vue+lodop+pdfjs静默打印pdf

明芫
2,076 阅读3分钟

1.安装引入lodop

首先去官网www.lodop.net/download.ht… 下载 image.png

去下载的包里安装这两东西 image.png

创建lodopFuncs.js

var CreatedOKLodop7766 = null;

//====判断是否需要安装CLodop云打印服务器:====
export function needCLodop() {
    try {
        var ua = navigator.userAgent;
        if (ua.match(/Windows\sPhone/i) != null) return true;
        if (ua.match(/iPhone|iPod/i) != null) return true;
        if (ua.match(/Android/i) != null) return true;
        if (ua.match(/Edge\D?\d+/i) != null) return true;

        var verTrident = ua.match(/Trident\D?\d+/i);
        var verIE = ua.match(/MSIE\D?\d+/i);
        var verOPR = ua.match(/OPR\D?\d+/i);
        var verFF = ua.match(/Firefox\D?\d+/i);
        var x64 = ua.match(/x64/i);
        if ((verTrident == null) && (verIE == null) && (x64 !== null))
            return true;
        else
        if (verFF !== null) {
            verFF = verFF[0].match(/\d+/);
            if ((verFF[0] >= 42) || (x64 !== null)) return true;
        } else
        if (verOPR !== null) {
            verOPR = verOPR[0].match(/\d+/);
            if (verOPR[0] >= 32) return true;
        } else
        if ((verTrident == null) && (verIE == null)) {
            var verChrome = ua.match(/Chrome\D?\d+/i);
            if (verChrome !== null) {
                verChrome = verChrome[0].match(/\d+/);
                if (verChrome[0] >= 42) return true;
            };
        };
        return false;
    } catch (err) { return true; };
};

//====页面引用CLodop云打印必须的JS文件：====
if (needCLodop()) {
    var head = document.head || document.getElementsByTagName("head")[0] || document.documentElement;
    var oscript = document.createElement("script");
    oscript.src = "http://localhost:8000/CLodopfuncs.js?priority=1";
    head.insertBefore(oscript, head.firstChild);

    //引用双端口(8000和18000）避免其中某个被占用：
    oscript = document.createElement("script");
    oscript.src = "http://localhost:18000/CLodopfuncs.js?priority=0";
    head.insertBefore(oscript, head.firstChild);
};

//====获取LODOP对象的主过程：====
export function getLodop(oOBJECT, oEMBED) {
    var strHtmInstall = "<br><font color='#FF00FF'>打印控件未安装!点击这里<a href='../views/deposit/install_lodop32.exe' target='_self'>执行安装</a>,安装后请刷新页面或重新进入。</font>";
    var strHtmUpdate = "<br><font color='#FF00FF'>打印控件需要升级!点击这里<a href='../views/deposit/install_lodop32.exe' target='_self'>执行升级</a>,升级后请重新进入。</font>";
    var strHtm64_Install = "<br><font color='#FF00FF'>打印控件未安装!点击这里<a href='../views/deposit/install_lodop64.exe' target='_self'>执行安装</a>,安装后请刷新页面或重新进入。</font>";
    var strHtm64_Update = "<br><font color='#FF00FF'>打印控件需要升级!点击这里<a href='../views/deposit/install_lodop64.exe' target='_self'>执行升级</a>,升级后请重新进入。</font>";
    var strHtmFireFox = "<br><br><font color='#FF00FF'>（注意：如曾安装过Lodop旧版附件npActiveXPLugin,请在【工具】->【附加组件】->【扩展】中先卸它）</font>";
    var strHtmChrome = "<br><br><font color='#FF00FF'>(如果此前正常，仅因浏览器升级或重安装而出问题，需重新执行以上安装）</font>";
    var strCLodopInstall = "<br><font color='#FF00FF'>CLodop云打印服务(localhost本地)未安装启动!点击这里<a href='http://www.c-lodop.com/download/CLodop_Setup_for_Win32NT_https_3.008Extend.zip' target='_self'>执行安装</a>,安装后请刷新页面。</font>";
    var strCLodopUpdate = "<br><font color='#FF00FF'>CLodop云打印服务需升级!点击这里<a href='CLodop_Setup_for_Win32NT.exe' target='_self'>执行升级</a>,升级后请刷新页面。</font>";
    var LODOP;
    try {
        var isIE = (navigator.userAgent.indexOf('MSIE') >= 0) || (navigator.userAgent.indexOf('Trident') >= 0);
        if (needCLodop()) {
            try { LODOP = getCLodop(); } catch (err) {};
            if (!LODOP && document.readyState !== "complete") { alert("C-Lodop没准备好，请稍后再试！"); return; };
            if (!LODOP) {
                // if (isIE) document.write(strCLodopInstall); else
                // document.documentElement.innerHTML=strCLodopInstall+document.documentElement.innerHTML;
                // return;
            } else {

                if (CLODOP.CVERSION < "3.0.0.2") {
                    if (isIE) document.write(strCLodopUpdate);
                    else
                        document.documentElement.innerHTML = strCLodopUpdate + document.documentElement.innerHTML;
                };
                if (oEMBED && oEMBED.parentNode) oEMBED.parentNode.removeChild(oEMBED);
                if (oOBJECT && oOBJECT.parentNode) oOBJECT.parentNode.removeChild(oOBJECT);
            };
        } else {
            var is64IE = isIE && (navigator.userAgent.indexOf('x64') >= 0);
            //=====如果页面有Lodop就直接使用，没有则新建:==========
            if (oOBJECT != undefined || oEMBED != undefined) {
                if (isIE) LODOP = oOBJECT;
                else LODOP = oEMBED;
            } else if (CreatedOKLodop7766 == null) {
                LODOP = document.createElement("object");
                LODOP.setAttribute("width", 0);
                LODOP.setAttribute("height", 0);
                LODOP.setAttribute("style", "position:absolute;left:0px;top:-100px;width:0px;height:0px;");
                if (isIE) LODOP.setAttribute("classid", "clsid:2105C259-1E0C-4534-8141-A753534CB4CA");
                else LODOP.setAttribute("type", "application/x-print-lodop");
                document.documentElement.appendChild(LODOP);
                CreatedOKLodop7766 = LODOP;
            } else LODOP = CreatedOKLodop7766;
            //=====Lodop插件未安装时提示下载地址:==========
            if ((LODOP == null) || (typeof(LODOP.VERSION) == "undefined")) {
                if (navigator.userAgent.indexOf('Chrome') >= 0)
                    document.documentElement.innerHTML = strHtmChrome + document.documentElement.innerHTML;
                if (navigator.userAgent.indexOf('Firefox') >= 0)
                    document.documentElement.innerHTML = strHtmFireFox + document.documentElement.innerHTML;
                if (is64IE) document.write(strHtm64_Install);
                else
                if (isIE) document.write(strHtmInstall);
                else
                    document.documentElement.innerHTML = strHtmInstall + document.documentElement.innerHTML;
                return LODOP;
            };
        };
        if (LODOP.VERSION < "6.0") {
            if (!needCLodop()) {
                if (is64IE) document.write(strHtm64_Update);
                else
                if (isIE) document.write(strHtmUpdate);
                else
                    document.documentElement.innerHTML = strHtmUpdate + document.documentElement.innerHTML;
            };
            return LODOP;
        };
        //===如下空白位置适合调用统一功能(如注册语句、语言选择等):===
        //LODOP.SET_LICENSES("北京XXXXX公司","8xxxxxxxxxxxxx5","","");

        //===========================================================
        return LODOP;
    } catch (err) { alert("getLodop出错:" + err); };
};

在需要打印的页面引入lodop

import { getLodop } from "./lodopFuncs.js";

lodop打印pdf

    1. base64
 var base64='JVBERi0xLjcKJcKzx9gNA....'
 let LODOP = getLodop();
 LODOP.PRINT_INIT("测试PDF打印功能");
 LODOP.ADD_PRINT_PDF(0,0,"100%","100%",base64);
 //LODOP.PREVIEW(); //预览静默打印直接注释掉这句就可以了
 LODOP.PRINT(); //直接打印
    1. url
 var url='http://demo.clodop.com:8000/CLodopDemos/PDFDemo.pdf'
 let LODOP = getLodop();
 LODOP.PRINT_INIT("测试PDF打印功能");
 LODOP.ADD_PRINT_PDF(0,0,"100%","100%",url);
 //LODOP.PREVIEW(); //预览静默打印直接注释掉这句就可以了
 LODOP.PRINT(); //直接打印

静默打印图片和html有水印，打印pdf是试用版，所以把pdf转图片再打印

接下来引入pdfjs

npm install pdfjs-dist --save

image.png 需打印页面引入

import pdfJs from "pdfjs-dist";
import pdfWorker from "pdfjs-dist/build/pdf.worker";

html

 <!-- //pdf的base64 -->
    <div ref="pdfCache" v-show="false">
      JVBERi0xLjcKJcKzx9gNCjEgMCBvYmoNPDwvTmFtZXMgPDwvRGVzdHMgNCAwIFI....
    </div>  
     <!-- //pdf转成canvas的容器 -->
    <div class="pdfList" v-show="false"></div>
    <!-- //canvas转成图片的容器 -->
    <div class="canvasList" v-show="false"></div>
    <button @click="printPDF(0)">打印pdf测试（base64）</button>
    <button @click="printPDF(1)">打印pdf测试（url）</button>

js

   //兼容ie
   char2buf(str) {
     var out = new ArrayBuffer(str.length);
     var u16a = new Uint8Array(out);
     var strs = str.split("");
     for (var i = 0; i < strs.length; i++) {
       u16a[i] = strs[i].charCodeAt();
     }
     return u16a;
   },
   //打印base64 pdf转png
   async printPDF(status) {
      let pdfList, data, pdf, url;
      pdfJs.GlobalWorkerOptions.workerSrc =  '//mozilla.github.io/pdf.js/build/pdf.worker.js';
     //移除所有孩子
      document.querySelector(".canvasList").innerHTML='';
      this.canvasArr=[];
     if (status == 0) {
     //base64
       pdfList = document.querySelector(".pdfList");
       pdfList.innerHTML = "";
       data = this.char2buf(window.atob(this.$refs.pdfCache.innerText));
       pdf = await pdfJs.getDocument({ data: data }); //返回一个pdf对象
     } else {
     //url
       url = "http://demo.clodop.com:8000/CLodopDemos/PDFDemo.pdf";
       pdf = await pdfJs.getDocument(url);
     }
     let pages = pdf.numPages; //声明一个pages变量等于当前pdf文件的页数
     for (let i = 1; i <= pages; i++) {
       //循环页数
       let canvas = document.createElement("canvas");
       let page = await pdf.getPage(i); //调用getPage方法传入当前循环的页数,返回一个page对象
       let scale = 2; //缩放倍数，1表示原始大小,为了调整分辨率解决模糊问题设置为2
       let viewport = page.getViewport(scale);
       let context = canvas.getContext("2d"); //创建绘制canvas的对象
       canvas.height = viewport.height; 
       canvas.width = viewport.width;
       let renderContext = {
         canvasContext: context,
         viewport: viewport,
       };
       await page.render(renderContext);
       canvas.className = "canvas"; //给canvas节点定义一个class名,这里我取名为canvas
       // pdfList.appendChild(canvas); //插入到pdfList节点的最后
       this.canvasArr.push(canvas);
     }
     await this.convertCanvasToImage();
     let canvasList = document.querySelector(".canvasList").innerHTML;
     let LODOP = getLodop();
     LODOP.SET_PRINT_PAGESIZE(0, "", "", "A4"); //设置纸张为A4
     LODOP.ADD_PRINT_HTM(0, 0, "100%", "100%", canvasList);
     // LODOP.PREVIEW();
     LODOP.PRINT();
   },
   // 打印pdf转后图片
   convertCanvasToImage() {
     let canvasList = document.querySelector(".canvasList");
     for (let i = 0; i < this.canvasArr.length; i++) {
       const base64 = this.canvasArr[i].toDataURL("image/png");
       const img = document.createElement("img");
       img.setAttribute("class", `pdf-img`);
       img.src = base64;
       img.style.width = "100%";
       canvasList.appendChild(img);
     }
   },

有水印有水印有水印，如果引入pdfjs不成功大概率是版本问题

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