2018-5-22 seo達(dá)人
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[HTML]代碼
[C#后臺(tái)]
<html>
<head>
<title>二維碼掃描測(cè)試</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<style type="text/css">
html, body {
height: 100%;
width: 100%;
text-align: center;
}
</style>
<script src="../js/jquery-1.11.1.min.js"></script>
<script>
//這段代 主要是獲取攝像頭的視頻流并顯示在Video 簽中
var canvas = null, context = null, video = null;
window.addEventListener("DOMContentLoaded", function () {
try {
canvas = document.getElementById("canvas");
context = canvas.getContext("2d");
video = document.getElementById("video");
flag = true,
MediaErr = function (error) {
flag = false;
if (error.PERMISSION_DENIED) {
alert('用戶拒絕了瀏覽器請(qǐng)求媒體的權(quán)限', '提示');
} else if (error.NOT_SUPPORTED_ERROR) {
alert('對(duì)不起,您的瀏覽器不支持拍照功能,請(qǐng)使用其他瀏覽器', '提示');
} else if (error.MANDATORY_UNSATISFIED_ERROR) {
alert('指定的媒體類型未接收到媒體流', '提示');
} else {
alert('系統(tǒng)未能獲取到攝像頭,請(qǐng)確保攝像頭已正確安裝。或嘗試刷新頁(yè)面,重試', '提示');
}
};
//獲取媒體的兼容代碼,目前只支持(Firefox,Chrome,Opera)
if (navigator.getUserMedia) {
//qq瀏覽器不支持
if (navigator.userAgent.indexOf('MQQBrowser') > -1) {
alert('對(duì)不起,您的瀏覽器不支持拍照功能,請(qǐng)使用其他瀏覽器', '提示');
return false;
}
navigator.getUserMedia(videoObj, function (stream) {
video.src = stream;
video.play();
}, MediaErr);
}
else if (navigator.webkitGetUserMedia) {
navigator.webkitGetUserMedia(videoObj, function (stream) {
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, MediaErr);
}
else if (navigator.mozGetUserMedia) {
navigator.mozGetUserMedia(videoObj, function (stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
}, MediaErr);
}
else if (navigator.msGetUserMedia) {
navigator.msGetUserMedia(videoObj, function (stream) {
$(document).scrollTop($(window).height());
video.src = window.URL.createObjectURL(stream);
video.play();
}, MediaErr);
} else {
alert('對(duì)不起,您的瀏覽器不支持拍照功能,請(qǐng)使用其他瀏覽器');
return false;
}
if (flag) {
//alert('為了獲得更準(zhǔn)確的測(cè)試結(jié)果,請(qǐng)盡量將二維碼置于框中,然后進(jìn)行拍攝、掃描。 請(qǐng)確保瀏覽器有權(quán)限使用攝像功能');
}
//這個(gè)是拍照按鈕的事件,
$("#snap").click(function () { startPat(); }).show();
} catch (e) {
printHtml("瀏覽器不支持HTML5 CANVAS");
}
}, false);
function printHtml(content) {
$(window.document.body).append(content + "<br/>");
}
//開始拍照
function startPat() {
setTimeout(function () {//防止調(diào)用過快
if (context) {
context.drawImage(video, 0, 0, 320, 320);
CatchCode();
}
}, 200);
}
//抓屏獲取圖像流,并上傳到服務(wù)器
function CatchCode() {
if (canvas != null) {
//以下開始編 數(shù)據(jù)
var imgData = canvas.toDataURL("image/jpeg");
//將圖像轉(zhuǎn)換為base64數(shù)據(jù)
var base64Data = imgData; //在前端截取22位之后的字符串作為圖像數(shù)據(jù)
type: 'post',
url: '../ashx/HandlerScan.ashx?method=ParseImage',
data: 'ImgData=' + base64Data,
dataType: "json",
cache: false,
timeout: 10000,
success: function (mes) {
if (mes.code == '1') {
alert('未識(shí)別二維碼,請(qǐng)重新掃描!');
}
else {
alert(mes.name);
}
},
error: function (err) {
alert('掃描失敗' + err);
}
});
}
}
</script>
<body>
<div id="support"></div>
<div id="contentHolder">
<video id="video" width="320" height="320" autoplay></video>
<canvas id="canvas" style="display:none; background-color:#F00;" width="320" height="320"></canvas><br/>
<button id="snap" style="display:none; height:50px; width:120px;">開始掃描</button>
</div>
</body>
</html>
{
private JsonResult js = new JsonResult();
public void ProcessRequest(HttpContext context)
{
string result = string.Empty;
string method = context.Request.QueryString.ToString();//獲取想要做的操作
switch (method)
{
case "method=ParseImage":
result = ParseImage(context);
break;
default:
break;
}
context.Response.ContentType = "text/json";
context.Response.Write(result);
}
{
try
{
string imgStr = context.Request.Params["ImgData"].ToString();
imgStr = imgStr.Replace("data:image/jpeg;base64,", "");
//整理字符串
imgStr = imgStr.Replace(" ", "+");
byte[] arr = Convert.FromBase64String(imgStr);
MemoryStream ms = new MemoryStream(arr, 0, arr.Length);
Bitmap bmp = new Bitmap(ms);
//解析圖片
Result result = new BarcodeReader().Decode(bmp);
if(result == null)
{
return "{\"code\":1,\"name\":\"\"}";
}
else
{
string[] a = result.Text.Split(',');
string str = "{\"code\":0,\"name\":\"" + a[0] + "\"}";
return str;
}
}
catch (Exception ex)
{
return "{\"code\":1,\"msg\":\"" + ex.Message + "\",\"userName\":\"\"}";
}
}
{
get
{
return false;
}
}
}
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