Require node-opcua in electron freezes the electron instance - javascript

Electron freezes when node-opcua is required in index.html and a process called Electron Helper takes up 100% of the cpu.
I have encountered the problem on macOS 10.14.2, but a friend tested in Windows 10 and that worked.
From package.json
"devDependencies": {
"electron": "^4.0.4"
},
"dependencies": {
"node-opcua": "^0.5.6"
}
Main.js
const { app, BrowserWindow } = require('electron')
function createWindow () {
// Create the browser window.
win = new BrowserWindow({ width: 800, height: 600 })
// and load the index.html of the app.
win.loadFile('index.html')
win.webContents.openDevTools()
}
app.on('ready', createWindow)
Index.html
<script>
// Does not work
const opcua = require('node-opcua')
console.log(opcua)
// Works
// const fs = require('fs')
// console.log(fs)
</script>
When running the simple code it should just print the opcua object in the console. But the complete electorn process freezes.

Solved it by updating node-opcua to 2.1.9 and electron to 6.0.11

Related

Can't open PDF files in Electron

I followed the suggestions in the answers of related questions, i.e. specifying
webPreferences: {
plugins: true
}
as part of the options when creating the BrowserWindow instance, but it is simply not working. Whenever I try to load/open/view a PDF file in electron, all I get is what looks like an empty/broken chromium PDF viewer like on this screenshot:
My electron version is "^13.1.2" according to my package.json and this is my main.js
// main.js
// Modules to control application life and create native browser window
const { app, BrowserWindow } = require('electron')
const path = require('path')
function createWindow () {
// Create the browser window.
const win = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
plugins: true
}
});
// and load the index.html of the app.
win.loadFile('test.pdf');
}
app.whenReady().then(() => {
createWindow()
})
app.on('window-all-closed', function () {
app.quit()
})
Can anyone tell me what I'm doing wrong?
An upgrade of electron helped me. i switched from 13.x to 16.x and it works now
Use PDFWindow package
`//main.js
app.on('ready', () => {
const win = new PDFWindow({
width: 800,
height: 600
})
win.loadURL('test.pdf')
})
//package.json
"dependencies": {
"electron-pdf-window": "^1.0.12",
},
`

Window does not render on build, works fine in development server

My app does not display a window when it's built, but works fine when I run npm run serve
There is still an process running in task manager, and the same thing happens if I use the installer. I don't get any errors warnings from electron-builder.
background.js:
import { app, protocol, dialog, BrowserWindow, ipcMain, shell } from 'electron'
import { createProtocol } from 'vue-cli-plugin-electron-builder/lib'
import installExtension, { VUEJS_DEVTOOLS } from 'electron-devtools-installer'
import path from 'path'
import fs from 'fs'
import childProcess from 'child_process'
import ncp from 'ncp'
const isDevelopment = process.env.NODE_ENV !== 'production'
// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let win
// Scheme must be registered before the app is ready
protocol.registerSchemesAsPrivileged([
{ scheme: 'app', privileges: { secure: true, standard: true } }
])
function createWindow () {
// Create the browser window.
win = new BrowserWindow({
width: 1200,
height: 600,
resizable: false,
maximizable: false,
frame: false,
webPreferences: {
// Use pluginOptions.nodeIntegration, leave this alone
// See nklayman.github.io/vue-cli-plugin-electron-builder/guide/security.html#node-integration for more info
nodeIntegration: process.env.ELECTRON_NODE_INTEGRATION,
preload: path.join(__dirname, 'preload.js')
}
})
if (process.env.WEBPACK_DEV_SERVER_URL) {
// Load the url of the dev server if in development mode
win.loadURL(process.env.WEBPACK_DEV_SERVER_URL)
if (!process.env.IS_TEST) win.webContents.openDevTools()
} else {
createProtocol('app')
// Load the index.html when not in development
win.loadURL(path.join(__dirname,'index.html'))
}
win.on('closed', () => {
win = null
})
}
// Quit when all windows are closed.
app.on('window-all-closed', () => {
// On macOS it is common for applications and their menu bar
// to stay active until the user quits explicitly with Cmd + Q
if (process.platform !== 'darwin') {
app.quit()
}
})
app.on('activate', () => {
// On macOS it's common to re-create a window in the app when the
// dock icon is clicked and there are no other windows open.
if (win === null) {
createWindow()
}
})
I tried the fixes here and here to no avail.
I'm using electron-vue. You can find the full code here if you need more context
The issue ended up being code present inside of the app.on('ready') function. Any additional code needs to be written after the window is created, or the issue occurs.

Electron app does not function properly after built into an exe file

I have just finished working on a test project in electron. The problem is that when I package the app using an electron-packager into an executable, my main.html file does not load up in the window.
However, when I run with npm start it works absolutely fine. I have checked if there is any mistake in the path to my files but that's absolutely fine as well.
Here's my package.json file -
{
"name": "test",
"version": "1.0.0",
"description": "Just a test app",
"main": "src/main.js",
"scripts": {
"start": "electron ."
},
"author": "Ray",
"license": "MIT",
"devDependencies": {
"electron": "^9.0.5"
},
"dependencies": {
"electron-packager": "^15.0.0"
}
}
Here is my main.js
const { app, BrowserWindow } = require('electron')
function createWindow () {
// Create the browser window.
const win = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
nodeIntegration: true
}
})
// and load the index.html of the app.
win.loadFile('./app/main.html')
}
// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.whenReady().then(createWindow)
// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', () => {
if (process.platform !== 'darwin') {
app.quit()
}
})
app.on('activate', () => {
// On macOS it's common to re-create a window in the app when the
// dock icon is clicked and there are no other windows open.
if (BrowserWindow.getAllWindows().length === 0) {
createWindow()
}
})
Any help will be appreciated. Thanks.
First of all electron-packagershould be part of devDependencies, not dependencies.
Second: How do you pack? If you use an asar File you need to look at the Paths. Those change when packing. So I'd recommend you use something like
win.loadURL(`file://${__dirname}/main.html`)
or
win.loadURL(url.format({
pathname: path.join(__dirname, 'main.html'),
protocol: 'file:',
slashes: true
}));
when loading your html.

How to properly package Electron + Angular-cli 9?

My question is because I have been seeing how to do it for a long time and the first few times it worked, but lately I have had many problems.
I have seen several Blogs on how to link Electron with Angular but it always happens to me that I have errors with the main.js in the loadURL
const { app, BrowserWindow } = require('electron');
const url = require("url");
const path = require("path");
let mainWindow;
function createWindow() {
mainWindow = new BrowserWindow({
width: 800,
height: 600,
title: 'frontend',
backgroundColor: '#ffffff',
webPreferences: {
nodeIntegration: true
}
});
mainWindow.maximize();
mainWindow.webContents.openDevTools();
mainWindow.loadURL(
url.format({
pathname: path.join(__dirname, `/dist/index.html`),
protocol: "file:",
slashes: true
})
);
mainWindow.on('closed', function () {
mainWindow = null
});
}
app.on('ready', createWindow);
app.on('window-all-closed', function () {
if (process.platform !== 'darwin') app.quit();
})
app.on('activate', function () {
if (mainWindow === null) createWindow();
})
I have already made the changes that videos and pages usually say about this as
Editing the package.json with "main": "main.js",
Put the dot in <base href ="./">
In angular.json projects> appName> architect> build> options> outputPath change it to "outputPath":"dist", without the project title
All of the above works until the time of packaging.
For what several mention using "electron-packager":"^14.2.1",
From a simpler command like
    "packager": "electron-packager. --platform = win32 --out dist / --overwrite"
Where first of all, it generates an error with pathname: path.join (__ dirname, 'dist / index.html'), because it locates it somewhere else and I have to change dist / for src /
What the exe generates but at the moment of starting only the <app-root> </app-root> tag appears without the angular scripts, that is, an empty page
And others post to create the package.json script like:
"electron-package": "ng build --prod && electron-packager. --no-prune --ignore=/node_modules --ignore=/e2e --ignore=/src --overwrite"
or
"electron-package": "ng build --prod --base-href ./ && electron-packager. --no-prune --ignore=/e2e --ignore=/src --overwrite"
That the latter I think does not generate the index.html: c
Does anyone know a Definitive process with Anglar-cli and Electron?

how to create exe package of angular electron app

I have developed an app in angular 6. I am trying to make .exe build using electron. When I am making an electron build in the dev environment which is working fine but now I want to release a package for windows I have installed electron packager on my machine trying to make a build for windows. I have installed wine on Linux machine to run the build. It is making the build of the app but when I run .exe file it displays me an empty window. I don't understand what the issue is & why it is displaying me an empty screen.
// main.ts
const { app, BrowserWindow } = require('electron')
const path = require('path');
let win;
function createWindow () {
win = new BrowserWindow({
width: 600,
height: 600,
backgroundColor: '#ffffff'
})
win.maximize()
win.loadURL(`file://${__dirname}/dist/task-reporting-tool/index.html`)
win.on('closed', function () {
win = null
})
}
app.on('ready', createWindow)
app.on('window-all-closed', function () {
if (process.platform !== 'darwin') {
app.quit()
}
})
app.on('activate', function () {
if (win === null) {
createWindow()
}
})
// package.json
"main": "main.js",
"description": "task-reporting-tool",
"files": [ "build", "*.js", "public"],
"scripts": {
"electron": "electron .",
"electron-build": "ng build --prod && electron .",
"packager": "electron-packager . WinApp --platform=win32 --arch=all"
}
index.html
<base href="./">
I have created a main.js file. done changes in the index.html file & in package.json.
Using npm run packager to make a build. All the required changes are done build successful but displays an empty screen.
Install npm and then try:
electron-packager . --asar
electron-packager . --all
You could try :
win.loadURL(
url.format({
pathname: path.join(__dirname, "/dist/angular-electron/index.html"),
protocol: "file:",
slashes: true
})
);

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