Why is the connection always wrong

[TheBestLL]

v-print="'#printContent'" is work but use electron-pos-printer is not work => [TimedOutError] Make sure your printer is connected

I tried multiple device names "{ name: 'EPSON_TM_T82III_S_C', displayName: 'TM-T82III-S/C', description: 'EPSON TM-T82-S/C'}" but never succeeded

'use strict'

import { app, protocol, BrowserWindow, screen, Menu, ipcMain } from 'electron' import { PosPrinter } from 'electron-pos-printer' import { createProtocol } from 'vue-cli-plugin-electron-builder/lib' import installExtension, { VUEJS_DEVTOOLS } from 'electron-devtools-installer' const isDevelopment = process.env.NODE_ENV !== 'production'

Menu.setApplicationMenu(null)

// Scheme must be registered before the app is ready protocol.registerSchemesAsPrivileged([ { scheme: 'app', privileges: { secure: true, standard: true } } ]) let win=null

async function createWindow() { // Create the browser window. let size = screen.getPrimaryDisplay().workAreaSize let width = parseInt(size.width) let height = parseInt(size.height)

win = new BrowserWindow({ width: width, height: height, webPreferences: { webviewTag: true, // 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, contextIsolation: !process.env.ELECTRON_NODE_INTEGRATION } })

if (process.env.WEBPACK_DEV_SERVER_URL) { // Load the url of the dev server if in development mode await 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('app://./index.html') } }

// 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 (BrowserWindow.getAllWindows().length === 0) createWindow() })

// 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.on('ready', async () => { if (isDevelopment && !process.env.IS_TEST) { // Install Vue Devtools try { await installExtension(VUEJS_DEVTOOLS) } catch (e) { console.error('Vue Devtools failed to install:', e.toString()) } } createWindow() })

ipcMain.on("printer", (e, arg) => {

console.log("##### printer") // console.log(e,arg) console.log(win.webContents.getPrinters())

const options = { preview: false, // Preview in window or print width: '20px', // width of content body margin: '0 0 0 0', // margin of content body copies: 1, // Number of copies to print // deviceName: "TM-T82III-S/C", // printerName:"TM-T82III-S/C", // printerName: string, check with webContent.getPrinters() timeOutPerLine: 5000, pathTemplate:"pos.html", silent: true, pageSize: { height: 301000, width: 71000 } // page size } const data = [ { type: 'text', // 'text' | 'barCode' | 'qrCode' | 'image' | 'table value: 'SAMPLE HEADING', style: text-align:center;, css: {"font-weight": "700", "font-size": "18px"} } ]

PosPrinter.print(data, options).then(() => { console.log("#打印成功") }).catch((error) => { console.error("错误 error"+error); }); })

// Exit cleanly on request from parent process in development mode. if (isDevelopment) { if (process.platform === 'win32') { process.on('message', (data) => { if (data === 'graceful-exit') { app.quit() } }) } else { process.on('SIGTERM', () => { app.quit() }) } }