html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<body><div><button id="p" onclick="btprint()">打印</button> # 点击按钮调用btprint()函数</div>
</body>
<script src="./js/qwebchannel.js"></script> # 引用通讯的js文件
<script>document.addEventListener("DOMContentLoaded", function () {new QWebChannel(qt.webChannelTransport, function (channel) {window.connection = channel.objects.connection; // 核心 绑定python的函数alert('通信管道加载完成')});});function btprint() {window.connection.test('8989'); // 调用python的test函数;}</script>
</html>
qwebchannel.js
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:BSD$
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**
****************************************************************************/"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 directlychannel.send(data);return;}if (channel.execId === Number.MAX_VALUE) {// wrapchannel.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 objectsfor (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 emissionthis.__objectSignals__ = {};// Cache of all properties, updated when a notify signal is emittedthis.__propertyCache__ = {};var object = this;// ----------------------------------------------------------------------this.unwrapQObject = function(response){if (response instanceof Array) {// support list of objectsvar 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-40021var 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 propertiesqObject.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 signalwebChannel.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 propertyUpdatewebChannel.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 cachefor (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];elseargs.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 yetobject.__propertyCache__[propertyIndex] = propertyInfo[3];if (notifySignalData) {if (notifySignalData[0] === 1) {// signal name is optimized away, reconstruct the actual namenotifySignalData[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 happenconsole.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};
}
文件结构如下
python代码
class MyWindow(QMainWindow):def __init__(self):super(MyWindow, self).__init__()self.channel = QWebChannel()self.channel.registerObject('connection', self) # 注册js连接对象self.browser = QWebEngineView(self) self.browser.page().setWebChannel(self.channel) # 将通讯管道添加到js中self.browser.load(QUrl.fromLocalFile("index.html")) # 本地h5# 连接到加载完成信号self.browser.loadFinished.connect(self.on_load_finished)def on_load_finished(self, success):print("页面加载完成", success)@pyqtSlot(str)def test(self, data): # 供js调用的函数print('1222', data)app = QApplication(sys.argv)main_window.tray()main_window.show()sys.exit(app.exec_())
参考:
https://blog.csdn.net/syealfalfa/article/details/135926921?spm=1001.2014.3001.5506
https://www.cnblogs.com/leokale-zz/p/13141751.html
预览文件并功能
# coding=utf-8# @Time : 2024-09-25 17:48
# @Author : XiaoYi
# @Email: 1206154726@qq.com
import fitz
from PyQt5.QtCore import Qt, QUrl, QObject, pyqtSlot
from PyQt5.QtGui import QIcon, QImage, QPainter
from PyQt5.QtPrintSupport import QPrinter, QPrintDialog, QPageSetupDialog, QPrintPreviewDialog
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWidgets import QMainWindow, QSystemTrayIcon, QMenu, QAction, \QApplicationfrom settings import LOGO_PATH, INDEX_FILE, INI_PATH
from tools import MyINIFileclass MyWindow(QMainWindow):def __init__(self):config = MyINIFile(INI_PATH)self.open_loadfile = config.read_value('Section1', 'open_loadfile')self._window_title = config.read_value('Section1', 'window_title') # 窗口标题self._window_width = int(config.read_value('Section1', 'window_width'))# 窗口默认宽高self._window_height = int(config.read_value('Section1', 'window_height')) # 窗口默认宽高self.prohibit_max_window = config.read_value('Section1', 'prohibit_max_window') # 是否禁止最大化self.window_max = config.read_value('Section1', 'window_max') # 是否默认最大化显示self.open_url = config.read_value('Section1', 'open_url') # 网络链接self._min_window_width = int(config.read_value('Section1', 'min_window_width')) # 最小窗口self._min_window_height = int(config.read_value('Section1', 'min_window_height'))super(MyWindow, self).__init__()self.setWindowTitle(self._window_title) # 设置窗口标题self.setMinimumSize(self._min_window_width, self._min_window_height)self.resize(self._window_width, self._window_height)self.setWindowIcon(QIcon(LOGO_PATH)) # 设置窗口图标，icon.png 是您的图标文件路径self.channel = QWebChannel()self.channel.registerObject('connection', self)self.browser = QWebEngineView(self) # 如果不写self则新生成一个窗口self.browser.page().setWebChannel(self.channel)if self.prohibit_max_window == '1':self.setWindowFlags(self.windowFlags() & ~Qt.WindowMaximizeButtonHint) # 禁止最大化按钮if self.window_max == '1':self.showMaximized() # 最大化窗口if self.open_loadfile == '1':self.browser.load(QUrl.fromLocalFile(INDEX_FILE)) # 本地h5else:self.browser.setUrl(QUrl(self.open_url)) ## 连接到加载完成信号# self.browser.loadFinished.connect(self.on_load_finished)# def on_load_finished(self, success):# print("页面加载完成", success)@pyqtSlot(str)def print_page(self, d1): # js调用的函数printer = QPrinter(QPrinter.HighResolution) # # 高分辨率：选择 QPrinter.HighResolutionpreview_dialog = QPrintPreviewDialog(printer, self) # 打印预览框preview_dialog.paintRequested.connect(lambda printer: self.print_pdf(printer)) # 在预览框选择打印时的函数preview_dialog.exec_()def print_pdf(self, printer):pdf_path = r"C:\Users\Yi\Desktop\1.pdf" # 替换为你的PDF文件路径pdf_document = fitz.open(pdf_path) # PyMuPDFpainter = QPainter(printer)num_pages = len(pdf_document)for i in range(num_pages):pdf_page = pdf_document.load_page(i)pix = pdf_page.get_pixmap() # 获取原图像尺寸img_width = pix.widthimg_height = pix.heightprinter.setPageSize(QPrinter.A4) # 计算打印的缩放比例scale_x = printer.pageRect().width() / img_widthscale_y = printer.pageRect().height() / img_heightscale = min(scale_x, scale_y)img = pix.tobytes("png") # 绘制页面painter.drawImage(0, 0, QImage.fromData(img).scaled(img_width * scale, img_height * scale))if i < num_pages - 1: # 换页printer.newPage()painter.end()def resizeEvent(self, event):# 设置 WebEngineView 的大小self.browser.resize(self.size()) # 使用窗口的大小super().resizeEvent(event)def tray(self):'''系统托盘'''# 创建系统托盘图标self.tray_icon = QSystemTrayIcon(self)self.tray_icon.setIcon(QIcon(LOGO_PATH)) # 替换为你的图标路径self.tray_icon.setToolTip(self._window_title) # 这里设置鼠标悬浮时显示的文字self.tray_menu = QMenu() # 创建右键菜单open_window_action = QAction("打开主界面", self) # 添加退出动作exit_action = QAction("退出系统", self) # 添加退出动作self.tray_menu.addAction(open_window_action) # 添加到菜单self.tray_menu.addAction(exit_action)open_window_action.triggered.connect(self.open_window_action)exit_action.triggered.connect(self.exit_app) # 连接托盘图标的点击事件self.tray_icon.activated.connect(self.tray_icon_clicked) # 图标左键被点击self.tray_icon.setContextMenu(self.tray_menu) # 将菜单设置到托盘图标self.tray_icon.show() # 显示托盘图标def tray_icon_clicked(self, reason):if reason == QSystemTrayIcon.Trigger: # 单击托盘图标if self.isHidden():self.show() # 显示窗口if self.isMinimized():self.showNormal() # 还原窗口self.activateWindow() # 激活窗口self.raise_() # 确保窗口在最上层def open_window_action(self):'''打开主界面'''if self.isHidden():self.show() # 显示窗口if self.isMinimized():self.showNormal() # 还原窗口self.activateWindow() # 激活窗口self.raise_() # 确保窗口在最上层def exit_app(self):QApplication.quit() # 退出应用def closeEvent(self, event):'''窗口被关闭事件'''event.ignore()self.hide()
