如何为escpos协议构建angular和node js？

Question

sorry for my english. I have angular front-end, node js server, thermal printer. I had to communicate with thermal printers from angular using esc/pos protocol, so I made a node js server. Now I do a request from angular to node and then node communicates with the printer (using ip and port). How can I build angular and node together? So when I deploy it I don't have to start node server every time? Thanks

Answer 1

I suppose you are refering to run it locally. There are several ways:

1. In windows 10, for example, you can run a nodejs "server" like a window service. So it runs on startup. (take a look at this repo Forever tool )
2. You can use electron js: first of all generate your build of Angular project: ng b --prod : this will generate the dist folder with your index.html and necessary scripts.Now you can serve this static folder from your node js script: for example, with the help of Express js .

 var express = require("express"); var app = express(); app.use(express.static("/dist/myAngularProject")); //Add your escpos logic, ecc.. app.listen(3001, function () { console.log("Server listening on port 3001;"); });

Now if you run the comand: node index.js , you should see your angular app. The next step is very simple: start a new Electron js application, and in your main.js load your server URL:

 const { app, BrowserWindow } = require('electron') require("./server/myNodeJsServerIndex.js") let win function createWindow () { win = new BrowserWindow({ width: 950, height: 750, fullscreen: true, webPreferences: { nodeIntegration: true, devTools:false } }) //my node js server win.loadURL(`http://localhost:3001`); win.on('closed', () => { win = null }) } app.on('ready', createWindow) app.on('window-all-closed', () => { if (process.platform.== 'darwin') { app.quit() } }) app,on('activate', () => { if (win === null) { createWindow() } })

With require("./server/myNodeJsServerIndex.js") and win.loadURL( http://localhost:3001 ); , it means that every time that you start the electron client, your nodejs server will start automatically.