lodop初使用

大致原理：

1.安装一个install_lodop.exe文件安装成功后会开启8000端口和18000端口（C:\Program Files\MountTaiSoftware\CLodop32\SetupOption这个目录下可配端口） 这个2个端口主要提供clodopfunc.js路径（这个文件是跟运行8000服务打通以开启设备打印。这个文件提供了所有跟8000端口交互的接口）

//关键代码
 this.webskt = new WebSocket('ws://127.0.0.1:8089/c_webskt/');//开启监听
 wsSend: function(strData) {//发送打印服务
            if (!this.SocketEnable)
                return;
            if (this.webskt && this.webskt.readyState == 1) {
                this.Result = null;
                this.iTrySendTimes = 0;
                this.webskt.send(strData);
                return true;
            } else {
                alert("WebSocket没准备好，点确定继续...");
                this.iTrySendTimes++;
                if (this.iTrySendTimes <= 1) {
                    setTimeout(CLODOP.wsSend(strData), 500);
                } else {
                    this.OpenWebSocket();
                }
                ;
            }
            ;
        },

3.引入通用jsLodopFuncs.js

//这个js一开始初始化就引入了clodopfunc
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 );
};

这个时候其实就把cloop暴露给当前服务了

LodopFuncs.js还对接口进行了封装

//====获取LODOP对象的主过程：====
function getLodop(oOBJECT,oEMBED){
     var strHtmInstall="<br><font color='#FF00FF'>打印控件未安装!点击这里<a href='http://113.10.155.131/install_lodop32.zip' 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='http://113.10.155.131/install_lodop32.zip' 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='http://113.10.155.131/install_lodop64.zip' 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='http://113.10.155.131/install_lodop64.zip' 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='CLodopPrint_Setup_for_Win32NT.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='CLodopPrint_Setup_for_Win32NT.zip' 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<"2.0.9.0") { 
            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<"6.2.1.5") {
            if (needCLodop())
            document.documentElement.innerHTML=strCLodopUpdate+document.documentElement.innerHTML; else
            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("","13528A153BAEE3A0254B9507DCDE2839","","");
        //===========================================================
        return LODOP;
    } catch(err) {alert("getLodop出错:"+err);};
};