h5调用摄相头进行解析二维码图片 

<!DOCTYPE html>  
<head>  
    <title>HTML5 GetUserMedia Demo</title>  
     <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />  
    <script src="js/jquery-2.1.4.min.js"></script>
</head>  
<body>  
    <input type="button" title="开启摄像头" value="开启摄像头" onclick="getMedia();" /><br />  
    <video height="120px" autoplay="autoplay"></video><hr />  
    <input type="button" title="拍照" value="拍照" onclick="getPhoto();" /><br />  
    <canvas id="canvas" style="height:120px;" ></canvas><hr />  
    <br> <input type="button" title="关闭摄像头" value="关闭摄像头" onclick="stop();" />
  
    <script type="text/javascript">  
        var video = document.querySelector('video');  
        var audio, audioType;  
  
        var canvas = document.getElementById('canvas');  
        var context = canvas.getContext('2d');  
        var mediaStreamTrack;
  
        navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;  
        window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;  
  
        var exArray = []; //存储设备源ID
        MediaStreamTrack.getSources(function (sourceInfos) {
            for (var i = 0; i != sourceInfos.length; ++i) {
                var sourceInfo = sourceInfos[i];
                //这里会遍历audio,video，所以要加以区分
                if (sourceInfo.kind === 'video') {
                    exArray.push(sourceInfo.id);
                }
            }
        });
  
        function getMedia() {  

            if (navigator.getUserMedia) {  
                navigator.getUserMedia({  
                    'video': {  
                        'optional': [{  
                            'sourceId': exArray[1] //0为前置摄像头，1为后置  
                        }]  
                    },  
                    'audio':false  
                }, successFunc, errorFunc);    //success是获取成功的回调函数  
            }
            else {  
                alert('Native device media streaming (getUserMedia) not supported in this browser.');  
            }  
        }  
  
        function successFunc(stream) {  
            mediaStreamTrack = typeof stream.stop === 'function' ? stream : stream.getTracks()[0];
            if (video.mozSrcObject !== undefined) {  
                //Firefox中，video.mozSrcObject最初为null，而不是未定义的，我们可以靠这个来检测Firefox的支持  
                video.mozSrcObject = stream;  
            }  
            else {  
                video.src = window.URL && window.URL.createObjectURL(stream) || stream;  
            }  
  
            //video.play();  
  
            // 音频  
            //audio = new Audio();  
            //audioType = getAudioType(audio);  
            //if (audioType) {  
                //audio.src = 'polaroid.' + audioType;  
                //audio.play();  
            //}  
        }  
        function errorFunc(e) {  
            alert('Error！'+e);  
        }  
  
        function stop(){
          mediaStreamTrack && mediaStreamTrack.stop();
        }
  
        //获取音频格式  
        function getAudioType(element) {  
            if (element.canPlayType) {  
                if (element.canPlayType('audio/mp4; codecs="mp4a.40.5"') !== '') {  
                    return ('aac');  
                } else if (element.canPlayType('audio/ogg; codecs="vorbis"') !== '') {  
                    return ("ogg");  
                }  
            }  
            return false;  
        }  
  
        // vedio播放时触发，绘制vedio帧图像到canvas  
//        video.addEventListener('play', function () {  
//            drawVideoAtCanvas(video, context2);  
//        }, false);  
  
        //拍照  
        function getPhoto() {  
            context.drawImage(video, 0, 0,90,120); //将video对象内指定的区域捕捉绘制到画布上指定的区域，实现拍照。  
            CatchCode(); 
        }  
  
  //抓屏获取图像流，并上传到服务器      
   function CatchCode() {        
    if(canvas!=null)
    {  
           //以下开始编 数据   
        var imgData = canvas.toDataURL(); 
        //将图像转换为base64数据
        var base64Data = imgData;//.substr(22); //在前端截取22位之后的字符串作为图像数据
        //alert(base64Data);
        //return;
        //开始异步上
       $.post("/Triage/GetPatientIDByQRCode", { "imgBase64": base64Data },function (result)
       {   
          alert(result.Data);
       },"json");
    }
} 
    </script>  
</body>

 

 

后台代码：

  public string GetPatientIDByQRCode(string imgBase64)
        {
            string[] str = imgBase64.Split(',');
            imgBase64 = str[1];
            HttpContext.Response.AppendHeader("Access-Control-Allow-Origin", "*");
            BizResult biz = new BizResult();
            byte[] arr = Convert.FromBase64String(imgBase64);
            MemoryStream ms = new MemoryStream(arr);
            Bitmap bmp = new Bitmap(ms);
            ms.Close();

            BarcodeReader reader = new BarcodeReader();
            reader.Options.CharacterSet = "UTF-8";
            var result = reader.Decode(bmp);
            if (result != null)
            {
                biz.IsSuccess = true;
                biz.Data = result.Text;
            }
            else
            {
                biz.IsSuccess = false;
                biz.Msgs.Add("解析失败，请重试");
            }
            return biz.ToJson();
        }

 

posted @ 2018-10-19 14:15  CD啊明  阅读(816)  评论(0)    收藏  举报