pc-component-v5/packages/print/src/PrintUtil.js

/**
 * node-red打印程序
 */

import Common from '../../common/Common.js';
import Uuid from '../../common/Uuid.js';


export default {
  webSocket: '',     // websocket对象

  socketUrl: 'ws://127.0.0.1:18800/api/ws/print',  //  websocket客户端地址

  /**
   * 获取所有的打印机
   */
  getPrinters: function () {
    var _self = this;
    var command = {
      id: Uuid.createUUID(),
      command: 'getPrinters',
      data: null,
    };
    var commandStr = JSON.stringify(command);
    return new Promise((resolve, reject) => {
      _self.connectNodeRed(resolve, reject, commandStr);
    });
  },

  /**
   * 打印条码程序
   * @param {调用的打印方法, 使用http请求头，举例：url = "http://127.0.0.1:8080/api/JobOrderResource/print} url 
   * @param {打印机名称, 取值"TOSHIBA" ,"GK888t","Zebra"} printerName 
   */
  print: function (url, printerName) {
    var _self = this;
    return new Promise((resolve, reject) => {
      $.ajax({
        type: 'get',
        url: url,
        beforeSend: function (request) {
          Common.addTokenToRequest(request);
        },
        success: function (data) {
          if (data && data.length > 0) {
            var printPagesStr = JSON.parse(data);
            _self.printPrintPages(printPagesStr, printerName);
          }
        },
        error: function (XMLHttpRequest, textStatus, errorThrown) {
          reject(XMLHttpRequest);
        },
      });
    });
  },

  /**
   * 打印机文件
   * @param {*} printPages 
   */
  printPrintPages: function(printPages, printerName){
    var _self = this;
    var commandData = {
      id: Uuid.createUUID(),
      command: 'print',
      printerName: printerName,
      data: printPages,
    };
    var commandStr = JSON.stringify(commandData);
    var promise = new Promise((resolve, reject) => {
      _self.connectNodeRed(resolve, reject, commandStr);
    });
    return promise;
  },


  /**
   * 打印机文件预览
   * @param {*} printPages 
   */
  printPreview: function(printPages, printerName){
    var _self = this;
    var commandData = {
      id: Uuid.createUUID(),
      command: 'printPreview',
      printerName: printerName,
      data: printPages,
    };
    var commandStr = JSON.stringify(commandData);
    var promise = new Promise((resolve, reject) => {
      _self.connectNodeRed(resolve, reject, commandStr);
    });
    return promise;
  },


  // 连接node red的websocket
  connectNodeRed: function (resolve, reject, commandStr) {
    var _self = this;
    let printers = [];
    _self.webSocket = new WebSocket(this.socketUrl);
    _self.webSocket.onopen = function (event) {
      console.log('打印 Websocket 连接成功。');
      if (commandStr != null && commandStr.length > 0) {
        _self.sendCommand(commandStr);
      } else {
        _self.close();
      }
    };
    _self.webSocket.onclose = function (event) {
      console.log('打印 Websocket 断开连接。');
      resolve(printers);
    };
    _self.webSocket.onerror = function (event) {
      console.log('打印 Websocket 出错。');
      _self.close();
      reject();
    };
    _self.webSocket.onmessage = function (event) {
      var data = JSON.parse(event.data);
      if (data.command == 'getPrinters') {
        printers = data.data;
      }

      if (data.command == 'printPreview') {
        printers = data.previewImages;
      }
      _self.close();
    };
  },


  /**
   * WebSocket 发送指令
   * @param {指令} command 
   */
  sendCommand: function (command) {
    if (this.webSocket) {
      this.webSocket.send(command);
    }
  },

  /**
   * 关闭Websocket
   */
  close: function () {
    if (this.webSocket) {
      this.webSocket.close();
      this.webSocket = null;
    };
  },
};