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POhow do I access XHR responseBody (for binary data) from Javascript in IE?
 

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  1. POhow do I access XHR responseBody (for binary data) from Javascript in IE?
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    <p>I've got a web page that uses <a href="http://msdn.microsoft.com/en-us/library/ms535874(VS.85).aspx" rel="noreferrer">XMLHttpRequest</a> to download a binary resource. </p> <p>In Firefox and Gecko I can use responseText to get the bytes, even if the bytestream includes binary zeroes. I may need to coerce the mimetype with <code>overrideMimeType()</code> to make that happen. In IE, though, responseText doesn't work, because it appears to terminate at the first zero. If you read 100,000 bytes, and byte 7 is a binary zero, you will be able to access only 7 bytes. IE's XMLHttpRequest exposes a <code>responseBody</code> property to access the bytes. I've seen a few posts suggesting that it's impossible to access this property in any meaningful way directly from Javascript. This sounds crazy to me. </p> <p><code>xhr.responseBody</code> <em>is</em> accessible from VBScript, so the obvious workaround is to define a method in VBScript in the webpage, and then call that method from Javascript. See <a href="http://code.google.com/p/jsdap/source/browse/trunk/api.js?r=64" rel="noreferrer">jsdap</a> for one example. <strong>EDIT: DO NOT USE THIS VBScript!!</strong></p> <pre><code>var IE_HACK = (/msie/i.test(navigator.userAgent) &amp;&amp; !/opera/i.test(navigator.userAgent)); // no no no! Don't do this! if (IE_HACK) document.write('&lt;script type="text/vbscript"&gt;\n\ Function BinaryToArray(Binary)\n\ Dim i\n\ ReDim byteArray(LenB(Binary))\n\ For i = 1 To LenB(Binary)\n\ byteArray(i-1) = AscB(MidB(Binary, i, 1))\n\ Next\n\ BinaryToArray = byteArray\n\ End Function\n\ &lt;/script&gt;'); var xml = (window.XMLHttpRequest) ? new XMLHttpRequest() // Mozilla/Safari/IE7+ : (window.ActiveXObject) ? new ActiveXObject("MSXML2.XMLHTTP") // IE6 : null; // Commodore 64? xml.open("GET", url, true); if (xml.overrideMimeType) { xml.overrideMimeType('text/plain; charset=x-user-defined'); } else { xml.setRequestHeader('Accept-Charset', 'x-user-defined'); } xml.onreadystatechange = function() { if (xml.readyState == 4) { if (!binary) { callback(xml.responseText); } else if (IE_HACK) { // call a VBScript method to copy every single byte callback(BinaryToArray(xml.responseBody).toArray()); } else { callback(getBuffer(xml.responseText)); } } }; xml.send(''); </code></pre> <p>Is this really true? The best way? copying every byte? For a large binary stream that's not going to be very efficient. </p> <p>There is also a <em>possible</em> technique using ADODB.Stream, which is a COM equivalent of a MemoryStream. <a href="http://help.dottoro.com/ljgqlcox.php" rel="noreferrer">See here</a> for an example. It does not require VBScript but does require a separate COM object.</p> <pre><code>if (typeof (ActiveXObject) != "undefined" &amp;&amp; typeof (httpRequest.responseBody) != "undefined") { // Convert httpRequest.responseBody byte stream to shift_jis encoded string var stream = new ActiveXObject("ADODB.Stream"); stream.Type = 1; // adTypeBinary stream.Open (); stream.Write (httpRequest.responseBody); stream.Position = 0; stream.Type = 1; // adTypeBinary; stream.Read.... /// ???? what here } </code></pre> <p>But that's not going to work well - ADODB.Stream is disabled on most machines these days. </p> <hr> <p>In The IE8 developer tools - the IE equivalent of Firebug - I can see the responseBody is an array of bytes and I can even see the bytes themselves. The data is <em>right there</em>. I don't understand why I can't get to it. </p> <p>Is it possible for me to read it with responseText? </p> <p>hints? (other than defining a VBScript method)</p>
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