pyqt5的 QWebEngineView 和 QWebChannel问题 启动后 有概率闪退 显示内存错误
还有可能正常启动 但点按钮 在创建一个窗口时闪退 也是内存错误 不显示任何错误信息 有代码
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtCore import QUrl, QObject, pyqtSlot
import sys
class CreatWindow(QMainWindow):
def __init__(self):
super().__init__()
self.webview = QWebEngineView(self)
self.setCentralWidget(self.webview)
def dragEnterEvent(self, event):
if event.mimeData().hasUrls():
event.acceptProposedAction()
else:
super().dragEnterEvent(event)
class Backend(QObject):
def __init__(self, view):
super(Backend, self).__init__()
self.view = view
@pyqtSlot(str, result=str)
def test(self, value):
return "test"
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.initUI()
self.windows = [] # 存储所有窗口的列表
def initUI(self):
self.button = QPushButton('Open new window', self)
self.button.clicked.connect(self.open_new_window)
self.setCentralWidget(self.button)
def open_new_window(self):
new_window = CreatWindow()
new_window.webview.load(QUrl.fromLocalFile("/index.html"))
backend = Backend(new_window.webview)
channel = QWebChannel(new_window.webview.page())
channel.registerObject('backend', backend)
new_window.webview.page().setWebChannel(channel)
# 当页面加载完成后，注入JavaScript代码
new_window.webview.loadFinished.connect(lambda: self.inject_js(new_window))
self.windows.append(new_window) # 将新窗口添加到列表中
new_window.show() # 显示新窗口
def inject_js(self, window):
def test(r):
print("返回值>", r)
def inject_custom_js(result):
print("注入js")
js_code = """
new QWebChannel(qt.webChannelTransport, function (channel) {
window.myObject = channel.objects.backend;
alert('Connected to Python');
});
var btn = document.createElement('button');
btn.style.position = 'absolute';
btn.style.left = '0px';
btn.style.top = '0px';
btn.style.zIndex = '99999';
btn.textContent = 'New Button';
btn.onclick = function() {
window.myObject.test('Button clicked!');
};
document.body.appendChild(btn);
"""
window.webview.page().runJavaScript(js_code, test)
# 读取本地文件
with open("qwebchannel.js", "r", encoding="utf-8") as f:
js_code = f.read()
window.webview.page().runJavaScript(js_code, inject_custom_js)
app = QApplication(sys.argv)
main = MainWindow()
main.show()
sys.exit(app.exec_())
qwebchannel.js
//qwebchannel.js下载
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebChannel module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
"use strict";
var QWebChannelMessageTypes = {
signal: 1,
propertyUpdate: 2,
init: 3,
idle: 4,
debug: 5,
invokeMethod: 6,
connectToSignal: 7,
disconnectFromSignal: 8,
setProperty: 9,
response: 10,
};
var QWebChannel = function(transport, initCallback)
{
if (typeof transport !== "object" || typeof transport.send !== "function") {
console.error("The QWebChannel expects a transport object with a send function and onmessage callback property." +
" Given is: transport: " + typeof(transport) + ", transport.send: " + typeof(transport.send));
return;
}
var channel = this;
this.transport = transport;
this.send = function(data)
{
if (typeof(data) !== "string") {
data = JSON.stringify(data);
}
channel.transport.send(data);
}
this.transport.onmessage = function(message)
{
var data = message.data;
if (typeof data === "string") {
data = JSON.parse(data);
}
switch (data.type) {
case QWebChannelMessageTypes.signal:
channel.handleSignal(data);
break;
case QWebChannelMessageTypes.response:
channel.handleResponse(data);
break;
case QWebChannelMessageTypes.propertyUpdate:
channel.handlePropertyUpdate(data);
break;
default:
console.error("invalid message received:", message.data);
break;
}
}
this.execCallbacks = {};
this.execId = 0;
this.exec = function(data, callback)
{
if (!callback) {
// if no callback is given, send directly
channel.send(data);
return;
}
if (channel.execId === Number.MAX_VALUE) {
// wrap
channel.execId = Number.MIN_VALUE;
}
if (data.hasOwnProperty("id")) {
console.error("Cannot exec message with property id: " + JSON.stringify(data));
return;
}
data.id = channel.execId++;
channel.execCallbacks[data.id] = callback;
channel.send(data);
};
this.objects = {};
this.handleSignal = function(message)
{
var object = channel.objects[message.object];
if (object) {
object.signalEmitted(message.signal, message.args);
} else {
console.warn("Unhandled signal: " + message.object + "::" + message.signal);
}
}
this.handleResponse = function(message)
{
if (!message.hasOwnProperty("id")) {
console.error("Invalid response message received: ", JSON.stringify(message));
return;
}
channel.execCallbacks[message.id](message.data);
delete channel.execCallbacks[message.id];
}
this.handlePropertyUpdate = function(message)
{
for (var i in message.data) {
var data = message.data[i];
var object = channel.objects[data.object];
if (object) {
object.propertyUpdate(data.signals, data.properties);
} else {
console.warn("Unhandled property update: " + data.object + "::" + data.signal);
}
}
channel.exec({type: QWebChannelMessageTypes.idle});
}
this.debug = function(message)
{
channel.send({type: QWebChannelMessageTypes.debug, data: message});
};
channel.exec({type: QWebChannelMessageTypes.init}, function(data) {
for (var objectName in data) {
var object = new QObject(objectName, data[objectName], channel);
}
// now unwrap properties, which might reference other registered objects
for (var objectName in channel.objects) {
channel.objects[objectName].unwrapProperties();
}
if (initCallback) {
initCallback(channel);
}
channel.exec({type: QWebChannelMessageTypes.idle});
});
};
function QObject(name, data, webChannel)
{
this.__id__ = name;
webChannel.objects[name] = this;
// List of callbacks that get invoked upon signal emission
this.__objectSignals__ = {};
// Cache of all properties, updated when a notify signal is emitted
this.__propertyCache__ = {};
var object = this;
// ----------------------------------------------------------------------
this.unwrapQObject = function(response)
{
if (response instanceof Array) {
// support list of objects
var ret = new Array(response.length);
for (var i = 0; i < response.length; ++i) {
ret[i] = object.unwrapQObject(response[i]);
}
return ret;
}
if (!response
|| !response["__QObject*__"]
|| response.id === undefined) {
return response;
}
var objectId = response.id;
if (webChannel.objects[objectId])
return webChannel.objects[objectId];
if (!response.data) {
console.error("Cannot unwrap unknown QObject " + objectId + " without data.");
return;
}
var qObject = new QObject( objectId, response.data, webChannel );
qObject.destroyed.connect(function() {
if (webChannel.objects[objectId] === qObject) {
delete webChannel.objects[objectId];
// reset the now deleted QObject to an empty {} object
// just assigning {} though would not have the desired effect, but the
// below also ensures all external references will see the empty map
// NOTE: this detour is necessary to workaround QTBUG-40021
var propertyNames = [];
for (var propertyName in qObject) {
propertyNames.push(propertyName);
}
for (var idx in propertyNames) {
delete qObject[propertyNames[idx]];
}
}
});
// here we are already initialized, and thus must directly unwrap the properties
qObject.unwrapProperties();
return qObject;
}
this.unwrapProperties = function()
{
for (var propertyIdx in object.__propertyCache__) {
object.__propertyCache__[propertyIdx] = object.unwrapQObject(object.__propertyCache__[propertyIdx]);
}
}
function addSignal(signalData, isPropertyNotifySignal)
{
var signalName = signalData[0];
var signalIndex = signalData[1];
object[signalName] = {
connect: function(callback) {
if (typeof(callback) !== "function") {
console.error("Bad callback given to connect to signal " + signalName);
return;
}
object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
object.__objectSignals__[signalIndex].push(callback);
if (!isPropertyNotifySignal && signalName !== "destroyed") {
// only required for "pure" signals, handled separately for properties in propertyUpdate
// also note that we always get notified about the destroyed signal
webChannel.exec({
type: QWebChannelMessageTypes.connectToSignal,
object: object.__id__,
signal: signalIndex
});
}
},
disconnect: function(callback) {
if (typeof(callback) !== "function") {
console.error("Bad callback given to disconnect from signal " + signalName);
return;
}
object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
var idx = object.__objectSignals__[signalIndex].indexOf(callback);
if (idx === -1) {
console.error("Cannot find connection of signal " + signalName + " to " + callback.name);
return;
}
object.__objectSignals__[signalIndex].splice(idx, 1);
if (!isPropertyNotifySignal && object.__objectSignals__[signalIndex].length === 0) {
// only required for "pure" signals, handled separately for properties in propertyUpdate
webChannel.exec({
type: QWebChannelMessageTypes.disconnectFromSignal,
object: object.__id__,
signal: signalIndex
});
}
}
};
}
/**
* Invokes all callbacks for the given signalname. Also works for property notify callbacks.
*/
function invokeSignalCallbacks(signalName, signalArgs)
{
var connections = object.__objectSignals__[signalName];
if (connections) {
connections.forEach(function(callback) {
callback.apply(callback, signalArgs);
});
}
}
this.propertyUpdate = function(signals, propertyMap)
{
// update property cache
for (var propertyIndex in propertyMap) {
var propertyValue = propertyMap[propertyIndex];
object.__propertyCache__[propertyIndex] = propertyValue;
}
for (var signalName in signals) {
// Invoke all callbacks, as signalEmitted() does not. This ensures the
// property cache is updated before the callbacks are invoked.
invokeSignalCallbacks(signalName, signals[signalName]);
}
}
this.signalEmitted = function(signalName, signalArgs)
{
invokeSignalCallbacks(signalName, signalArgs);
}
function addMethod(methodData)
{
var methodName = methodData[0];
var methodIdx = methodData[1];
object[methodName] = function() {
var args = [];
var callback;
for (var i = 0; i < arguments.length; ++i) {
if (typeof arguments[i] === "function")
callback = arguments[i];
else
args.push(arguments[i]);
}
webChannel.exec({
"type": QWebChannelMessageTypes.invokeMethod,
"object": object.__id__,
"method": methodIdx,
"args": args
}, function(response) {
if (response !== undefined) {
var result = object.unwrapQObject(response);
if (callback) {
(callback)(result);
}
}
});
};
}
function bindGetterSetter(propertyInfo)
{
var propertyIndex = propertyInfo[0];
var propertyName = propertyInfo[1];
var notifySignalData = propertyInfo[2];
// initialize property cache with current value
// NOTE: if this is an object, it is not directly unwrapped as it might
// reference other QObject that we do not know yet
object.__propertyCache__[propertyIndex] = propertyInfo[3];
if (notifySignalData) {
if (notifySignalData[0] === 1) {
// signal name is optimized away, reconstruct the actual name
notifySignalData[0] = propertyName + "Changed";
}
addSignal(notifySignalData, true);
}
Object.defineProperty(object, propertyName, {
configurable: true,
get: function () {
var propertyValue = object.__propertyCache__[propertyIndex];
if (propertyValue === undefined) {
// This shouldn't happen
console.warn("Undefined value in property cache for property \"" + propertyName + "\" in object " + object.__id__);
}
return propertyValue;
},
set: function(value) {
if (value === undefined) {
console.warn("Property setter for " + propertyName + " called with undefined value!");
return;
}
object.__propertyCache__[propertyIndex] = value;
webChannel.exec({
"type": QWebChannelMessageTypes.setProperty,
"object": object.__id__,
"property": propertyIndex,
"value": value
});
}
});
}
// ----------------------------------------------------------------------
data.methods.forEach(addMethod);
data.properties.forEach(bindGetterSetter);
data.signals.forEach(function(signal) { addSignal(signal, false); });
for (var name in data.enums) {
object[name] = data.enums[name];
}
}
//required for use with nodejs
if (typeof module === 'object') {
module.exports = {
QWebChannel: QWebChannel
};
}
【以下回答由 GPT 生成】
首先，根据您提供的代码，我没有找到明显的内存错误或闪退的原因。但是，我注意到一个潜在的问题是在打开新窗口的时候没有正确地设置窗口的大小。另外，我还建议您在出现错误时使用try-except语句来捕捉异常并打印出错误信息，以便更好地调试。以下是我对代码的一些改进建议：
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtCore import QUrl, QObject, pyqtSlot
import sys
class CustomWindow(QMainWindow):
def __init__(self):
super().__init__()
self.webview = QWebEngineView(self)
self.setCentralWidget(self.webview)
def dragEnterEvent(self, event):
if event.mimeData().hasUrls():
event.acceptProposedAction()
else:
super().dragEnterEvent(event)
class Backend(QObject):
def __init__(self, view):
super(Backend, self).__init__()
self.view = view
@pyqtSlot(str, result=str)
def test(self, value):
return "test"
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.initUI()
self.windows = [] # 存储所有窗口的列表
def initUI(self):
self.button = QPushButton('Open new window', self)
self.button.clicked.connect(self.open_new_window)
self.setCentralWidget(self.button)
def open_new_window(self):
try:
new_window = CustomWindow()
new_window.resize(800, 600) # 设置窗口大小
new_window.webview.load(QUrl.fromLocalFile("/index.html"))
backend = Backend(new_window.webview)
channel = QWebChannel(new_window.webview.page())
channel.registerObject('backend', backend)
new_window.webview.page().setWebChannel(channel)
# 当页面加载完成后，注入JavaScript代码
new_window.webview.loadFinished.connect(lambda: self.inject_js(new_window))
self.windows.append(new_window) # 将新窗口添加到列表中
new_window.show() # 显示新窗口
except Exception as e:
print("An error occurred:", str(e))
def inject_js(self, window):
# 在页面加载完成后，注入JavaScript代码
# 这里可以添加需要执行的JavaScript代码
pass
if __name__ == '__main__':
app = QApplication(sys.argv)
main_window = MainWindow()
main_window.resize(800, 600) # 设置主窗口大小
main_window.show()
sys.exit(app.exec_())
请注意，这些改进建议可能无法完全解决内存错误和闪退问题，因为这些问题可能与您的系统环境或其他因素有关。因此，如果问题仍然存在，请提供更多的错误信息或尝试在其他计算机上运行代码。
【相关推荐】
//qwebchannel.js下载
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebChannel module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
"use strict";
var QWebChannelMessageTypes = {
signal: 1,
propertyUpdate: 2,
init: 3,
idle: 4,
debug: 5,
invokeMethod: 6,
connectToSignal: 7,
disconnectFromSignal: 8,
setProperty: 9,
response: 10,
};
var QWebChannel = function(transport, initCallback)
{
if (typeof transport !== "object" || typeof transport.send !== "function") {
console.error("The QWebChannel expects a transport object with a send function and onmessage callback property." +
" Given is: transport: " + typeof(transport) + ", transport.send: " + typeof(transport.send));
return;
}
var channel = this;
this.transport = transport;
this.send = function(data)
{
if (typeof(data) !== "string") {
data = JSON.stringify(data);
}
channel.transport.send(data);
}
this.transport.onmessage = function(message)
{
var data = message.data;
if (typeof data === "string") {
data = JSON.parse(data);
}
switch (data.type) {
case QWebChannelMessageTypes.signal:
channel.handleSignal(data);
break;
case QWebChannelMessageTypes.response:
channel.handleResponse(data);
break;
case QWebChannelMessageTypes.propertyUpdate:
channel.handlePropertyUpdate(data);
break;
default:
console.error("invalid message received:", message.data);
break;
}
}
this.execCallbacks = {};
this.execId = 0;
this.exec = function(data, callback)
{
if (!callback) {
// if no callback is given, send directly
channel.send(data);
return;
}
if (channel.execId === Number.MAX_VALUE) {
// wrap
channel.execId = Number.MIN_VALUE;
}
if (data.hasOwnProperty("id")) {
console.error("Cannot exec message with property id: " + JSON.stringify(data));
return;
}
data.id = channel.execId++;
channel.execCallbacks[data.id] = callback;
channel.send(data);
};
this.objects = {};
this.handleSignal = function(message)
{
var object = channel.objects[message.object];
if (object) {
object.signalEmitted(message.signal, message.args);
} else {
console.warn("Unhandled signal: " + message.object + "::" + message.signal);
}
}
this.handleResponse = function(message)
{
if (!message.hasOwnProperty("id")) {
console.error("Invalid response message received: ", JSON.stringify(message));
return;
}
channel.execCallbacks[message.id](message.data);
delete channel.execCallbacks[message.id];
}
this.handlePropertyUpdate = function(message)
{
for (var i in message.data) {
var data = message.data[i];
var object = channel.objects[data.object];
if (object) {
object.propertyUpdate(data.signals, data.properties);
} else {
console.warn("Unhandled property update: " + data.object + "::" + data.signal);
}
}
channel.exec({type: QWebChannelMessageTypes.idle});
}
this.debug = function(message)
{
channel.send({type: QWebChannelMessageTypes.debug, data: message});
};
channel.exec({type: QWebChannelMessageTypes.init}, function(data) {
for (var objectName in data) {
var object = new QObject(objectName, data[objectName], channel);
}
// now unwrap properties, which might reference other registered objects
for (var objectName in channel.objects) {
channel.objects[objectName].unwrapProperties();
}
if (initCallback) {
initCallback(channel);
}
channel.exec({type: QWebChannelMessageTypes.idle});
});
};
function QObject(name, data, webChannel)
{
this.__id__ = name;
webChannel.objects[name] = this;
// List of callbacks that get invoked upon signal emission
this.__objectSignals__ = {};
// Cache of all properties, updated when a notify signal is emitted
this.__propertyCache__ = {};
var object = this;
// ----------------------------------------------------------------------
this.unwrapQObject = function(response)
{
if (response instanceof Array) {
// support list of objects
var ret = new Array(response.length);
for (var i = 0; i < response.length; ++i) {
ret[i] = object.unwrapQObject(response[i]);
}
return ret;
}
if (!response
|| !response["__QObject*__"]
|| response.id === undefined) {
return response;
}
var objectId = response.id;
if (webChannel.objects[objectId])
return webChannel.objects[objectId];
if (!response.data) {
console.error("Cannot unwrap unknown QObject " + objectId + " without data.");
return;
}
var qObject = new QObject( objectId, response.data, webChannel );
qObject.destroyed.connect(function() {
if (webChannel.objects[objectId] === qObject) {
delete webChannel.objects[objectId];
// reset the now deleted QObject to an empty {} object
// just assigning {} though would not have the desired effect, but the
// below also ensures all external references will see the empty map
// NOTE: this detour is necessary to workaround QTBUG-40021
var propertyNames = [];
for (var propertyName in qObject) {
propertyNames.push(propertyName);
}
for (var idx in propertyNames) {
delete qObject[propertyNames[idx]];
}
}
});
// here we are already initialized, and thus must directly unwrap the properties
qObject.unwrapProperties();
return qObject;
}
this.unwrapProperties = function()
{
for (var propertyIdx in object.__propertyCache__) {
object.__propertyCache__[propertyIdx] = object.unwrapQObject(object.__propertyCache__[propertyIdx]);
}
}
function addSignal(signalData, isPropertyNotifySignal)
{
var signalName = signalData[0];
var signalIndex = signalData[1];
object[signalName] = {
connect: function(callback) {
if (typeof(callback) !== "function") {
console.error("Bad callback given to connect to signal " + signalName);
return;
}
object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
object.__objectSignals__[signalIndex].push(callback);
if (!isPropertyNotifySignal && signalName !== "destroyed") {
// only required for "pure" signals, handled separately for properties in propertyUpdate
// also note that we always get notified about the destroyed signal
webChannel.exec({
type: QWebChannelMessageTypes.connectToSignal,
object: object.__id__,
signal: signalIndex
});
}
},
disconnect: function(callback) {
if (typeof(callback) !== "function") {
console.error("Bad callback given to disconnect from signal " + signalName);
return;
}
object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
var idx = object.__objectSignals__[signalIndex].indexOf(callback);
if (idx === -1) {
console.error("Cannot find connection of signal " + signalName + " to " + callback.name);
return;
}
object.__objectSignals__[signalIndex].splice(idx, 1);
if (!isPropertyNotifySignal && object.__objectSignals__[signalIndex].length === 0) {
// only required for "pure" signals, handled separately for properties in propertyUpdate
webChannel.exec({
type: QWebChannelMessageTypes.disconnectFromSignal,
object: object.__id__,
signal: signalIndex
});
}
}
};
}
/**
* Invokes all callbacks for the given signalname. Also works for property notify callbacks.
*/
function invokeSignalCallbacks(signalName, signalArgs)
{
var connections = object.__objectSignals__[signalName];
if (connections) {
connections.forEach(function(callback) {
callback.apply(callback, signalArgs);
});
}
}
this.propertyUpdate = function(signals, propertyMap)
{
// update property cache
for (var propertyIndex in propertyMap) {
var propertyValue = propertyMap[propertyIndex];
object.__propertyCache__[propertyIndex] = propertyValue;
}
for (var signalName in signals) {
// Invoke all callbacks, as signalEmitted() does not. This ensures the
// property cache is updated before the callbacks are invoked.
invokeSignalCallbacks(signalName, signals[signalName]);
}
}
this.signalEmitted = function(signalName, signalArgs)
{
invokeSignalCallbacks(signalName, signalArgs);
}
function addMethod(methodData)
{
var methodName = methodData[0];
var methodIdx = methodData[1];
object[methodName] = function() {
var args = [];
var callback;
for (var i = 0; i < arguments.length; ++i) {
if (typeof arguments[i] === "function")
callback = arguments[i];
else
args.push(arguments[i]);
}
webChannel.exec({
"type": QWebChannelMessageTypes.invokeMethod,
"object": object.__id__,
"method": methodIdx,
"args": args
}, function(response) {
if (response !== undefined) {
var result = object.unwrapQObject(response);
if (callback) {
(callback)(result);
}
}
});
};
}
function bindGetterSetter(propertyInfo)
{
var propertyIndex = propertyInfo[0];
var propertyName = propertyInfo[1];
var notifySignalData = propertyInfo[2];
// initialize property cache with current value
// NOTE: if this is an object, it is not directly unwrapped as it might
// reference other QObject that we do not know yet
object.__propertyCache__[propertyIndex] = propertyInfo[3];
if (notifySignalData) {
if (notifySignalData[0] === 1) {
// signal name is optimized away, reconstruct the actual name
notifySignalData[0] = propertyName + "Changed";
}
addSignal(notifySignalData, true);
}
Object.defineProperty(object, propertyName, {
configurable: true,
get: function () {
var propertyValue = object.__propertyCache__[propertyIndex];
if (propertyValue === undefined) {
// This shouldn't happen
console.warn("Undefined value in property cache for property \"" + propertyName + "\" in object " + object.__id__);
}
return propertyValue;
},
set: function(value) {
if (value === undefined) {
console.warn("Property setter for " + propertyName + " called with undefined value!");
return;
}
object.__propertyCache__[propertyIndex] = value;
webChannel.exec({
"type": QWebChannelMessageTypes.setProperty,
"object": object.__id__,
"property": propertyIndex,
"value": value
});
}
});
}
// ----------------------------------------------------------------------
data.methods.forEach(addMethod);
data.properties.forEach(bindGetterSetter);
data.signals.forEach(function(signal) { addSignal(signal, false); });
for (var name in data.enums) {
object[name] = data.enums[name];
}
}
//required for use with nodejs
if (typeof module === 'object') {
module.exports = {
QWebChannel: QWebChannel
};
}
看一下这个代码
援引通义千问：
这个代码是一个使用PyQt5的QWebEngineView和QWebChannel的示例。但是，您在启动后有概率闪退，显示内存错误，这可能是由于以下原因：
QWebEngineView加载页面时，可能会出现内存泄漏。您可以尝试在页面加载完成后，调用webview.page().setWebChannel(QWebChannel())，将QWebChannel对象注入到页面中，以减少内存泄漏。
在注入JavaScript代码时，可能会出现内存泄漏。您可以尝试在注入JavaScript代码后，调用webview.page().runJavaScript()，将JavaScript代码注入到页面中，以减少内存泄漏。
在注入JavaScript代码时，可能会出现页面闪退的问题。您可以尝试在注入JavaScript代码前，调用webview.page().runJavaScript()，将JavaScript代码注入到页面中，以减少页面闪退的问题。
希望以上建议能够帮助您解决问题。如果您需要更多帮助，请随时告诉我。
修改后的代码试试
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtCore import QUrl, QObject, pyqtSlot, pyqtSignal
import sys
class CreatWindow(QMainWindow):
def __init__(self):
super().__init__()
self.webview = QWebEngineView(self)
self.setCentralWidget(self.webview)
class Backend(QObject):
def __init__(self, view):
super(Backend, self).__init__()
self.view = view
@pyqtSlot(str, result=str)
def test(self, value):
return "test"
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.initUI()
self.windows = [] # 存储所有窗口的列表
def initUI(self):
self.button = QPushButton('Open new window', self)
self.button.clicked.connect(self.open_new_window)
self.setCentralWidget(self.button)
def open_new_window(self):
new_window = CreatWindow()
new_window.webview.load(QUrl.fromLocalFile("index.html"))
backend = Backend(new_window.webview)
channel = QWebChannel(new_window.webview.page())
channel.registerObject('backend', backend)
new_window.webview.page().setWebChannel(channel)
# 当页面加载完成后，注入JavaScript代码
new_window.webview.loadFinished.connect(lambda: self.inject_js(new_window))
self.windows.append(new_window) # 将新窗口添加到列表中
new_window.show() # 显示新窗口
def inject_js(self, window):
def test(r):
print("返回值>", r)
def inject_custom_js(result):
print("注入js")
js_code = """
new QWebChannel(qt.webChannelTransport, function (channel) {
window.myObject = channel.objects.backend;
alert('Connected to Python');
});
var btn = document.createElement('button');
btn.style.position = 'absolute';
btn.style.left = '0px';
btn.style.top = '0px';
btn.style.zIndex = '99999';
btn.textContent = 'New Button';
btn.onclick = function() {
window.myObject.test('Button clicked!');
};
document.body.appendChild(btn);
"""
try:
window.webview.page().runJavaScript(js_code, test)
except Exception as e:
print("JavaScript注入错误:", str(e))
# 读取本地文件
with open("qwebchannel.js", "r", encoding="utf-8") as f:
js_code = f.read()
try:
window.webview.page().runJavaScript(js_code, inject_custom_js)
except Exception as e:
print("JavaScript注入错误:", str(e))
app = QApplication(sys.argv)
main = MainWindow()
main.show()
sys.exit(app.exec_())
引用GPT部分内容回答：这种情况可能由于内存管理或资源释放不当引起。你可以尝试按照以下方式修改你的代码，看是否能解决问题：
open_new_window方法中，将new_window设置为成员变量，以便在后续使用时可以访问。new_window.close()或者手动释放资源。修改后的代码如下：
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtCore import QUrl, QObject, pyqtSlot
import sys
class CreatWindow(QMainWindow):
def __init__(self):
super().__init__()
self.webview = QWebEngineView(self)
self.setCentralWidget(self.webview)
class Backend(QObject):
def __init__(self, view):
super(Backend, self).__init__()
self.view = view
@pyqtSlot(str, result=str)
def test(self, value):
return "test"
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.initUI()
self.windows = [] # 存储所有窗口的列表
def initUI(self):
self.button = QPushButton('Open new window', self)
self.button.clicked.connect(self.open_new_window)
self.setCentralWidget(self.button)
def open_new_window(self):
new_window = CreatWindow()
new_window.setAttribute(QtCore.Qt.WA_DeleteOnClose) # 设置为在关闭时自动释放资源
new_window.webview.load(QUrl.fromLocalFile("/index.html"))
backend = Backend(new_window.webview)
channel = QWebChannel(new_window.webview.page())
channel.registerObject('backend', backend)
new_window.webview.page().setWebChannel(channel)
# 当页面加载完成后，注入JavaScript代码
new_window.webview.loadFinished.connect(lambda: self.inject_js(new_window))
self.windows.append(new_window) # 将新窗口添加到列表中
new_window.show() # 显示新窗口
def inject_js(self, window):
def test(r):
print("返回值>", r)
def inject_custom_js(result):
print("注入js")
js_code = """
new QWebChannel(qt.webChannelTransport, function (channel) {
window.myObject = channel.objects.backend;
alert('Connected to Python');
});
var btn = document.createElement('button');
btn.style.position = 'absolute';
btn.style.left = '0px';
btn.style.top = '0px';
btn.style.zIndex = '99999';
btn.textContent = 'New Button';
btn.onclick = function() {
window.myObject.test('Button clicked!');
};
document.body.appendChild(btn);
"""
window.webview.page().runJavaScript(js_code, test)
# 读取本地文件
with open("qwebchannel.js", "r", encoding="utf-8") as f:
js_code = f.read()
window.webview.page().runJavaScript(js_code, inject_custom_js)
app = QApplication(sys.argv)
main = MainWindow()
main.show()
sys.exit(app.exec_())
引用 皆我百晓生 小程序回复内容作答：
这段代码有两个问题可能导致闪退和内存错误：
在创建新窗口时，传递给QUrl.fromLocalFile()的文件路径不正确，应该提供正确的文件路径。如果index.html文件和Python脚本在同一目录下，可以使用QUrl.fromLocalFile("index.html")来加载。
注入JavaScript时，使用with open("qwebchannel.js", "r", encoding="utf-8") as f来打开脚本文件。如果qwebchannel.js文件和Python脚本在同一目录下，可以直接使用文件名加载脚本：window.webview.page().runJavaScript("qwebchannel.js", inject_custom_js)。
修复这两个问题后，代码应该可以正常运行，不会出现闪退和内存错误。