stopScanWXDevice[停止扫描设备]接口实现

前几天刚分享了关于微信硬件扫描设备接口的实现 ，既然微信硬件接口有扫描设备接口，肯定也有停止扫描设备接口，去翻看了下文档，果不期然，微信硬件停止扫描设备接口的名字为stopScanWXDevice ,下面是微信官方文档关于此接口的使用说明。

我们主要看看调用此接口的参数，文档参数说明：

connType： 要停止扫描的设备类型，值为blue或者lan或者为空。如果为空，默认为blue。
Blue表示蓝牙设备，
lan表示局域网设备

具体实现的js代码为：

/***
停止扫描设备
www.vxzsk.com原创
****/
function my_stopScanWXDevice(){
    
    WeixinJSBridge.invoke('stopScanWXDevice', {}, function(res){
        mlog("停止扫描设备返回:"+res.err_msg);
            
    }); 
  return;    
}

下面呢，我再次晒出整体实现此功能的代码流程。本代码基于springMVC框架内

一）springMVC controller方法

/****
www.vxzsk.com原创
****/
@RequestMapping(value="/wxlanya")
    public ModelAndView wxJsSdkConfig(HttpServletRequest request,HttpServletResponse response){
        String url=null;
        if(StringUtils.isNotEmpty(request.getQueryString())){
            url = request.getRequestURL()+"?"+request.getQueryString();
        }else{
            url = request.getRequestURL()+"";
        }
        System.out.println("请求地址"+url);
        //1,获取access_token
        AccessToken accessToken = WeixinUtil.getAccessToken(AppConst.APP_ID, AppConst.APPSECRET);
        String access_token=accessToken.getToken();
        String ticket = WeixinUtil.getJsapiTicket(access_token);
        Map<String,String> map = WeixinUtil.sign(ticket,  url);
         
        request.setAttribute("timestamp", map.get("timestamp"));
        request.setAttribute("nonceStr", map.get("nonceStr"));
        request.setAttribute("signature", map.get("signature"));
        request.setAttribute("appId", AppConst.APP_ID);
         
        return new ModelAndView("/weixin/nfc/wxlanya");
    }

1，变量jsapiTicket的获取请参考https://www.vxzsk.com/298.html 

2，access_token的获取方法请参考https://www.vxzsk.com/28.html

3，WeixinUtil中的sign方法如下：

/***
     * 获取界面调用jsapi的所需参数
     * @param jsapi_ticket 凭据
     * @param url 界面请求地址
     * @return V型知识库 www.vxzsk.com
     */
    public static Map<String, String> sign(String jsapi_ticket, String url) {
        Map<String, String> ret = new HashMap<String, String>();
        String nonce_str = create_nonce_str();
        String timestamp = create_timestamp();
        String string1;
        String signature = "";
  
        //注意这里参数名必须全部小写，且必须有序
        string1 = "jsapi_ticket=" + jsapi_ticket +
                  "&noncestr=" + nonce_str +
                  "&timestamp=" + timestamp +
                  "&url=" + url;
        System.out.println(string1);
  
        try
        {
            MessageDigest crypt = MessageDigest.getInstance("SHA-1");
            crypt.reset();
            crypt.update(string1.getBytes("UTF-8"));
            signature = byteToHex(crypt.digest());
        }
        catch (NoSuchAlgorithmException e)
        {
            e.printStackTrace();
        }
        catch (UnsupportedEncodingException e)
        {
            e.printStackTrace();
        }
  
        ret.put("url", url);
        ret.put("jsapi_ticket", jsapi_ticket);
        ret.put("nonceStr", nonce_str);
        ret.put("timestamp", timestamp);
        ret.put("signature", signature);
  
        return ret;
    }
      
    private static String byteToHex(final byte[] hash) {
        Formatter formatter = new Formatter();
        for (byte b : hash)
        {
            formatter.format("%02x", b);
        }
        String result = formatter.toString();
        formatter.close();
        return result;
    }
  
    private static String create_nonce_str() {
        return UUID.randomUUID().toString();
    }
  
    private static String create_timestamp() {
        return Long.toString(System.currentTimeMillis() / 1000);
    }

4, AppConst.APP_ID，AppConst.APPSECRET的值其实是一个固定值，替换为自己公众号中的appid即可。

二）新建wxlanya.jsp页面

1，在controller中返回界面为wxlanya.jsp 其实本界面就是H5界面，界面中有两个按钮，分别是开始扫描设备按钮和停止扫描设备按钮，本章节介绍的是停止扫描设备接口stopScanWXDevice，所以js实现代码如下

/***
停止扫描设备
www.vxzsk.com原创
****/
function my_stopScanWXDevice(){
    
    WeixinJSBridge.invoke('stopScanWXDevice', {}, function(res){
        mlog("停止扫描设备返回:"+res.err_msg);
            
    }); 
  return;    
}

2，在点击停止扫描设备按钮的时候必须首先点击开始扫描设备按钮，因为开始扫描设备按钮会触发微信硬件jsapi库，否则停止扫描设备接口会初始化失败。初始化硬件库的方法为my_openWXDeviceLib()   打开微信设备函数库函数 已经在https://www.vxzsk.com/333.html 介绍，不清楚的读者可前往研读。

3，测试

在这里，本案例请求spring的controller方法路径为http://www.xxxx.com/wx/wxlanya.do 进入wxlanya.jsp页面，效果如下

如上图所示，停止扫描设备接口stopScanWXDevice被触发后返回值已经打印输出在界面中了

4，完整wxlanya.jsp代码

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
session.setAttribute("basePath",basePath);
%>
<!DOCTYPE html>
<html class="ie"><!--<![endif]-->
<head>
<meta charset="utf-8">
  <title>微信蓝牙设备-V型知识库www.vxzsk.com</title>
  <meta name="viewport" content="width=320.1,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
  
  <link rel="stylesheet" href="<%=basePath %>/resource/device/weui.min.css?what=0">
  <script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
  <script src="http://res.wx.qq.com/open/js/jweixin-1.1.0.js"> </script>
 
  
</head>
<body ontouchstart>
<!--标题行-->
<h2 style="color: white;background-color: green;text-align: center;background-position: center;">蓝牙设备</h2>
  <div class="page">
    <div class="bd spacing">
        <div class="weui_cells weui_cells_form">
                
            <div class="weui_cell">
                <div class="weui_cell_hd"><label class="weui_label" style="width: auto;">当前设备:&nbsp</label></div>
                <div class="weui_cell_bd weui_cell_primary">
                   <label id="lbdeviceid" class="weui_label" style="width: auto;"></label>
                </div>
            </div>
            <div class="weui_cell">
                <div class="weui_cell_hd"><label class="weui_label" style="width: auto;">状态信息:&nbsp</label></div>
                <div class="weui_cell_bd weui_cell_primary">
                    <label id="lbInfo" class="weui_label" style="width: auto;"></label>
                </div>
            </div> 
            <div class="weui_cell" >
                <div class="weui_cell_hd"><label class="weui_label">日志:  </label></div>
                <div class="weui_cell_bd weui_cell_primary">
                    <textarea id="logtext" class="weui_textarea" placeholder="日志" rows="5"></textarea>
                </div>
            </div>
  
        </div>
 
        <div class="weui_btn_area weui">
             
            <button class="weui_btn weui_btn weui_btn_warn" id="CallGetWXrefresh">开始扫描设备</button><br>
            <button class="weui_btn weui_btn weui_btn_warn" id="stopScanWXDevice">停止扫描设备</button><br>
             
        </div>
  
    </div>
 
    <div class="weui_dialog_alert" id="Mydialog" style="display: none;">
    <div class="weui_mask"></div>
    <div class="weui_dialog">
        <div class="weui_dialog_hd" id="dialogTitle"><strong class="weui_dialog_title">着急啦</strong></div>
        <div class="weui_dialog_bd" id="dialogContent">亲,使用本功能,请先打开手机蓝牙！</div>
        <div class="weui_dialog_ft">
            <a href="#" class="weui_btn_dialog primary">确定</a>
        </div>
    </div>
    </div>
     
     
    <!--BEGIN toast-->
    <div id="toast" style="display: none;">
        <div class="weui_mask_transparent"></div>
        <div class="weui_toast">
            <i class="weui_icon_toast"></i>
            <p class="weui_toast_content" id="toast_msg">已完成</p>
        </div>
    </div>
    <!--end toast-->
 
    <!-- loading toast -->
    <div id="loadingToast" class="weui_loading_toast" style="display:none;">
        <div class="weui_mask_transparent"></div>
        <div class="weui_toast">
            <div class="weui_loading">
                <div class="weui_loading_leaf weui_loading_leaf_0"></div>
                <div class="weui_loading_leaf weui_loading_leaf_1"></div>
                <div class="weui_loading_leaf weui_loading_leaf_2"></div>
                <div class="weui_loading_leaf weui_loading_leaf_3"></div>
                <div class="weui_loading_leaf weui_loading_leaf_4"></div>
                <div class="weui_loading_leaf weui_loading_leaf_5"></div>
                <div class="weui_loading_leaf weui_loading_leaf_6"></div>
                <div class="weui_loading_leaf weui_loading_leaf_7"></div>
                <div class="weui_loading_leaf weui_loading_leaf_8"></div>
                <div class="weui_loading_leaf weui_loading_leaf_9"></div>
                <div class="weui_loading_leaf weui_loading_leaf_10"></div>
                <div class="weui_loading_leaf weui_loading_leaf_11"></div>
            </div>
            <p class="weui_toast_content" id="loading_toast_msg">数据加载中</p>
        </div>
    </div>
    <!-- End loading toast -->
     
    <!--BEGIN dialog1-->
    <div class="weui_dialog_confirm" id="dialog1" style="display: none;">
        <div class="weui_mask"></div>
        <div class="weui_dialog">
            <div class="weui_dialog_hd"><strong class="weui_dialog_title">弹窗标题</strong></div>
            <div class="weui_dialog_bd">自定义弹窗内容，居左对齐显示，告知需要确认的信息等</div>
            <div class="weui_dialog_ft">
                <a href="javascript:;" class="weui_btn_dialog default" id="qxBtn">取消</a>
                <a href="javascript:;" class="weui_btn_dialog primary" id="okBtn">确定</a>
            </div>
        </div>
    </div>
    <!--END dialog1-->
    <!--BEGIN dialog2-->
    <div class="weui_dialog_alert" id="dialog2" style="display: none;">
        <div class="weui_mask"></div>
        <div class="weui_dialog">
            <div class="weui_dialog_hd"><strong class="weui_dialog_title">弹窗标题</strong></div>
            <div class="weui_dialog_bd">弹窗内容，告知当前页面信息等</div>
            <div class="weui_dialog_ft">
                <a href="javascript:;" class="weui_btn_dialog primary">确定</a>
            </div>
        </div>
    </div>
    <!--END dialog2-->
</div>
 
<div id="myparams" style="display: none">
 <span id="timestamp">${timestamp }</span>
 <span id="nonceStr">${nonceStr }</span>
 <span id="signature">${signature }</span>
 <span id="appId">${appId }</span>
  
</div>
 
</body> 
<script type="text/javascript">
 jQuery(document).ready(function(){
  //初始化库 
 loadXMLDoc();
 //初始化库结束
 //点击获取设备按钮的函数 开始
 $("#CallGetWXrefresh").on("click",function(e){  
    
     //1. 打开微信设备 
     my_openWXDeviceLib();
     //2. 扫描设备
     my_startScanWXDevice();
      
 });
 //点击获取设备按钮的函数 结束 
  
 jQuery("#stopScanWXDevice").click(function(){
  //3. 停止扫描设备
     my_stopScanWXDevice();
 });
   
 });
  
 //初始化 微信硬件jsapi库
function loadXMLDoc()
{
    var appId =jQuery("#appId").text();
    var timestamp=jQuery("#timestamp").text();
    var nonceStr =jQuery("#nonceStr").text();
    var signature=jQuery("#signature").text();
    wx.config({
             beta: true,
              debug: true,// 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
              appId: appId, 
              timestamp: timestamp,
              nonceStr: nonceStr,
              signature: signature,
              jsApiList: [
                'openWXDeviceLib',
                'closeWXDeviceLib',
                'getWXDeviceInfos',
                'getWXDeviceBindTicket',
                'getWXDeviceUnbindTicket',
                'startScanWXDevice',
                'stopScanWXDevice',
                'connectWXDevice',
                'disconnectWXDevice',
                'sendDataToWXDevice',
                'onWXDeviceBindStateChange',
                'onWXDeviceStateChange',
                'onScanWXDeviceResult',
                'onReceiveDataFromWXDevice',
                'onWXDeviceBluetoothStateChange',
              ]
          });
             alert("初始化库结束");
}
//判断调用jsapi返回状态 true表示成功
wx.error(function (res) {
  alert("调用微信jsapi返回的状态:"+res.errMsg);
});
 
/******************************分割线************************************************/
/*********************************************************
* 打开微信设备
* 作者：vxzsk.com 2016-04-04
* my_openWXDeviceLib
* 入口参数：无
* 出口参数：0表示打开成功；1表示打开失败
*********************************************************/
function my_openWXDeviceLib(){
   var x=0; 
   WeixinJSBridge.invoke('openWXDeviceLib', {}, 
   function(res){
       mlog("打开设备返回："+res.err_msg);
      if(res.err_msg=='openWXDeviceLib:ok')
        {
          if(res.bluetoothState=='off')
            {    
              showdialog("太着急啦","亲,使用前请先打开手机蓝牙！");  
              $("#lbInfo").innerHTML="1.请打开手机蓝牙";
              $("#lbInfo").css({color:"red"});
              x=1;
              isOver();
            };
          if(res.bluetoothState=='unauthorized')
            {
              showdialog("出错啦","亲,请授权微信蓝牙功能并打开蓝牙！");    
              $("#lbInfo").html("1.请授权蓝牙功能");
              $("#lbInfo").css({color:"red"});
              x=1;
              isOver();
            }; 
          if(res.bluetoothState=='on')
            {
              //showdialog("太着急啦","亲,请查看您的设备是否打开！");   
              $("#lbInfo").html("1.蓝牙已打开");
              $("#lbInfo").css({color:"red"});
              //$("#lbInfo").attr(("style", "background-color:#000");
              x=0;
              //isOver();
            };      
        }
      else
        {
          $("#lbInfo").html("1.微信蓝牙打开失败");
          x=1; 
          showdialog("微信蓝牙状态","亲,请授权微信蓝牙功能并打开蓝牙！");   
        }
    });
   return x;  //0表示成功 1表示失败
}
 
 
 
 
 
/**********************************************
* 扫描设备
* 作者：2017-02-14
* my_getWXDeviceInfos
* 入口参数：无
* 出口参数：返回一个已经链接的设备的ID
**********************************************/
function my_startScanWXDevice(){
    
    WeixinJSBridge.invoke('startScanWXDevice', {}, function(res){
        mlog("扫描设备返回:"+res.err_msg);
            
    }); 
  return;    
}

/***
停止扫描设备
****/
function my_stopScanWXDevice(){
    
    WeixinJSBridge.invoke('stopScanWXDevice', {}, function(res){
        mlog("停止扫描设备返回:"+res.err_msg);
            
    }); 
  return;    
}


//打印日志
function mlog(m){
    var log=$('#logtext').val();
    //log=log+m;
    log = m;
    $('#logtext').val(log);
}
 
/***************************************************************
 * 显示提示信息
***************************************************************/
function showdialog(DialogTitle,DialogContent){
   var $dialog = $("#Mydialog");
   $dialog.find("#dialogTitle").html(DialogTitle);
   $dialog.find("#dialogContent").html(DialogContent);
   $dialog.show();
   $dialog.find(".weui_btn_dialog").one("click", function(){
        $dialog.hide();
   });
}
 
</script>
</html>