main.js

/*
Author : Kingsley Amankwa
COMPANY: NirdTeq
*/
const {app, BrowserWindow , ipcMain} = require('electron')
const path = require('path')

// requiring elctron pos printer
// const { PosPrinter } = remote.require("electron-pos-printer"); used in renderer.js
const {PosPrinter} = require("electron-pos-printer");


// Enable live reload for Electron too
require('electron-reload')(__dirname, {
    // Note that the path to electron may vary according to the main file
    electron: require(`${__dirname}/node_modules/electron`)
});

function createWindow () {
  // Create the browser window.
  const mainWindow = new BrowserWindow({
    minWidth: 950,
    minHeight: 730,
    frame: true,
      show: false,
//      backgroundColor: '#20b2aa',
    webPreferences: {
      // preload: path.join(__dirname, 'preload.js'),
      nodeIntegration: true
    },
    // enableRemoteModule: true
  });


     // waits for program to load visual before showing
   mainWindow.once('ready-to-show', () =>{
       mainWindow.show();
   });
  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
   mainWindow.webContents.openDevTools();

}

//disable default window menu globally
app.on('browser-window-created',function(event,window) {
  window.setMenu(null);
})
// 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()

  app.on('activate', function () {
    // 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()
  })
})

// 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', function () {
  if (process.platform !== 'darwin') app.quit()
})


ipcMain.on('print', (event, arg) => {
   const printerData = JSON.parse(arg);
   console.log('printerName');
   PosPrinter.print(printerData.data, {
   preview: false,
   width: '300',
   margin: '0 0 0 0',
   border: 1,
   copies: 1,
   printerName: printerData.printerName,
   timeOutPerLine: 400,
   silent: true
   // pageSize: { height: 301000, width: 71000 } // page size
    }).catch(error => console.error(error));
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.
// You can use console.log(notification); to see more available properties