- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我使用 PyQt5
开发的 GUI 遇到问题。
应用尝试从不同的线程更新窗口进度条的值(QThreadPool())
。当它尝试更新进度条时,Python 会发出如下警告:
QObject::setParent: Cannot set parent, new parent is in a different thread
这在一定程度上不会影响应用程序,但一段时间后应用程序会崩溃并显示以下错误消息。
QBackingStore::endPaint() called with active painter on backingstore paint device
有人可以帮我摆脱第一个警告吗?我想这会解决问题。
我将发布代码的最小示例。
main.py
import sys
from PyQt5.QtCore import *
from PyQt5 import QtCore, QtGui, QtWidgets
import thread_for_audio_record
import time
class FW(object):
def __init__(self):
self.threadpool = QThreadPool()
def f_w(self, window):
self.window = window
self.window.setObjectName("Test")
self.window.resize(1054, 700)
self.window.setStyleSheet("background-color: rgb(180, 180, 180);")
self.central_widget = QtWidgets.QWidget(self.window)
self.central_widget.setObjectName("centralwidget")
self.horizontal_layout = QtWidgets.QHBoxLayout(self.central_widget)
self.horizontal_layout.setObjectName("horizontalLayout")
spacer_item = QtWidgets.QSpacerItem(129, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
self.horizontal_layout.addItem(spacer_item)
self.vertical_layout = QtWidgets.QVBoxLayout()
self.vertical_layout.setObjectName("verticalLayout")
spacer_item_1 = QtWidgets.QSpacerItem(128, 13, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
self.vertical_layout.addItem(spacer_item_1)
self.label_utterance = QtWidgets.QLabel(self.central_widget)
font = QtGui.QFont()
font.setPointSize(15)
font.setBold(True)
font.setBold(True)
font.setWeight(75)
self.label_utterance.setFont(font)
self.label_utterance.setAlignment(QtCore.Qt.AlignCenter)
self.label_utterance.setObjectName("label_utterance")
self.vertical_layout.addWidget(self.label_utterance)
self.text_edit_utterance = QtWidgets.QTextEdit(self.central_widget)
self.text_edit_utterance.setStyleSheet("background-color: rgb(255, 255, 255);")
self.text_edit_utterance.setObjectName("text_edit_utterance")
self.text_edit_utterance.setReadOnly(True)
self.text_edit_utterance.setFont(font)
self.vertical_layout.addWidget(self.text_edit_utterance)
self.line_edit_message_for_user = QtWidgets.QLineEdit(self.central_widget)
self.line_edit_message_for_user.setStyleSheet("background-color: rgb(255, 255, 255);")
self.line_edit_message_for_user.setObjectName("lineEdit")
self.progressBar = QtWidgets.QProgressBar(self.central_widget)
self.progressBar.setProperty("value", 0)
self.progressBar.setObjectName("progressBar")
self.vertical_layout.addWidget(self.progressBar)
self.vertical_layout.addWidget(self.line_edit_message_for_user)
self.push_button_start_recording = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_start_recording.setFont(font)
self.push_button_start_recording.setStyleSheet("background-color: rgb(85, 170, 0);")
self.push_button_start_recording.setObjectName("pushButton_start_
recording")
self.push_button_start_recording.clicked.connect(self.start_button_
func)
self.vertical_layout.addWidget(self.push_button_start_recording)
self.push_button_end_recording = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_end_recording.setFont(font)
self.push_button_end_recording.setStyleSheet("background-color: rgb(182, 0, 0);")
self.push_button_end_recording.setObjectName("pushButton_end_
recording")
self.vertical_layout.addWidget(self.push_button_end_recording)
self.label_status = QtWidgets.QLabel(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.label_status.setFont(font)
self.label_status.setObjectName("label_status")
self.vertical_layout.addWidget(self.label_status)
self.text_edit_status = QtWidgets.QTextEdit(self.central_widget)
self.text_edit_status.setStyleSheet("background-color: rgb(255, 255, 255);")
self.text_edit_status.setObjectName("textEdit_status")
self.text_edit_status.setReadOnly(True)
self.vertical_layout.addWidget(self.text_edit_status)
self.push_button_record_again = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_record_again.setFont(font)
self.push_button_record_again.setStyleSheet("background-color: rgb(255, 255, 127);")
self.push_button_record_again.setObjectName("pushButton_record_
again")
self.vertical_layout.addWidget(self.push_button_record_again)
self.push_button_next_utterance = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_next_utterance.setFont(font)
self.push_button_next_utterance.setStyleSheet("background-color: rgb(85, 170, 0);")
self.push_button_next_utterance.setObjectName("pushButton_next_
utterance")
self.vertical_layout.addWidget(self.push_button_next_utterance)
spacer_item_2 = QtWidgets.QSpacerItem(128, 13, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
self.vertical_layout.addItem(spacer_item_2)
self.horizontal_layout.addLayout(self.vertical_layout)
spacer_item_3 = QtWidgets.QSpacerItem(128, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
self.horizontal_layout.addItem(spacer_item_3)
self.window.setCentralWidget(self.central_widget)
self.menubar = QtWidgets.QMenuBar(self.window)
self.menubar.setGeometry(QtCore.QRect(0, 0, 1054, 21))
self.menubar.setObjectName("menubar")
self.window.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(self.window)
self.statusbar.setObjectName("statusbar")
self.window.setStatusBar(self.statusbar)
self.retranslate_ui(self.window)
QtCore.QMetaObject.connectSlotsByName(self.window)
def retranslate_ui(self, window):
_translate = QtCore.QCoreApplication.translate
window.setWindowTitle(_translate("Utterance Recording", "Test"))
self.label_utterance.setText(_translate("Utterance Recording", "Test"))
self.line_edit_message_for_user.setText(_translate("Utterance Recording", "Test."))
self.text_edit_utterance.setText(_translate("utterance_parsing", ('Test')))
self.push_button_start_recording.setText(_translate("Utterance Recording", "Start Recording"))
self.push_button_end_recording.setText(_translate("Utterance Recording", "End Recording"))
self.label_status.setText(_translate("Utterance Recording", "Test"))
self.push_button_record_again.setText(_translate("Utterance Recording", "Test"))
self.push_button_next_utterance.setText(_translate("Utterance Recording", "Test"))
def inside_thread(self):
percentage = 0
while percentage < 120:
percentage = percentage + 20
time.sleep(0.2)
self.progressBar.setValue(percentage)
def start_button_func(self):
self.worker = thread_for_audio_record.Worker(self.inside_thread)
self.threadpool.start(self.worker)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
utterance_parsing_window = QtWidgets.QMainWindow()
utterance_parsing = FW()
utterance_parsing.f_w(utterance_parsing_window)
utterance_parsing_window.show()
sys.exit(app.exec_())
thread_for_audio_record.py
import os
from PyQt5.QtCore import *
class Worker(QRunnable):
def __init__(self, fn):
super(Worker, self).__init__()
self.fn = fn
self.originating_PID = os.getpid()
self._running = True
@pyqtSlot()
def run(self):
self.fn()
单击开始录制
按钮,您将看到进度条正在更新。但给出警告消息是因为更新来自不同的线程。
最佳答案
首先,不要按照 PyQt 的建议修改 Qt Designer 生成的代码,而是创建另一个从适当的小部件继承的类,并使用初始类作为接口(interface)。
言归正传,Qt 不允许直接从另一个线程更新 GUI,在您的情况下,在辅助线程中调用 QProgressBar 的 setValue 导致在 secuandario 线程中进行绘制,因此 Qt 提示说它不能保证操作(例如,在您的情况下,它显然不会产生问题,但 Qt 不保证这种情况总是发生)。来自其他线程的 GUI 更新必须是间接的,可以通过信号、QEvent、QMetaObject::invokeMethod 等。在本例中我将使用信号:
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
import thread_for_audio_record
import time
class FW(object):
def f_w(self, window):
self.window = window
self.window.setObjectName("Test")
self.window.resize(1054, 700)
self.window.setStyleSheet("background-color: rgb(180, 180, 180);")
self.central_widget = QtWidgets.QWidget(self.window)
self.central_widget.setObjectName("centralwidget")
self.horizontal_layout = QtWidgets.QHBoxLayout(self.central_widget)
self.horizontal_layout.setObjectName("horizontalLayout")
spacer_item = QtWidgets.QSpacerItem(129, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
self.horizontal_layout.addItem(spacer_item)
self.vertical_layout = QtWidgets.QVBoxLayout()
self.vertical_layout.setObjectName("verticalLayout")
spacer_item_1 = QtWidgets.QSpacerItem(128, 13, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
self.vertical_layout.addItem(spacer_item_1)
self.label_utterance = QtWidgets.QLabel(self.central_widget)
font = QtGui.QFont()
font.setPointSize(15)
font.setBold(True)
font.setBold(True)
font.setWeight(75)
self.label_utterance.setFont(font)
self.label_utterance.setAlignment(QtCore.Qt.AlignCenter)
self.label_utterance.setObjectName("label_utterance")
self.vertical_layout.addWidget(self.label_utterance)
self.text_edit_utterance = QtWidgets.QTextEdit(self.central_widget)
self.text_edit_utterance.setStyleSheet("background-color: rgb(255, 255, 255);")
self.text_edit_utterance.setObjectName("text_edit_utterance")
self.text_edit_utterance.setReadOnly(True)
self.text_edit_utterance.setFont(font)
self.vertical_layout.addWidget(self.text_edit_utterance)
self.line_edit_message_for_user = QtWidgets.QLineEdit(self.central_widget)
self.line_edit_message_for_user.setStyleSheet("background-color: rgb(255, 255, 255);")
self.line_edit_message_for_user.setObjectName("lineEdit")
self.progressBar = QtWidgets.QProgressBar(self.central_widget)
self.progressBar.setProperty("value", 0)
self.progressBar.setObjectName("progressBar")
self.vertical_layout.addWidget(self.progressBar)
self.vertical_layout.addWidget(self.line_edit_message_for_user)
self.push_button_start_recording = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_start_recording.setFont(font)
self.push_button_start_recording.setStyleSheet("background-color: rgb(85, 170, 0);")
self.push_button_start_recording.setObjectName("pushButton_start_ recording")
self.vertical_layout.addWidget(self.push_button_start_recording)
self.push_button_end_recording = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_end_recording.setFont(font)
self.push_button_end_recording.setStyleSheet("background-color: rgb(182, 0, 0);")
self.push_button_end_recording.setObjectName("pushButton_end_recording")
self.vertical_layout.addWidget(self.push_button_end_recording)
self.label_status = QtWidgets.QLabel(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.label_status.setFont(font)
self.label_status.setObjectName("label_status")
self.vertical_layout.addWidget(self.label_status)
self.text_edit_status = QtWidgets.QTextEdit(self.central_widget)
self.text_edit_status.setStyleSheet("background-color: rgb(255, 255, 255);")
self.text_edit_status.setObjectName("textEdit_status")
self.text_edit_status.setReadOnly(True)
self.vertical_layout.addWidget(self.text_edit_status)
self.push_button_record_again = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_record_again.setFont(font)
self.push_button_record_again.setStyleSheet("background-color: rgb(255, 255, 127);")
self.push_button_record_again.setObjectName("pushButton_record_again")
self.vertical_layout.addWidget(self.push_button_record_again)
self.push_button_next_utterance = QtWidgets.QPushButton(self.central_widget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.push_button_next_utterance.setFont(font)
self.push_button_next_utterance.setStyleSheet("background-color: rgb(85, 170, 0);")
self.push_button_next_utterance.setObjectName("pushButton_next_utterance")
self.vertical_layout.addWidget(self.push_button_next_utterance)
spacer_item_2 = QtWidgets.QSpacerItem(128, 13, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
self.vertical_layout.addItem(spacer_item_2)
self.horizontal_layout.addLayout(self.vertical_layout)
spacer_item_3 = QtWidgets.QSpacerItem(128, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
self.horizontal_layout.addItem(spacer_item_3)
self.window.setCentralWidget(self.central_widget)
self.menubar = QtWidgets.QMenuBar(self.window)
self.menubar.setGeometry(QtCore.QRect(0, 0, 1054, 21))
self.menubar.setObjectName("menubar")
self.window.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(self.window)
self.statusbar.setObjectName("statusbar")
self.window.setStatusBar(self.statusbar)
self.retranslate_ui(self.window)
QtCore.QMetaObject.connectSlotsByName(self.window)
def retranslate_ui(self, window):
_translate = QtCore.QCoreApplication.translate
window.setWindowTitle(_translate("Utterance Recording", "Altran Audio Manager"))
self.label_utterance.setText(_translate("Utterance Recording", "Test"))
self.line_edit_message_for_user.setText(_translate("Utterance Recording", "Test."))
self.text_edit_utterance.setText(_translate("utterance_parsing", ('Test')))
self.push_button_start_recording.setText(_translate("Utterance Recording", "Start Recording"))
self.push_button_end_recording.setText(_translate("Utterance Recording", "End Recording"))
self.label_status.setText(_translate("Utterance Recording", "Test"))
self.push_button_record_again.setText(_translate("Utterance Recording", "Test"))
self.push_button_next_utterance.setText(_translate("Utterance Recording", "Test"))
class MainWindow(QtWidgets.QMainWindow, FW):
progressChanged = QtCore.pyqtSignal(int)
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.threadpool = QtCore.QThreadPool()
self.f_w(self)
self.push_button_start_recording.clicked.connect(self.start_button_func)
self.progressChanged.connect(self.progressBar.setValue)
def inside_thread(self):
percentage = 0
while percentage < 120:
percentage = percentage + 20
time.sleep(0.2)
self.progressChanged.emit(percentage)
def start_button_func(self):
self.worker = thread_for_audio_record.Worker(self.inside_thread)
self.threadpool.start(self.worker)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
关于python - QObject::setParent:无法设置父级,新父级位于Python中的不同线程中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55257343/
我通过 spring ioc 编写了一些 Rest 应用程序。但我无法解决这个问题。这是我的异常(exception): org.springframework.beans.factory.BeanC
我对 TestNG、Spring 框架等完全陌生,我正在尝试使用注释 @Value通过 @Configuration 访问配置文件注释。 我在这里想要实现的目标是让控制台从配置文件中写出“hi”,通过
为此工作了几个小时。我完全被难住了。 这是 CS113 的实验室。 如果用户在程序(二进制计算器)结束时选择继续,我们需要使用 goto 语句来到达程序的顶部。 但是,我们还需要释放所有分配的内存。
我正在尝试使用 ffmpeg 库构建一个小的 C 程序。但是我什至无法使用 avformat_open_input() 打开音频文件设置检查错误代码的函数后,我得到以下输出: Error code:
使用 Spring Initializer 创建一个简单的 Spring boot。我只在可用选项下选择 DevTools。 创建项目后,无需对其进行任何更改,即可正常运行程序。 现在,当我尝试在项目
所以我只是在 Mac OS X 中通过 brew 安装了 qt。但是它无法链接它。当我尝试运行 brew link qt 或 brew link --overwrite qt 我得到以下信息: ton
我在提交和 pull 时遇到了问题:在提交的 IDE 中,我看到: warning not all local changes may be shown due to an error: unable
我跑 man gcc | grep "-L" 我明白了 Usage: grep [OPTION]... PATTERN [FILE]... Try `grep --help' for more inf
我有一段代码,旨在接收任何 URL 并将其从网络上撕下来。到目前为止,它运行良好,直到有人给了它这个 URL: http://www.aspensurgical.com/static/images/a
在过去的 5 个小时里,我一直在尝试在我的服务器上设置 WireGuard,但在完成所有设置后,我无法 ping IP 或解析域。 下面是服务器配置 [Interface] Address = 10.
我正在尝试在 GitLab 中 fork 我的一个私有(private)项目,但是当我按下 fork 按钮时,我会收到以下信息: No available namespaces to fork the
我这里遇到了一些问题。我是 node.js 和 Rest API 的新手,但我正在尝试自学。我制作了 REST API,使用 MongoDB 与我的数据库进行通信,我使用 Postman 来测试我的路
下面的代码在控制台中给出以下消息: Uncaught DOMException: Failed to execute 'appendChild' on 'Node': The new child el
我正在尝试调用一个新端点来显示数据,我意识到在上一组有效的数据中,它在数据周围用一对额外的“[]”括号进行控制台,我认为这就是问题是,而新端点不会以我使用数据的方式产生它! 这是 NgFor 失败的原
我正在尝试将我的 Symfony2 应用程序部署到我的 Azure Web 应用程序,但遇到了一些麻烦。 推送到远程时,我在终端中收到以下消息 remote: Updating branch 'mas
Minikube已启动并正在运行,没有任何错误,但是我无法 curl IP。我在这里遵循:https://docs.traefik.io/user-guide/kubernetes/,似乎没有提到关闭
每当我尝试docker组成任何项目时,都会出现以下错误。 我尝试过有和没有sudo 我在这台机器上只有这个问题。我可以在Mac和Amazon WorkSpace上运行相同的容器。 (myslabs)
我正在尝试 pip install stanza 并收到此消息: ERROR: No matching distribution found for torch>=1.3.0 (from stanza
DNS 解析看起来不错,但我无法 ping 我的服务。可能是什么原因? 来自集群中的另一个 Pod: $ ping backend PING backend.default.svc.cluster.l
我正在使用Hibernate 4 + Spring MVC 4当我开始 Apache Tomcat Server 8我收到此错误: Error creating bean with name 'wel
我是一名优秀的程序员,十分优秀!