kd-aiot
/
print-utils-desktop


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111
							import { printRecordService } from './database/PrintRecordService'
import { getMainWindow } from 'ee-core/electron/window'
import { logger } from 'ee-core/log'
import { BrowserWindow } from 'electron'
import {Event} from '../utils/Event'
import {PrintEvent} from "../event/PrintEvent";
import {Channel} from "../channel/Channel";
import {PrintTaskQueue} from "../utils/PrintTaskQueue";
import {randomUUID} from "node:crypto";
/**
 * 打印服务
 */
class PrintService {
    private static queue = new PrintTaskQueue()
    constructor() {
    }

    _init() {
        Event.on(PrintEvent.PRINT_DATA, async (res) => {
            if (res instanceof Array) {
                for (let print of res) {
                    PrintService.queue.enqueue({taskId: randomUUID(), data: print})
                }
            }
        })
        this.printLoop()
    }

    printLoop() {
        new Promise(async (resolve, reject) => {
            try {
                while (!PrintService.queue.isEmpty()) {
                    getMainWindow().webContents.send(Channel.PRINT_TASK_LIST, PrintService.queue.list())
                    const task = PrintService.queue.dequeue()
                    if (task) {
                        // @ts-ignore
                        await this.printData(task.data)
                    }
                    await new Promise(resolve2 => setTimeout(resolve2, 1000))
                    resolve(true)
                }
            } catch (e) {
                logger.error('print loop ex ---> ', e)
                reject(e)
            }
        }).then((res: any) => {
            logger.info("print then --->", res)
        }).catch((e: any) => {
            logger.error('print catch ex ---> ', e)
        })
    }

    /**
     * 获取本地打印机列表
     */
    async listLocalPrinters(): Promise<Electron.PrinterInfo[]> {
        return getMainWindow().webContents.getPrintersAsync();
    }

    async printData(data: any) {
        return new Promise(async (resolve, reject) => {
            getMainWindow().webContents.send(Channel.PRINT_START)
            const printWindow = new BrowserWindow({ show: false });
            const printData = `<html><body>${data.html}</body></html>`
            getMainWindow().webContents.send(Channel.PRINT_DATA, printData)
            await printWindow.loadURL(`data:text/html, ${printData}`);
            printWindow.webContents.on('did-finish-load', () => {
                getMainWindow().webContents.send(Channel.PRINT_PROGRESS)
                printWindow.webContents.print({
                    silent: true,
                    printBackground: true,
                    deviceName: data.deviceName ,
                    margins:data.margins||{
                        marginType :'none'
                    },
                    landscape:data.landscape||false,
                    copies:data.copies||1,
                    dpi:data.dpi,
                    header:data.header,
                    footer:data.footer,
                    pageSize:data.pageSize //A4,Legal | {height:}
                }, (success: boolean, failureReason: string) => {
                    logger.info('打印结果：', success, failureReason)
                    getMainWindow().webContents.send(Channel.PRINT_RESULT, {
                        success,
                        failureReason
                    })
                    printRecordService.add({
                        printerName: data.deviceName,
                        printHtml: data.html,
                        printStatus: success ? 'success' : 'failure',
                        failureReason: failureReason
                    })
                    if (success) {
                        resolve(true)
                    }else {
                        reject(failureReason)
                    }
                    printWindow.close();
                }); // 静默打印
            });
        })
    }

}
PrintService.toString = () => '[class PrintService]'
const printService = new PrintService()
export {
    PrintService,
    printService
}