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POIn Java, retrieve a JPEG from a URL and convert it to binary or hexadecimal form suitable for embedding in an RTF document
 

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  1. POIn Java, retrieve a JPEG from a URL and convert it to binary or hexadecimal form suitable for embedding in an RTF document
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    <p>I'm trying to write a simple RTF document pretty much from scratch in Java, and I'm trying to embed JPEGs in the document. Here's an example of a JPEG (a 2x2-pixel JPEG consisting of three white pixels and a black pixel in the upper left, if you're curious) embedded in an RTF document (generated by WordPad, which converted the JPEG to WMF):</p> <pre><code>{\pict\wmetafile8\picw53\pich53\picwgoal30\pichgoal30 0100090000036e00000000004500000000000400000003010800050000000b0200000000050000 000c0202000200030000001e000400000007010400040000000701040045000000410b2000cc00 020002000000000002000200000000002800000002000000020000000100040000000000000000 000000000000000000000000000000000000000000ffffff00fefefe0000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000000000 0000001202af0801010000040000002701ffff030000000000 } </code></pre> <p>I've been reading the <a href="http://www.microsoft.com/downloads/details.aspx?FamilyId=DD422B8D-FF06-4207-B476-6B5396A18A2B&amp;displaylang=en" rel="nofollow noreferrer">RTF specification</a>, and it looks like you can specify that the image is a JPEG, but since WordPad always converts images to WMF, I can't see an example of an embedded JPEG. So I may also end up needing to transcode from JPEG to WMF or something....</p> <p>But basically, I'm looking for how to generate the binary or hexadecimal (Spec, p.148: "These pictures can be in hexadecimal (the default) or binary format.") form of a JPEG given a file URL.</p> <p>Thanks!</p> <hr> <p><strong>EDIT:</strong> I have the stream stuff working all right, I think, but still don't understand exactly how to encode it, because whatever I'm doing, it's not RTF-readable. E.g., the above picture instead comes out as:</p> <pre><code>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 </code></pre> <p><a href="http://www.phprtf.com/" rel="nofollow noreferrer">This PHP library</a> would do the trick, so I'm trying to port the relevant portion to Java. Here is is: </p> <pre><code>$imageData = file_get_contents($this-&gt;_file); $size = filesize($this-&gt;_file); $hexString = ''; for ($i = 0; $i &lt; $size; $i++) { $hex = dechex(ord($imageData{$i})); if (strlen($hex) == 1) { $hex = '0' . $hex; } $hexString .= $hex; } return $hexString; </code></pre> <p>But I don't know what the Java analogue to <code>dechex(ord($imageData{$i}))</code> is. :( I got only as far as the <code>Integer.toHexString()</code> function, which takes care of the <code>dechex</code> part....</p> <p>Thanks all. :)</p>
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