网址未使用不同类中的信号和插槽 PyQt5 定义
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【中文标题】网址未使用不同类中的信号和插槽 PyQt5 定义【英文标题】：Url not defined using Signals and slots PyQt5 in different classes 【发布时间】：2020-03-28 06:23:23 【问题描述】：我正在尝试使用线程并行运行带有参数的视频 所以当我点击 SD 按钮时，它会激活 TP1 和 TP2 按钮，并且每个按钮都有不同的 Url。
我想显示视频并启动 ProgressBar 并在最后显示结果。
from multiprocessing import Process
import sys
import json
import shlex
import threading
import subprocess
import webbrowser
from QLed import QLed
from functools import partial
from PyQt5.QtGui import QColor,QFont
from PyQt5.QtGui import QIcon, QPixmap
from PyQt5.QtGui import QPainter, QPen
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QPainter, QColor, QPen
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtCore import QDir, Qt, QUrl, QSize, QPoint, QTimer
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QMainWindow
from PyQt5 import QtCore, QtGui, QtWidgets, QtMultimedia, QtMultimediaWidgets
from PyQt5.QtWidgets import (QWidget, QPushButton, QApplication,QGridLayout, QLCDNumber)
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout, QGridLayout, QLCDNumber
class Analyzer(QtCore.QObject):
result_ready = QtCore.pyqtSignal(object)
def do_work(self, myurl):
cmd = "ffprobe -v quiet -print_format json -show_streams"
args = shlex.split(cmd)
args.append(myurl)
ffprobeOutput = subprocess.check_output(args).decode('utf-8')
ffprobeOutput = json.loads(ffprobeOutput)
result = ffprobeOutput['streams'][0]
self.result_ready.emit(result)
class MainProg(QtWidgets.QMainWindow):
def __init__(self):
super(MainProg, self).__init__()
self.resize(870, 525)
self.centralwidget = QtWidgets.QWidget(self)
self.centralwidget.setObjectName("centralwidget")
############################ The Viedeo and frame ######
self.frame = QtWidgets.QFrame(self)
self.frame.setGeometry(QtCore.QRect(450, 40, 391, 291))
self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
self.mediaPlayer = QtMultimedia.QMediaPlayer(self.frame)
self.viewer1 = QtMultimediaWidgets.QVideoWidget(self.frame)
self.mediaPlayer.setVideoOutput(self.viewer1)
layout1 = QtWidgets.QGridLayout(self.frame)
layout1.addWidget(self.viewer1, 0, 0, 1, 2)
#############################################################
self.progressBar = QtWidgets.QProgressBar(self.centralwidget)
self.progressBar.setGeometry(QtCore.QRect(110, 470, 143, 25))
self.progressBar.setProperty("value", 0)
self.progressBar.setTextVisible(True)
self.lcd = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd.setGeometry(QtCore.QRect(220, 50, 146, 50))
self.lcd1 = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd1.setGeometry(QtCore.QRect(220, 100, 146, 50))
self.lcd2 = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd2.setGeometry(QtCore.QRect(220, 150, 146, 50))
self.lcd3 = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd3.setGeometry(QtCore.QRect(220, 200, 146, 50))
self.lcd4 = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd4.setGeometry(QtCore.QRect(220, 250, 146, 50))
self.lcd5 = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd5.setGeometry(QtCore.QRect(220, 300, 146, 50))
self.lcd6 = QtWidgets.QLCDNumber(self.centralwidget)
self.lcd6.setGeometry(QtCore.QRect(220, 350, 146, 50))
self.txtt = QtWidgets.QLabel(self.centralwidget)
self.txtt.setFont(QFont('Arial', 12))
self.txtt.setGeometry(QtCore.QRect(20, 0, 300, 400))
self.txtt.setText("Video"
"\nCode Name .................."
"\n\nHorizont........................"
"\n\nVertical.........................."
"\n\nDisplay Aspect Ratio......"
"\n\nRefrence........................."
"\n\nB frames........................."
"\n\nStart Bits......................."
"\n\nSample Aspect ratio......."
"\n\nBit Rate.........................")
self.setCentralWidget(self.centralwidget)
self.statusbar = QtWidgets.QStatusBar(self)
self.statusbar.setObjectName("statusbar")
self.setStatusBar(self.statusbar)
#########################The buttons#################################
self.AASD = QtWidgets.QToolButton(self)
self.AASD.setGeometry(QtCore.QRect(140, 20, 31, 32))
self.AASD.setObjectName("AASD")
self.AASD.setText("SD")
self.AASD.clicked.connect(self.funcchoos)
QTimer.singleShot(5000, lambda: self.AASD.setDisabled(False))
self.Testpunk1 = QtWidgets.QToolButton(self)
self.Testpunk1.setGeometry(QtCore.QRect(150, 400, 31, 32))
self.Testpunk2 = QtWidgets.QToolButton(self)
self.Testpunk2.setGeometry(QtCore.QRect(150, 430, 31, 32))
self.Testpunk1.setText("TP1")
self.Testpunk2.setText("TP2")
self.Testpunk1.setObjectName("TP1")
self.Testpunk2.setObjectName("TP2")
self.Tp1 = QLed(self, onColour=QLed.Orange, shape=QLed.Circle)
self.Tp1.setGeometry(QtCore.QRect(185, 415, 25, 25))
self.Tp1.value = False
########################### the functions############################
def funcchoos (self):
QtCore.QTimer.singleShot(500, self.TPLed) # Using timer as QLed uses it in its tests
if self.sender().objectName() == "AASD":
self.Testpunk1.clicked.connect(self.MyUrl)
self.Testpunk2.clicked.connect(self.MyUrl)
return
def MyUrl(self):
TP1 = "293.168.1.6:1115"
TP2 = "239.168.1.7:1116"
if self.sender().objectName() == "TP1":
myurl = TP1
print("TP1 is playing")
self.dep3(myurl)
return
if self.sender().objectName() == "TP2":
myurl = TP2
self.dep3(myurl)
print(myurl)
print("TP2 is playing")
return
##############################################################
def TPLed(self):
self.Tp1.setValue(True) # the LED ON code
#########################################################################
def dep3(self,myurl):
# set progress bar to undetermined state and disable button
self.progressBar.setRange(0,0)
self.Testpunk1.setEnabled(False)
self.mediaPlayer.setMedia(QMediaContent(QUrl(myurl)))
self.mediaPlayer.play()
# create thread for doing heavy work
self.thread = QtCore.QThread()
self.worker = Analyzer()
self.worker.moveToThread(self.thread)
self.thread.started.connect(self.worker.do_work(myurl))
self.thread.finished.connect(self.worker.deleteLater)
self.worker.result_ready.connect(self.process_result)
self.worker.result_ready.connect(self.worker.do_work(myurl))
self.thread.start()
def process_result(self, result):
codec_name = result['codec_name']
width = result['width']
height = result['height']
display_aspect_ratio = result['display_aspect_ratio']
sample_aspect_ratio = result['sample_aspect_ratio']
refs = result['refs']
has_b_frames = result['has_b_frames']
self.lcd.display(has_b_frames)
self.lcd1.display(codec_name)
self.lcd2.display(width)
self.lcd3.display(height)
self.lcd4.display(display_aspect_ratio)
self.lcd5.display(sample_aspect_ratio)
self.lcd6.display(refs)
# reset progress bar and push button
self.progressBar.setRange(0,100)
self.progressBar.setValue(100)
self.pushButton.setEnabled(True)
print("done!!")
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
player = MainProg()
player.show()
sys.exit(app.exec_())
【问题讨论】：
【参考方案1】：主要问题是当你使用时：
foo.signal.connect(function(args))
等于
value = function(args)
foo.signal.connect(value)
这会导致错误，因为 connect 需要一个可调用对象，在您的情况下，值为 None 会导致错误。
一般的解决方案是使用 lambda 或 partials，但第一个会导致函数在主线程中执行，因为它是在该线程中调用的，因此必须丢弃它，而不是 partials 只添加参数。
λ：foo.signal.connect(lambda *_, args=args : function(args))
foo.signal.connect(functools.partial(function, args))
此外，您还有其他错误，例如每次调用“funcchoos”时，都会在“TestpunkX”和 MyUrl 之间创建一个新连接，导致每次按“TestpunkX”时，“MyUrl”被调用的次数与“ funcchoos 被调用“。
考虑到上述情况，我重写了您的代码，因为可能存在其他错误。
from functools import partial
import json
import shlex
import subprocess
import sys
from QLed import QLed
from PyQt5 import QtCore, QtGui, QtWidgets, QtMultimedia, QtMultimediaWidgets
class Analyzer(QtCore.QObject):
result_ready = QtCore.pyqtSignal(object)
@QtCore.pyqtSlot(str)
def do_work(self, myurl):
cmd = "ffprobe -v quiet -print_format json -show_streams"
args = shlex.split(cmd)
args.append(myurl)
ffprobeOutput = subprocess.check_output(args).decode("utf-8")
ffprobeOutput = json.loads(ffprobeOutput)
result = ffprobeOutput["streams"][0]
self.result_ready.emit(result)
class MainProg(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainProg, self).__init__(parent)
self.setFont(QtGui.QFont("Arial", 12))
central_widget = QtWidgets.QWidget()
self.setCentralWidget(central_widget)
hlay = QtWidgets.QHBoxLayout(central_widget)
left_widget = QtWidgets.QWidget()
self.mediaPlayer = QtMultimedia.QMediaPlayer()
self.video_widget = QtMultimediaWidgets.QVideoWidget()
self.video_widget.setContentsMargins(30, 30, 30, 30)
self.mediaPlayer.setVideoOutput(self.video_widget)
self.sd_button = QtWidgets.QToolButton(text="SD", checkable=True)
self.sd_button.setFixedSize(31, 32)
self.code_lcd = QtWidgets.QLCDNumber()
self.horizontal_lcd = QtWidgets.QLCDNumber()
self.vertical_lcd = QtWidgets.QLCDNumber()
self.display_aspect_ratio_lcd = QtWidgets.QLCDNumber()
self.reference_lcd = QtWidgets.QLCDNumber()
self.b_frames_lcd = QtWidgets.QLCDNumber()
self.start_bits_lcd = QtWidgets.QLCDNumber()
self.sample_aspect_ratio_lcd = QtWidgets.QLCDNumber()
self.bit_rate_lcd = QtWidgets.QLCDNumber()
self.tp1_button = QtWidgets.QToolButton(text="TP1")
self.tp2_button = QtWidgets.QToolButton(text="TP2")
self.led = QLed(self, onColour=QLed.Orange, shape=QLed.Circle)
self.progressbar = QtWidgets.QProgressBar()
for lcd in (
self.code_lcd,
self.horizontal_lcd,
self.vertical_lcd,
self.display_aspect_ratio_lcd,
self.reference_lcd,
self.b_frames_lcd,
self.start_bits_lcd,
self.sample_aspect_ratio_lcd,
self.bit_rate_lcd,
):
lcd.setFixedSize(146, 50)
hlay.addWidget(left_widget)
hlay.addWidget(self.video_widget, stretch=1)
lay = QtWidgets.QGridLayout(left_widget)
lay.setVerticalSpacing(5)
for i, (text, widget) in enumerate(
zip(
(
"Video",
"Codec Name:",
"Horizontal:",
"Vertical:",
"Display Aspect Ratio:",
"Refrence:",
"B frames:",
"Start Bits:",
"Sample Aspect ratio:",
"Bit Rate:",
),
(
self.sd_button,
self.code_lcd,
self.horizontal_lcd,
self.vertical_lcd,
self.display_aspect_ratio_lcd,
self.reference_lcd,
self.b_frames_lcd,
self.start_bits_lcd,
self.sample_aspect_ratio_lcd,
self.bit_rate_lcd,
),
)
):
label = QtWidgets.QLabel(text)
lay.addWidget(label, i, 0)
lay.addWidget(widget, i, 1, alignment=QtCore.Qt.AlignCenter)
vlay = QtWidgets.QVBoxLayout()
vlay.addWidget(self.tp1_button)
vlay.addWidget(self.tp2_button)
hlay2 = QtWidgets.QHBoxLayout()
hlay2.addStretch(0)
hlay2.addLayout(vlay)
hlay2.addWidget(self.led)
hlay2.addStretch(0)
lay.addLayout(hlay2, lay.rowCount(), 0, 1, 2)
lay.addWidget(self.progressbar, lay.rowCount(), 0, 1, 2)
lay.setRowStretch(lay.rowCount(), 1)
self.resize(960, 480)
self.sd_button.toggled.connect(self.led.setValue)
self.tp1_button.clicked.connect(self.on_tp_clicked)
self.tp2_button.clicked.connect(self.on_tp_clicked)
self.current_button = None
thread = QtCore.QThread(self)
thread.start()
self.worker = Analyzer()
self.worker.moveToThread(thread)
self.worker.result_ready.connect(self.process_result)
@QtCore.pyqtSlot()
def on_tp_clicked(self):
if self.sd_button.isChecked():
urls_map =
self.tp1_button: "293.168.1.6:1115",
self.tp2_button: "239.168.1.7:1116",
url = urls_map.get(self.sender(), "")
if url:
self.play(url)
self.current_button = self.sender()
self.current_button.setEnabled(False)
def play(self, url):
self.progressbar.setRange(0, 0)
self.mediaPlayer.setMedia(QtMultimedia.QMediaContent(QtCore.QUrl(url)))
self.mediaPlayer.play()
wrapper = partial(self.worker.do_work, url)
QtCore.QTimer.singleShot(0, wrapper)
@QtCore.pyqtSlot(object)
def process_result(self, result):
self.current_button.setEnabled(True)
self.current_button = None
self.progressbar.setRange(0, 1)
self.progressbar.setValue(0)
for lcd, key in zip(
(
self.code_lcd,
self.b_frames_lcd,
self.horizontal_lcd,
self.vertical_lcd,
self.display_aspect_ratio_lcd,
self.sample_aspect_ratio_lcd,
self.reference_lcd,
),
(
"codec_name",
"has_b_frames",
"width",
"height",
"display_aspect_ratio",
"sample_aspect_ratio",
"refs",
),
):
value = result.get(key, 0)
lcd.display(value)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainProg()
w.show()
sys.exit(app.exec_())
虽然我看不出需要使用线程，但在这种情况下使用 QProcess 会更容易。
from functools import partial
import json
import shlex
import sys
from QLed import QLed
from PyQt5 import QtCore, QtGui, QtWidgets, QtMultimedia, QtMultimediaWidgets
class MainProg(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainProg, self).__init__(parent)
self.setFont(QtGui.QFont("Arial", 12))
central_widget = QtWidgets.QWidget()
self.setCentralWidget(central_widget)
hlay = QtWidgets.QHBoxLayout(central_widget)
left_widget = QtWidgets.QWidget()
self.mediaPlayer = QtMultimedia.QMediaPlayer()
self.video_widget = QtMultimediaWidgets.QVideoWidget()
self.video_widget.setContentsMargins(30, 30, 30, 30)
self.mediaPlayer.setVideoOutput(self.video_widget)
self.sd_button = QtWidgets.QToolButton(text="SD", checkable=True)
self.sd_button.setFixedSize(31, 32)
self.code_lcd = QtWidgets.QLCDNumber()
self.horizontal_lcd = QtWidgets.QLCDNumber()
self.vertical_lcd = QtWidgets.QLCDNumber()
self.display_aspect_ratio_lcd = QtWidgets.QLCDNumber()
self.reference_lcd = QtWidgets.QLCDNumber()
self.b_frames_lcd = QtWidgets.QLCDNumber()
self.start_bits_lcd = QtWidgets.QLCDNumber()
self.sample_aspect_ratio_lcd = QtWidgets.QLCDNumber()
self.bit_rate_lcd = QtWidgets.QLCDNumber()
self.tp1_button = QtWidgets.QToolButton(text="TP1")
self.tp2_button = QtWidgets.QToolButton(text="TP2")
self.led = QLed(self, onColour=QLed.Orange, shape=QLed.Circle)
self.progressbar = QtWidgets.QProgressBar()
for lcd in (
self.code_lcd,
self.horizontal_lcd,
self.vertical_lcd,
self.display_aspect_ratio_lcd,
self.reference_lcd,
self.b_frames_lcd,
self.start_bits_lcd,
self.sample_aspect_ratio_lcd,
self.bit_rate_lcd,
):
lcd.setFixedSize(146, 50)
hlay.addWidget(left_widget)
hlay.addWidget(self.video_widget, stretch=1)
lay = QtWidgets.QGridLayout(left_widget)
lay.setVerticalSpacing(5)
for i, (text, widget) in enumerate(
zip(
(
"Video",
"Codec Name:",
"Horizontal:",
"Vertical:",
"Display Aspect Ratio:",
"Refrence:",
"B frames:",
"Start Bits:",
"Sample Aspect ratio:",
"Bit Rate:",
),
(
self.sd_button,
self.code_lcd,
self.horizontal_lcd,
self.vertical_lcd,
self.display_aspect_ratio_lcd,
self.reference_lcd,
self.b_frames_lcd,
self.start_bits_lcd,
self.sample_aspect_ratio_lcd,
self.bit_rate_lcd,
),
)
):
label = QtWidgets.QLabel(text)
lay.addWidget(label, i, 0)
lay.addWidget(widget, i, 1, alignment=QtCore.Qt.AlignCenter)
vlay = QtWidgets.QVBoxLayout()
vlay.addWidget(self.tp1_button)
vlay.addWidget(self.tp2_button)
hlay2 = QtWidgets.QHBoxLayout()
hlay2.addStretch(0)
hlay2.addLayout(vlay)
hlay2.addWidget(self.led)
hlay2.addStretch(0)
lay.addLayout(hlay2, lay.rowCount(), 0, 1, 2)
lay.addWidget(self.progressbar, lay.rowCount(), 0, 1, 2)
lay.setRowStretch(lay.rowCount(), 1)
self.resize(960, 480)
self.sd_button.toggled.connect(self.led.setValue)
self.tp1_button.clicked.connect(self.on_tp_clicked)
self.tp2_button.clicked.connect(self.on_tp_clicked)
self.current_button = None
self.process = QtCore.QProcess(self)
self.process.finished.connect(self.on_finish)
@QtCore.pyqtSlot()
def on_tp_clicked(self):
if self.sd_button.isChecked():
urls_map =
self.tp1_button: "293.168.1.6:1115",
self.tp2_button: "239.168.1.7:1116",
url = urls_map.get(self.sender(), "")
if url:
self.play(url)
self.current_button = self.sender()
self.current_button.setEnabled(False)
def play(self, url):
self.progressbar.setRange(0, 0)
self.mediaPlayer.setMedia(QtMultimedia.QMediaContent(QtCore.QUrl(url)))
self.mediaPlayer.play()
cmd = "ffprobe -v quiet -print_format json -show_streams"
program, *args = shlex.split(cmd)
args.append(url)
self.process.start(program, args)
@QtCore.pyqtSlot()
def on_finish(self):
data = self.process.readAllStandardOutput().data()
if data:
ffprobeOutput = json.loads(data)
result = ffprobeOutput['streams'][0]
for lcd, key in zip(
(
self.code_lcd,
self.b_frames_lcd,
self.horizontal_lcd,
self.vertical_lcd,
self.display_aspect_ratio_lcd,
self.sample_aspect_ratio_lcd,
self.reference_lcd,
),
(
"codec_name",
"has_b_frames",
"width",
"height",
"display_aspect_ratio",
"sample_aspect_ratio",
"refs",
),
):
value = result.get(key, 0)
lcd.display(value)
self.current_button.setEnabled(True)
self.current_button = None
self.progressbar.setRange(0, 1)
self.progressbar.setValue(0)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainProg()
w.show()
sys.exit(app.exec_())
【讨论】：
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