如何使用 PyQt5 QThread 从 CLASS(ShowVideo) 中获取值以在第二个 CLASS(ImageViewer) 中使用（根据我的程序）

Question

我正在尝试检索x的值，即来自 class ShowVideo的计数器，并在ImageViewer class 的按钮中显示计数器。 视频运行完美，但我没有了解如何在视频开始运行时显示计数器的逻辑。 所有的 function 应该同时工作，这里i作为变量是在 function startVideo()中声明的计数器名称，它位于showVideo class 下。 我想更新按钮上的值，即button_in(class ImageViewer, method InitUI())作为计数器。

'''

import cv2
import numpy as np
import sys
from PyQt5 import QtCore
from PyQt5 import QtWidgets
from PyQt5 import QtGui
from PyQt5.QtCore import pyqtSignal,QRect,QThread
from PyQt5.QtWidgets import *
from PyQt5.QtGui import QPixmap

filenameOpen =0

class ShowVideo(QtCore.QObject):# its only running a videooo

    camera = cv2.VideoCapture(filenameOpen)

    VideoSignal = QtCore.pyqtSignal(QtGui.QImage)


#############################################
    # newValue=QtCore.pyqtSignal(int)
    # stopped= pyqtSignal()
#################################################    
    def __init__(self, parent = None):
        # super(ShowVideo, self).__init__(parent)
        super().__init__()

    @QtCore.pyqtSlot()
    def startVideo(self):

        run_video = True
        #     self.counterThread.startVideo()QImage
        x=0
        while run_video:
            # ret, image = self.camera.read()
            ret, image = self.camera.read()
            height, width, channels = image.shape
            frame=image.copy()
            frameClone = frame.copy()       
            # frame = cv2.resize(frame, (1920, 1080))

            color_swapped_image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            height, width, _ = color_swapped_image.shape


            qt_image = QtGui.QImage(color_swapped_image.data,
                                    width, 
                                    height,
                                    color_swapped_image.strides[0],
                                    QtGui.QImage.Format_RGB888)                    
            self.VideoSignal.emit(qt_image) 
            # return x
            # print(x)
            # x=x+1

class ImageViewer(QtWidgets.QMainWindow):
    def __init__(self, parent = None):
        super().__init__()
        left=0
        top=0
        width=1920
        height=1080
        iconName="icon.png"
        self.setWindowIcon(QtGui.QIcon(iconName))
        self.setGeometry(left,top,width,height)
        self.image = QtGui.QImage()
        self.initUI()
        self.show()

    def initUI(self):
        self.setWindowTitle('Emotion Analysis')
        button_video = QPushButton(self)
        button_file = QPushButton(self)
        button_play = QPushButton(self)
        self.button_in=QPushButton(self)
        button_out=QPushButton(self)
        button_total=QPushButton(self)
        self.button_stop = QPushButton(self)
        self.label_image=QLabel(self)
        label_image_blank=QLabel(self)
        label_in=QLabel(self)
        label_out=QLabel(self)
        label_total=QLabel(self)    

        # button definations>>>>>>>>>>>>>>>>>>>>
        button_video.setGeometry((QRect(10,30,90,65)))# syntax(x,y,<>,^)
        button_video.setIcon(QtGui.QIcon("securitycamera.png"))
        button_video.setIconSize(QtCore.QSize(50,50))
        # button.setToolTip("This is Click Me Button")
        button_video.setToolTip("<h4>Live Stream<h4>")
        button_video.clicked.connect(vid.startVideo)

        button_file.setGeometry((QRect(110,30,90,65)))# syntax(x,y,<>,^)
        button_file.setIcon(QtGui.QIcon("file.png"))
        button_file.setIconSize(QtCore.QSize(50,50))
        button_file.setToolTip("<h4>Add new connection<h4>")
        button_file.clicked.connect(QtWidgets.qApp.quit) # this line is also working condition, the quit() method is defined above 

        button_play.setGeometry((QRect(1710,30,90,65)))# syntax(x,y,<>,^)
        # button_play.setGeometry((QRect(1710,300,90,65)))# syntax(x,y,<>,^)
        button_play.setIcon(QtGui.QIcon("play_red.png"))
        button_play.setIconSize(QtCore.QSize(50,50))
        button_play.setToolTip("<h4>Play video<h4>")
        button_play.clicked.connect(vid.startVideo)

        self.button_stop.setGeometry((QRect(1820,30,90,65)))# syntax(x,y,<>,^)
        self.button_stop.setIcon(QtGui.QIcon("stop.png"))
        self.button_stop.setIconSize(QtCore.QSize(50,50))
        self.button_stop.setToolTip("<h4>Stop Video<h4>")
        self.button_stop.clicked.connect(QApplication.instance().quit)
#############################################################
        self.button_in.setGeometry((QRect(1710,500,90,45)))# syntax(x,y,<>,^)
        self.button_in.setText("0")# it should be updated while counter runs
        # self.button_in.setText(x)
        self.button_in.setFont(QtGui.QFont("Sanserif",20))

        # self.counterThread=QThread()
        # self.counter=ShowVideo()
        # self.counter.moveToThread(self.counterThread)
        # self.button_in.clicked.connect(self.startCounting)
        # self.vid.newValue.connect(self.button_in.setText)
        # self.counterThread.started.connect(self.counter.startVideo)





#####################################################################
        button_out.setGeometry((QRect(1710,550,90,45)))# syntax(x,y,<>,^)
        button_out.setText("0")
        button_out.setFont(QtGui.QFont("Sanserif",20))

        button_total.setGeometry((QRect(1710,600,90,45)))# syntax(x,y,<>,^)
        button_total.setText("0")
        button_total.setFont(QtGui.QFont("Sanserif",20))


        # label definations>>>>>>>>>>>>>>>>>>>>

        self.label_image.setGeometry((QRect(10,110,1500,900))) # syntax(x,y,<>,^)
        self.label_image.setPixmap(QPixmap("black.jpg"))
        self.label_image.setScaledContents(True)

        label_in.setGeometry((QRect(1600,500,100,50))) # syntax(x,y,<>,^)
        label_in.setText("In")
        label_in.setFont(QtGui.QFont("Sanserif",20))

        label_out.setGeometry((QRect(1600,550,100,50))) # syntax(x,y,<>,^)
        label_out.setText("Out")
        label_out.setFont(QtGui.QFont("Sanserif",20))

        label_total.setGeometry((QRect(1600,600,100,50))) # syntax(x,y,<>,^)
        label_total.setText("Total")
        label_total.setFont(QtGui.QFont("Sanserif",20))     

    @QtCore.pyqtSlot(QtGui.QImage)
    def setImage(self, image):
        self.label_image.setPixmap(QPixmap.fromImage(image))
        # self.vid.newValue.connect(self.button_in.setText)



    # @QtCore.pyqtSlot(int)
    # def startCounting(self,x):
    # #     # if not self.counterThread.isRunning():
    # #     #     self.counterThread.startVideo()
    # #     # pass
    #     self.vid.newValue.connect(self.button_in.setText)

if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    thread = QtCore.QThread() #thread declareation
    thread.start()
    vid = ShowVideo() # calling 1st class
    vid.moveToThread(thread)
    image_viewer = ImageViewer() #calling second class 
    vid.VideoSignal.connect(image_viewer.setImage)  
    # vid.VideoSignal.connect(image_viewer.startCounting)   
    sys.exit(app.exec_()) '''

Answer 1

可能最简单的方法是在ShowVideo.VideoSignal ShowVideo.startVedio vid.VideoSignal到image_viewer.setText时，用图像发出帧号，即

class ShowVideo(QtCore.QObject):

    VideoSignal = QtCore.pyqtSignal(QtGui.QImage, int)

    ....

    @QtCore.pyqtSlot()
    def startVideo(self):

        ....

        x += 1
        self.VideoSignal.emit(qt_image, x)

....

if __name__ == '__main__':

    ....

    vid.VideoSignal.connect(lambda img, frame: image_viewer.button_in.setText(str(frame)) )