python GUI库图形界面开发之PyQt5中QWebEngineView内嵌网页与Python的数据交互传参详细方法实例

 /**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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 

 import sys import Web_UI from PyQt5 import QtCore, QtGui, QtWidgets from PyQt5.QtCore import QObject,pyqtProperty from PyQt5.QtWebChannel import QWebChannel from MySharedObject import MySharedObject from PyQt5.QtWidgets import QApplication import os BASE_DIR = os.path.dirname(__file__)#获取当前文件夹的绝对路径 if __name__ == '__main__': app = QtWidgets.QApplication(sys.argv) MainWindow = QtWidgets.QFrame() ui = Web_UI.Ui_Form() ui.setupUi(MainWindow) ui.webView1.load(QtCore.QUrl(r""+BASE_DIR+"/JSTest.html")) channel = QWebChannel() ##创建一个QwebChannel对象，用于传递PyQt的参数到JavaScript myObj = MySharedObject() print(myObj.strval) channel.registerObject('bridge', myObj) ui.webView1.page().setWebChannel(channel) MainWindow.show() sys.exit(app.exec_())

 from PyQt5.QtCore import QObject from PyQt5.QtCore import pyqtProperty from PyQt5.QtWidgets import QWidget,QMessageBox class MySharedObject(QWidget): def __init__(self,strval = '100'): super(MySharedObject,self).__init__() self.strval = strval def _getStrValue(self): return self.strval def _setStrValue(self,str): self.strval = str print('获得页面参数：%s'% str) QMessageBox.information(self,"Infomation", '获得的页面参数%s' % str) #需要定义的对外发布的方法 strValue= pyqtProperty(str,_getStrValue,_setStrValue)

    
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