随着H5技术的不断发展与推广，H5技术被广泛用于移动设备，PC终端等众多领域。同时，越来越多的应用都基于B/S（浏览器/服务器）模式，降低开发难度的同时还能更好的普及和应用，突破了硬件设备的兼容性问题。然而，嵌入式开发的设备并没有跟上H5技术的脚步，现在很多嵌入式设备并不支持或者不能友好的支持浏览器应用。举个例子，如何在web浏览器页面使用IC卡读卡器并且兼容所有浏览器？针对这个问题，有人肯定会说利用active X控件就可以了啊！确实如果是基于IE或者IE内核的浏览器使用active X是没有任何问题，但是现在除了使用IE浏览器还有大部分使用Chrome和Firefox等多种内核和版本的浏览器，为了让嵌入式设备更好的兼容所有浏览器，我们提供了一套基于在嵌入式设备中内置WebSocket组件的方案，希望能帮助大家在解决使用浏览器集成嵌入式设备中遇到的难题，一下仅以我司智能卡读写器做详细介绍。
传统的ActiveX组件，通过javascript页面与设备进行信息交互。
<HTML><HEAD><TITLE>第二代居民身份证网页ActiveX控件测试网页</TITLE>
<OBJECT ID=LotusCardDriver Visible=false WIDTH=0 HEIGHT=0
CLASSID="CLSID:BD1874A5-3810-4639-8B70-3DDD607BAADB" CODEBASE="./lotus.CAB#version=1,0,0,4"> </OBJECT>
<SCRIPT language=JavaScript>
<!--
function ReadIDCard() {
var nHandle = 0; //设备句柄
var bResult = 0;
var strTextInfo = "";
var nErrorCode = 0;
clearForm();
nHandle = LotusCardDriver.OpenDevice("",0,0,0);
if(nHandle <=0 )
{
alert("打开设备失败，或者你没有插入读卡器!购买读卡器，请点击 确定 ");
window.location.href="https://item.taobao.com/item.htm?spm=a1z10.1-c.w4004-7912663678.8.HdHoCq&id=542822138758";
return;
}
bResult = LotusCardDriver.Beep(nHandle,10);
if(bResult!=1)
{
alert("蜂鸣失败!");
LotusCardDriver.CloseDevice(nHandle);
return;
}
bResult = LotusCardDriver.SetCardType(nHandle, 'B');
if(bResult!=1)
{
alert("设置卡类型失败!");
LotusCardDriver.CloseDevice(nHandle);
return;
}
//使用1.0服务器
//bResult = LotusCardDriver.GetTwoIdInfoByServer(nHandle, '120.24.253.33');
//bResult = LotusCardDriver.GetTwoIdInfoByServer(nHandle, '192.168.1.101');
//使用调度服务器
bResult = LotusCardDriver.GetTwoIdInfoByMcuServer(nHandle, '112.124.37.59', 'UserName', 'Password', 2);
if(bResult!=1)
{
nErrorCode = LotusCardDriver.GetTwoIdErrorCode(nHandle);
alert("读取二代证信息失败!"+nErrorCode +LotusCardDriver.GetTwoIdErrorInfo(nHandle, nErrorCode));
LotusCardDriver.CloseDevice(nHandle);
return;
}
//解析WL
bResult = LotusCardDriver.WlDecodeByServer(nHandle, '120.24.249.49');//120.24.253.33 211.149.188.24
LotusCardDriver.CloseDevice(nHandle);
fillForm();
/* var ret = CVR_IDCard.ReadCard();
if (ret == "0"){
fillForm();
return;
}
alert("读卡错误,错误原因:" + ret);*/
}
function fillForm() {
var pName=LotusCardDriver.TwoId_Name;
var pSex=LotusCardDriver.TwoId_Sex;
var pNation=LotusCardDriver.TwoId_Nation;
var pBorn=LotusCardDriver.TwoId_Birthday;
var pAddress=LotusCardDriver.TwoId_Address;
var pCardNo=LotusCardDriver.TwoId_No;
var pPolice=LotusCardDriver.TwoId_SignedDepartment;
var pActivityLFrom=LotusCardDriver.TwoId_ValidityPeriodBegin;
var pActivityLTo=LotusCardDriver.TwoId_ValidityPeriodEnd;
var pDeviceNo=0;//LotusCardDriver.CardReaderId;
var pPhotoBuffer=LotusCardDriver.TwoId_PhotoB64;
document.all['Name'].value = pName;
document.all['Sex'].value = pSex;
document.all['Nation'].value = pNation;
document.all['Born'].value = pBorn;
document.all['Address'].value = pAddress;
document.all['CardNo'].value = pCardNo;
document.all['Police'].value = pPolice;
document.all['ActivityLFrom'].value = pActivityLFrom;
document.all['DeviceNo'].value = pDeviceNo;
document.all['ActivityLTo'].value = pActivityLTo;
document.all['PhotoBuffer'].value = pPhotoBuffer;
document.all['PhotoDisplay'].src = 'data:image/jpg;base64,' + pPhotoBuffer;
}
function clearForm() {
document.all['Name'].value = '';
document.all['Sex'].value = '';
document.all['Nation'].value = '';
document.all['Born'].value = '';
document.all['Address'].value = '';
document.all['CardNo'].value = '';
document.all['Police'].value = '';
document.all['ActivityLFrom'].value = '';
document.all['ActivityLTo'].value = '';
document.all['PhotoBuffer'].value = '';
document.all['PhotoDisplay'].src = '';
document.all['DeviceNo'].value = '';
}
//-->
</SCRIPT>
<script>
function gobackhome(){
window.location.href="index.html";
}这种方式在非IE浏览器模式下无法使用，更别提Android和IOS系统上的浏览器了。为了解决在非IE浏览器模式下将我们智能卡读写器嵌入在浏览器中，而且能兼容所有浏览器。我们将读写器单片机里面内置了Websocket组件，读写器采用TCP/IP网络通信，不管是PC浏览器还是Android、IOS浏览器均能实现完美兼容。
范例代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>LotusCard WEB Socket演示页面</title>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name = "viewport" content = "width = 320, initial-scale = 1.0, user-scalable = yes">
<script language="javascript" type="text/javascript">
function getNowFormatDate() {
var date = new Date();
var seperator1 = "-";
var seperator2 = ":";
var month = date.getMonth() + 1;
var strDate = date.getDate();
var socket = null;
var nCommandIndex = 0;
var strIp = "";
var strPort = "";
var wsUrl = "";
if (month >= 1 && month <= 9) {
month = "0" + month;
}
if (strDate >= 0 && strDate <= 9) {
strDate = "0" + strDate;
}
var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
+ " " + date.getHours() + seperator2 + date.getMinutes()
+ seperator2 + date.getSeconds()
+ seperator2 + date.getMilliseconds();
return currentdate;
}
function ConnectServer(){
try {
nCommandIndex = 0;
strIp = document.getElementById('strLotusCardDeviceIp').value;
strPort = document.getElementById('strLotusCardDevicePort').value;
wsUrl = 'ws://'+ strIp +':'+strPort;
socket = new WebSocket(wsUrl);
} catch (evt) {
document.getElementById('log').innerHTML = '<li><b>'+getNowFormatDate()+'#new WebSocket error:'+ evt.data+'</b></li>' + document.getElementById('log').innerHTML;
socket = null;
if (typeof(connCb) != "undefined" && connCb != null)
connCb("-1", "connect error!");
return;
}
socket.onopen = function ()
{
document.getElementById('log').innerHTML = '<li><b>'+getNowFormatDate()+'#连接服务器成功</b></li>' + document.getElementById('log').innerHTML;
document.getElementById('status').innerHTML = 'Socket Open';
document.getElementById('status').className = 'online';
};
socket.onclose =function(event)
{
document.getElementById('log').innerHTML = '<li><b>'+getNowFormatDate()+'#断开连接:' + event.wasClean + '</b></li>' + document.getElementById('log').innerHTML;
document.getElementById('status').innerHTML = 'Socket Closed';
document.getElementById('status').className = 'offline';
};
socket.onmessage = function(event)
{
var arrString;
strLastResult = event.data;
document.getElementById('log').innerHTML = '<li><b>'+getNowFormatDate()+'#收到数据:' + event.data + '</b></li>' + document.getElementById('log').innerHTML;
// arrString = strLastResult.split(',');
// if(COMMAND_OPEN_DEVICE == arrString[0])
// {
// if(arrString.length>2) m_nHandle = arrString[2];
// document.getElementById('log').innerHTML = '<li><b>#获取设备句柄:' + m_nHandle + '</b></li>' + document.getElementById('log').innerHTML;
// }
//document.getElementById('log').innerHTML = '<li><b>#received:' + arrString[0] + '</b></li>' + document.getElementById('log').innerHTML;
//document.getElementById('log').innerHTML = '<li><b>#received:' + arrString.length + '</b></li>' + document.getElementById('log').innerHTML;
};
socket.onerror = function(event)
{
document.getElementById('log').innerHTML = '<li><b>#disconnected:' + event.message + '</b></li>' + document.getElementById('log').innerHTML;
document.getElementById('status').innerHTML = 'Socket Error';
document.getElementById('status').className = 'error';
};
}
function ExecStringCommand(strCommand) {
strLastResult = '';
nCommandIndex++;
if (socket.readyState == WebSocket.OPEN) {
socket.send(strCommand+','+nCommandIndex);
} else {
document.getElementById('log').innerHTML = '<li><b>#send failed. websocket not open. please check.</b></li>' + document.getElementById('log').innerHTML;
}
}
functionGetSocketStatus() {
if(null == socket) return "socket is null";
switch (socket.readyState) {
case socket.CONNECTING:
return "connecting";
break;
case socket.OPEN:
return "open";
break;
case socket.CLOSING:
return "closing";
break;
case socket.CLOSED:
return "closed";
break;
default:
return "undefined";
break
}
};
</script>
<style>
body {
font-family:Verdana,Arial,"Times New Roman";
}
#status {
padding: 5px;
color: #fff;
background: #ccc;
}
#status.error {
background: #c00;
font-weight: bold;
}
#status.offline {
background: #c00;
font-weight: bold;
}
#status.online {
background: #0c0;
font-weight: bold;
}
</style>
</head>
<body>
<h1>LotusCard WEB Socket 演示页面</h1>
<table width="100%">
<tr style="width:100px; height:40px;">
<td>
读卡器IP:
</td>
<td>
<input type="text" value="192.168.1.252" id="strLotusCardDeviceIp" style="width:150px; height:30px;" />
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
读卡器PORT:
</td>
<td>
<input type="text" value="31213" id="strLotusCardDevicePort" style="width:150px; height:30px;" />
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
状态
</td>
<td>
<p id="status"></p>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td colspan="2">
<h3>通信函数:1、连接服务器 2、执行字符串函数并解析结果 3、断开连接</h3>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
连接服务器:
</td>
<td>
<INPUT id = "ConnectServer"type=button value="ConnectServer" onclick="javascript:ConnectServer();" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
关闭连接:
</td>
<td>
<INPUT id = "CloseConnection"type=button value="CloseConnection" onclick="javascript:socket.close();" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
获取连接状态:
</td>
<td>
<INPUT id = "ConnectionStatus"type=button value="ConnectionStatus" onclick="javascript:document.getElementById('log').innerHTML = '<li><b>#status:' + GetSocketStatus() + '</b></li>' + document.getElementById('log').innerHTML;"
style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
获取MCU序列号:
</td>
<td>
<INPUT id = "OpenDevice"type=button value="GetMcuSerailNo" onclick="javascript:ExecStringCommand('GetMcuSerailNo')" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
蜂鸣:
</td>
<td>
<INPUT id = "Beep"type=button value="Beep" onclick="javascript:ExecStringCommand('Beep,10');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
获取M1卡号:
</td>
<td>
<INPUT id = "GetCardNo"type=button value="GetCardNo" onclick="javascript:ExecStringCommand('GetCardNo,38');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
装载密码:
</td>
<td>
<INPUT id = "LoadKey"type=button value="LoadKey" onclick="javascript:ExecStringCommand('LoadKey,96,0,FFFFFFFFFFFF');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
验证密码:
</td>
<td>
<INPUT id = "Authentication"type=button value="Authentication" onclick="javascript:ExecStringCommand('Authentication,96,0');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
读数据扇区0块1:
</td>
<td>
<INPUT id = "M1Read"type=button value="M1Read" onclick="javascript:ExecStringCommand('Read,1');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
写数据扇区0块1:
</td>
<td>
<INPUT id = "M1Write"type=button value="M1Write" onclick="javascript:ExecStringCommand('Write,1,0123456789abcdef0123456789abcdef');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
中止M1卡片:
</td>
<td>
<INPUT id = "M1Halt"type=button value="M1Halt" onclick="javascript:ExecStringCommand('Halt');" style="width:150px; height:30px;"/>
</td>
</tr>
<tr style="width:100px; height:40px;">
<td>
清除日志:
</td>
<td>
<INPUT id = "ClearLog"type=button value="ClearLog" onclick="javascript:document.getElementById('log').innerHTML = '';" style="width:150px; height:30px;"/>
</td>
</tr>
<tr>
<td colspan="2">
<h3>日志</h3>
</td>
</tr>
<tr>
<td colspan="2">
<ul id="log" style="overflow: auto; list-style: none; padding:0; background:#ffffff; font-size:small; border-style:solid; border-color:#c0c0c0"></ul>
</td>
</tr>
</table>
</body>
</html>重庆诺塔斯智能科技有限公司 版权所有 2012-2018
公司地址：重庆市北部新区青枫北路18号凤凰座A579 邮编：400039
联系方式：023-68798110 、18166486520 技术支持：18983125671
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