如何在移动设备(android, IOS等)和桌面MVC 4中访问Camera

Question

如何使用MVC 4网站访问移动设备和台式电脑中的摄像头?仅用于捕获图像以及如何识别相机。我已经尝试使用下面的代码。但它不能在IOS上工作，也不能捕获图像。

<script>
    // Put event listeners into place
    window.addEventListener("DOMContentLoaded", function () {
        // Grab elements, create settings, etc.
        var canvas = document.getElementById("canvas"),
            context = canvas.getContext("2d"),
            video = document.getElementById("video"),
            videoObj = { "video": true },
            errBack = function (error) {
                console.log("Video capture error: ", error.code);
            };
        // Put video listeners into place
        if (navigator.getUserMedia) { // Standard
            navigator.getUserMedia(videoObj, function (stream) {
                video.src = stream;
                video.play();
            }, errBack);
        } else if (navigator.webkitGetUserMedia) { // WebKit-prefixed
            navigator.webkitGetUserMedia(videoObj, function (stream) {
                video.src = window.webkitURL.createObjectURL(stream);
                video.play();
            }, errBack);
        }
        else if (navigator.mozGetUserMedia) { // Firefox-prefixed
            navigator.mozGetUserMedia(videoObj, function (stream) {
                video.src = window.URL.createObjectURL(stream);
                video.play();
            }, errBack);
        }
    }, false);
    // Trigger photo take
    document.getElementById("snap").addEventListener("click", function () {
        context.drawImage(video, 0, 0, 100, 100);
    });
</script>

Answer 1

从iOS 6开始，你可以直接使用输入标签:

<input type="file" />

它将启动/允许访问相机/照片。