如何使用 PyQt5 QThread 從 CLASS(ShowVideo) 中獲取值以在第二個 CLASS(ImageViewer) 中使用（根據我的程序）

Question

我正在嘗試檢索x的值，即來自 class ShowVideo的計數器，並在ImageViewer class 的按鈕中顯示計數器。 視頻運行完美，但我沒有了解如何在視頻開始運行時顯示計數器的邏輯。 所有的 function 應該同時工作，這里i作為變量是在 function startVideo()中聲明的計數器名稱，它位於showVideo class 下。 我想更新按鈕上的值，即button_in(class ImageViewer, method InitUI())作為計數器。

'''

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

可能最簡單的方法是在ShowVideo.VideoSignal ShowVideo.startVedio vid.VideoSignal到image_viewer.setText時，用圖像發出幀號，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)) )