前言
几天前写了一个备份的小工具，用Python写个脚本，也就花个一天的时间搞定，给客户用了一下，对功能很满意，但对界面不满足，想要一个图形界面来管理；
一个备份脚本，有必要整成这样子吗？没办法，谁让是上帝的要求呢，就研究一下；先后找了python的tkinter、pyqt，尝试着画一些界面，虽然功能可以实现，但界面很难看；恰好，在查看pyqt的API文档的时候 ，发现了QWebView组件，据介绍可以实现一个浏览器，并且浏览器中的JS可以与Python代码进行交互。忽然眼前一亮，我不正是我想要的吗！
抽几天时间把工具写完了，目前运行良好；想写篇博客做个记录，也想给需要进行此类开发的朋友做个示例，就把这个工具最核心的内容做了一个DEMO。现在，就把这个小DEMO的开发过程做个说明；
功能简介
这个小DEMO用于显示计算机上的一些信息，显示内容不是主要的，主要为了体现如何用python+HTML开发桌面应用程序。
1.使用HTML开发一个界面； 2.在页面上显示主机信息； 3.实现功能时，体现JS调用Python和Python调用JS；
最终实现的主界面如下：
准备材料
开发工具：Visual Studio Code
开发语言：python 2.7/python 3.7
界面工具包：PyQT4/PyQT5
目录结构
说明：
demoUI.py : python主体程序 ，主要实现窗口创建，加载index.html页面，python与JS的交互；
views/index.html : 主要进行数据展示，及与python交互的js程序
demoUI.py开发
引入的包
from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4 import QtWebKit
from PyQt4 import QtNetwork
#处理中文问题
import sys,json
from PyQt4.Qt import QObject
reload(sys)
sys.setdefaultencoding('utf8')
前四行代码，主要是引入Qt相关的包，这里使用的PyQt4；
后三行代码，主要是为了处理中文问题，可以忽略，但遇到中文乱码的时候，想起来这句话，把它加上就行了
DemoWin类
class DemoWin(QtWebKit.QWebView):
def __init__(self):
QtWebKit.QWebView.__init__(self)
self.resize(800, 600)
self.setUrl(QtCore.QUrl('views/index.html'))
self.show()
mainFrame = self.page().mainFrame()
winobj = WinObj(mainFrame)
mainFrame.javaScriptWindowObjectCleared.connect(lambda: mainFrame.addToJavaScriptWindowObject(QtCore.QString('WinObj'), winobj))
DemoWin是整个应用的核心类，主要实现窗体创建，关联与JS交互的槽函数等；
class DemoWin(QtWebKit.QWebView):
像标题所说，我们将使用WebKit作为页面展示，所以这里的主页面是以QtWebKit.QWebView作为基类
QtWebKit.QWebView.init(self) self.resize(800, 600) self.setUrl(QtCore.QUrl(‘views/index.html’)) self.show()
设置窗口大小为800*600，并且加载index.html进行显示
mainFrame = self.page().mainFrame()
获取网页主框架，按照QT官方文档解释：QWebFrame代表一个网页框架，每一个QWebFrame至少包含一个主框架，使用QWebFrame.mainFrame()获取。
这是进行后续各类操作的基础，类似于JS中只有获取到网页的dom对象，才可以对其中的元素操作一样；
winobj = WinObj(mainFrame) mainFrame.javaScriptWindowObjectCleared.connect(lambda: mainFrame.addToJavaScriptWindowObject(QtCore.QString(‘WinObj’), winobj)) ##js调用python
这段代码是关键中的关键！
WinObj类：是封装后用于js调用的槽函数类，后续再详细介绍
addToJavaScriptWindowObject类：第一个参数是对象在javascript里的名字， 可以自由命名， 第二个参数是对应的QObject实例指针。 这样在javascript里就可以直接访问WinObj对象拉, 是不是看上去超级简单？但是这个函数的调用时机是有讲究的，按照官方文档的推荐，是需要在javaScriptWindowObjectCleared信号的槽里调用，才有了以上的代码；里面用了lambda表达式，纯粹是为了减少一个槽函数的定义，你如果觉得不好看或不喜欢，完全可以定义一个槽函数；
WinObj类
下面来重点介绍WinObj类，类型定义如下：
class WinObj(QtCore.QObject):
def __init__(self,mainFrame):
super(WinObj,self).__init__()
self.mainFrame = mainFrame
@QtCore.pyqtSlot(result="QString")
def getInfo(self):
import socket,platform
hostname = socket.gethostname()
try:
ip = socket.gethostbyname(hostname)
except:
ip = ''
list_info = platform.uname()
sys_name = list_info[0] + list_info[2]
cpu_name = list_info[5]
dic_info = {"hostname":hostname,"ip":ip,"sys_name":sys_name, \
"cpu_name":cpu_name}
#调用js函数，实现回调
self.mainFrame.evaluateJavaScript('%s(%s)' % ('onGetInfo',json.dumps(dic_info)))
return json.dumps(dic_info)
该类封装了JS可直接调用的方法，有一些区别于普通类的地方要注意；
class WinObj(QtCore.QObject):
该类必须继承自QObject，而不能是object。
def __init__(self,mainFrame):
super(WinObj,self).__init__()
self.mainFrame = mainFrame
构造函数将mainFrame传进来，主要用于调用js函数（后面将有示例介绍）
@QtCore.pyqtSlot(result="QString")
def getInfo(self):
import socket,platform
hostname = socket.gethostname()
ip = socket.gethostbyname(hostname)
list_info = platform.uname()
sys_name = list_info[0] + list_info[2]
cpu_name = list_info[5]
dic_info = {"hostname":hostname,"ip":ip,"sys_name":sys_name, \
"cpu_name":cpu_name}
#调用js函数，实现回调
self.mainFrame.evaluateJavaScript('%s(%s)' % ('onGetInfo',json.dumps(dic_info)))
return json.dumps(dic_info)
getInfo()实现了一个供JS调用的方法，有几下几点要注意：
（1）@QtCore.pyqtSlot(result=”QString”) 用于将python方法转换为供js用的函数，括号里写明数据类型及返回类型；如果没有声明result，则不能返回数据；
（2）self.mainFrame.evaluateJavaScript(‘%s(%s)’ % (‘onGetInfo’,json.dumps(dic_info)))
调用页面中用JS声明的onGetInfo函数（这里仅作一个示例，将查询到的数据进行回调返回）
demoUI.py完整代码下：
#coding=utf-8
'''
Created on 2017年11月3日
@author: Administrator
'''
from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4 import QtWebKit
from PyQt4 import QtNetwork
#处理中文问题
import sys,json
from PyQt4.Qt import QObject
reload(sys)
sys.setdefaultencoding('utf8')
class DemoWin(QtWebKit.QWebView):
def __init__(self):
QtWebKit.QWebView.__init__(self)
self.resize(800, 600)
self.setUrl(QtCore.QUrl('views/index.html'))
self.show()
mainFrame = self.page().mainFrame()
winobj = WinObj(mainFrame)
mainFrame.javaScriptWindowObjectCleared.connect(lambda: mainFrame.addToJavaScriptWindowObject(QtCore.QString('WinObj'), winobj)) ##js调用python
class WinObj(QtCore.QObject):
def __init__(self,mainFrame):
super(WinObj,self).__init__()
self.mainFrame = mainFrame
@QtCore.pyqtSlot(result="QString")
def getInfo(self):
import socket,platform
hostname = socket.gethostname()
try:
ip = socket.gethostbyname(hostname)
except:
ip = ''
list_info = platform.uname()
sys_name = list_info[0] + list_info[2]
cpu_name = list_info[5]
dic_info = {"hostname":hostname,"ip":ip,"sys_name":sys_name, \
"cpu_name":cpu_name}
#调用js函数，实现回调
self.mainFrame.evaluateJavaScript('%s(%s)' % ('onGetInfo',json.dumps(dic_info)))
return json.dumps(dic_info)
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
demoWin = DemoWin()
sys.exit(app.exec_())
index.html
<!DOCTYPE script PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src='http://www.mobibrw.com/wp-content/uploads/2020/05/vue.min_.1.0.11.js'></script>
</head>
<body>
<div id='app'>
<input type='button' onclick='getInfo()' value="获取机器信息">
<H3 >主机名：{{config.hostname}} </H3>
<H3 >IP：{{config.ip}} </H3>
<H3 >操作系统：{{config.sys_name}} </H3>
<H3 >CPU：{{config.cpu_name}} </H3>
<H3>以下为python回调信息：</H3>
<label id='info'></label>
</div>
</body>
</html>
<script type="text/javascript">
var vm = new Vue({
el: '#app',
data:{
config:{}
},
created:function(){
this.config = JSON.parse(window.WinObj.getInfo())
}
});
function getInfo() {
info = JSON.parse(window.WinObj.getInfo())
alert(info)
}
//python回调的js函数
function onGetInfo(info) {
document.getElementById('info').innerText=JSON.stringify(info)
}
</script>
Python 3.7/PyQT5下需要安装 pyQt5
$ python3 -m pip install --upgrade pip $ pip3 install SIP $ pip3 install pyQt5 $ pip3 install --upgrade PyQt5 $ pip3 install PyQtWebEngine
Python 3.7/PyQT5下的代码(注意，Python 2.7/PyQT4是的交互是同步调用的，但是Python 3.7/PyQT5通过QtWebChannel交互是异步的)如下:
#coding=utf-8
from PyQt5 import QtCore
from PyQt5 import QtGui
from PyQt5 import QtWidgets
from PyQt5 import QtWebEngineWidgets
from PyQt5 import QtNetwork
from PyQt5 import QtWebChannel
#处理中文问题
import sys,json
from PyQt5.Qt import QObject
#reload(sys)
#sys.setdefaultencoding('utf8')
# 调试窗口配置
# 如果不想自己创建调试窗口，可以使用Chrome连接这个地址进行调试
import os
DEBUG_PORT = '5588'
DEBUG_URL = 'http://127.0.0.1:%s' % DEBUG_PORT
os.environ['QTWEBENGINE_REMOTE_DEBUGGING'] = DEBUG_PORT
def qt_message_handler(mode, context, message):
if mode == QtCore.QtInfoMsg:
mode = 'INFO'
elif mode == QtCore.QtWarningMsg:
mode = 'WARNING'
elif mode == QtCore.QtCriticalMsg:
mode = 'CRITICAL'
elif mode == QtCore.QtFatalMsg:
mode = 'FATAL'
else:
mode = 'DEBUG'
print('qt_message_handler: line: %d, func: %s(), file: %s' % (
context.line, context.function, context.file))
print(' %s: %s\n' % (mode, message))
QtCore.qInstallMessageHandler(qt_message_handler)
class DemoWin(QtWebEngineWidgets.QWebEngineView):
def __init__(self):
QtWebEngineWidgets.QWebEngineView.__init__(self)
self.setWindowTitle('Web页面中的JavaScript与 QWebEngineView交互例子')
self.resize(800, 600)
self.settings().setAttribute(QtWebEngineWidgets.QWebEngineSettings.PluginsEnabled, True)
self.settings().setAttribute(QtWebEngineWidgets.QWebEngineSettings.JavascriptEnabled, True)
url = QtCore.QUrl('file:///' + QtCore.QFileInfo('views/index.html').absoluteFilePath())
#url = QtCore.QUrl("https://www.baidu.com")
self.setUrl(url)
self.show()
self.winobj = WinObj(self.page())
self.channel = QtWebChannel.QWebChannel()
self.channel.registerObject("con", self.winobj)
self.page().setWebChannel(self.channel)
#网页调试窗口
self.inspector = QtWebEngineWidgets.QWebEngineView()
self.inspector.setWindowTitle('Web Inspector')
self.inspector.load(QtCore.QUrl(DEBUG_URL))
self.loadFinished.connect(self.handleHtmlLoaded)
def handleHtmlLoaded(self, ok):
if ok:
self.page().setDevToolsPage(self.inspector.page())
self.inspector.show()
class WinObj(QtCore.QObject):
def __init__(self, page):
super(WinObj,self).__init__()
self.page = page
@QtCore.pyqtSlot(result="QString")
def getInfo(self):
import socket,platform
hostname = socket.gethostname()
try:
ip = socket.gethostbyname(hostname)
except:
ip = ''
list_info = platform.uname()
sys_name = list_info[0] + list_info[2]
cpu_name = list_info[5]
dic_info = {"hostname":hostname,"ip":ip,"sys_name":sys_name, \
"cpu_name":cpu_name}
#调用js函数，实现回调
self.page.runJavaScript('%s(%s)' % ('onGetInfo',json.dumps(dic_info)))
js = json.dumps(dic_info)
return js
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
demoWin = DemoWin()
sys.exit(app.exec())
index.html
<!DOCTYPE script PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src="qwebchannel.js"></script>
<script type="text/javascript" src='http://www.mobibrw.com/wp-content/uploads/2020/05/vue.min_.1.0.11.js'></script>
</head>
<body>
<div id='app'>
<input type='button' onclick='getInfo()' value="获取机器信息">
<H3 >主机名：{{config.hostname}} </H3>
<H3 >IP：{{config.ip}} </H3>
<H3 >操作系统：{{config.sys_name}} </H3>
<H3 >CPU：{{config.cpu_name}} </H3>
<H3>以下为python回调信息：</H3>
<label id='info'></label>
</div>
</body>
</html>
<script type="text/javascript">
new QWebChannel( qt.webChannelTransport, function(channel) {
window.con = channel.objects.con;
window.vm = new Vue({
el: '#app',
data: {
config:{}
},
created:function() {
window.con.getInfo(function(info) {
window.vm.config = JSON.parse(info);
});
}
});
});
function getInfo() {
window.con.getInfo();
}
//python回调的js函数
function onGetInfo(info) {
document.getElementById('info').innerText=JSON.stringify(info)
}
</script>
/****************************************************************************
**
** 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
};
}
参考链接
- Python+WebKit+HTML开发桌面应用程序
- pyqt5加载网页的简单使用
- Porting from Qt WebKit to Qt WebEngine
- PyQt5 QWebChannel实现python与Javascript双向通信
- Qt的QWebChannel和JS、HTML通信/交互驱动百度地图
- qwebchannel.js Example File
- PyQt5高级界面控件之QWebEngineView(十三)
- QWebEngineView加载本地html三种方法
- Redirect qDebug output to file with PyQt5
- 基于 QWebChannel 的前端通信方案
- qwebengineview与js相互调用（js调用c++部分）
- PyQt - JavaScript 交互
- Qt WebChannel Examples
- What is the alternative to QWebInspector in Qt WebEngine?