        filename = str(self.line_edit.text())
        if filename.endswith(".csv"):
            save_filename = os.path.join(os.getcwd(), filename)
            thread = threading.Thread(target=self.worker.save_file, args=(save_filename,))
            thread.daemon = True
            thread.start()

class Example(QtGui.QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):
        okButton = QtGui.QPushButton(
            text="Save",
            clicked=self.on_clicked
        )
        cancelButton = QtGui.QPushButton("Cancel")
        # okButton.clicked.connect(self.save)
        hbox = QtGui.QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(okButton)
        hbox.addWidget(cancelButton)
        vbox = QtGui.QVBoxLayout(self)
        vbox.addStretch(1)
        vbox.addLayout(hbox)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        dialog = FormDialog()
        dialog.exec_()

def main():
    app = QtGui.QApplication(sys.argv)
    dialog = Example()
    dialog.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()