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POCan I read binary data properly through XDomainRequest?
 

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  1. POCan I read binary data properly through XDomainRequest?
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    <p>Edit: Taking dennmat's suggestion into consideration, I have managed to simplify my image acquiring script down to a few lines using <code>Image()</code>:</p> <pre><code>window.onload = function(){ var img; capture_canvas = document.createElement('canvas'); capture_canvas.width = 1000; capture_canvas.height = 1000; document.documentElement.appendChild(capture_canvas); img = new Image(); img.crossOrigin = "Anonymous"; img.src = "http://www.shangalulu.com/get_resource_no_64.php?url=http://www.shangalulu.com/users/1196739508/post/41-1330377498/41-1330377498_thumb.jpg"; img.onload = function() { var context, canvas_img; context = capture_canvas.getContext('2d'); context.drawImage(img, 0, 0, 255, 255); canvas_img = context.getImageData(0, 0, capture_canvas.width, capture_canvas.height); } } </code></pre> <p>While this works for Chrome and Firefox, this does not for IE9. The solution mentioned in the following link doesn't seem to apply to this situation. <a href="https://stackoverflow.com/questions/2704929/uncaught-error-security-err-dom-exception-18">Uncaught Error: SECURITY_ERR: DOM Exception 18 when I try to set a cookie</a></p> <p>Is the cors feature in <code>Image()</code> supported by IE9?</p> <hr> <p>I've run into a wee little problem.</p> <p><a href="http://www.shangalulu.com/get_resource_no_64.php?url=http://www.shangalulu.com/resources/images/sample/sample.png" rel="nofollow noreferrer">http://www.shangalulu.com/get_resource_no_64.php?url=http://www.shangalulu.com/resources/images/sample/sample.png</a></p> <p>The above image is actually a file that contains the standard png header, followed by 255 bytes going from 255 down to 0 (twice). The idea was to see how Internet Explorer 9 handled receiving binary data through an AJAX request.</p> <p>So, here's my problem: I've noticed that when I receive a byte on the client that's greater than 127, the value is defaulted to 253. Is there a way to get IE to read the extended bytes with the correct values?</p> <p>A few things to take note of:</p> <p>1) We do not use any sort of javascript framework. It is a requirement that we do this only with bare bones javascript.</p> <p>2) The intent of this experiment is to make a clean way to get an image so I can place it on a canvas without tainting it. Sometimes these images come from our externally hosted image server, other times it will come from another host that we have no control over.</p> <p>Attached below is my testing script:</p> <pre><code>var request; window.onload = function(){ request = new XMLHttpRequest(); if (window.XDomainRequest) { request = new XDomainRequest(); } request.open('GET', "http://www.shangalulu.com/get_resource_no_64.php?url= http://www.shangalulu.com/resources/images/sample/sample.png", true); request.onload = function() { var binary, i, response; response = this.responseText; binary = ""; if (this.contentType) { document.documentElement.appendChild( document.createTextNode(this.contentType)); document.documentElement.appendChild(document.createElement('br')); } for( i=0; i &lt; response.length; i++) { binary = "Line " + (i) + " --&gt; " + ((response.charCodeAt(i)) &amp; 0xff); document.documentElement.appendChild(document.createTextNode(binary)); document.documentElement.appendChild(document.createElement('br')); } }; request.send(); } </code></pre>
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    1. COWhat's wrong with `Image()`? See for examples: https://developer.mozilla.org/en/Canvas_tutorial/Using_images
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    2. COYou're essentially going to be shooting yourself in the foot trying to manipulate, manage and draw image data in JS without using the browsers built-in utilities for it. It will be really slow and you'll probably encounter countless issues especially once you get into transparency and rotations.
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    3. COI must have missed the cross origin support the last time I looked at Image(). Thanks for the tip! As for shooting my foot off, I'm not entirely certain what you mean by browser built-in utilities. All I intend to do here is render a simple image onto a canvas that can be fired off to the server.
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