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POHow to send binary data from AS3 through Java to a filesystem?
 

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  1. POHow to send binary data from AS3 through Java to a filesystem?
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    <p>I've got XML data in AS3 that needs to be compressed, validated on my Java Google App Engine servlet then saved to a file in Google Cloud Storage. Later that file will be opened and decompressed by the AS3 client. The process works if I do it with plain XML or text, but if I ByteArray#compress the data, it dies during ByteArray#uncompress with "There was an error decompressing the data". </p> <p>I've tried setting the content type and mime type at various points, as well as encoding with Base64, but every attempt seems to break in a different way and I never get the same XML back that I sent in. Do I need to use multipart? Should I compress on the server? What's the best practice for doing this?</p> <p>Sending the data from AS3:</p> <pre><code>// compress xml using zlib var xml:XML = &lt;contents&gt;&lt;thing&gt;value&lt;/thing&gt;&lt;/contents&gt;; var bytes:ByteArray = new ByteArray(); bytes.writeObject(xml); bytes.position = 0; bytes.compress(); var request:URLRequest = new URLRequest(url); var urlVariables :URLVariables = new URLVariables(); urlVariables.filename = "somefile.bin"; urlVariables.contents = bytes; request.data = urlVariables; request.method = URLRequestMethod.POST; loader = new URLLoader(); loader.load(request); </code></pre> <p>Receiving it in the Java servlet and creating the file:</p> <pre><code>public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException { String filename = req.getParameter("filename"); byte[] contents = req.getParameter("contents").getBytes(); GSFileOptionsBuilder optionsBuilder = new GSFileOptionsBuilder() .setBucket("bucketname") .setKey(filename) .setAcl("public-read") .setMimeType("binary/octet-stream"); AppEngineFile writableFile = fileService.createNewGSFile(optionsBuilder.build()); boolean lockForWrite = true; FileWriteChannel writeChannel = fileService.openWriteChannel(writableFile, lockForWrite); writeChannel.write(ByteBuffer.wrap(contents)); writeChannel.closeFinally(); } </code></pre> <p>Opening the new file in AS3:</p> <pre><code>var url :String = "http://commondatastorage.googleapis.com/bucketname/somefile.bin"; var request:URLRequest = new URLRequest(url); request.method = URLRequestMethod.GET; loader = new URLLoader(); loader.addEventListener(Event.COMPLETE, handleComplete); loader.load(request); protected function handleComplete (event:Event):void { var bytes:ByteArray = new ByteArray(); bytes.writeObject(event.target.data); // dies on this line with "There was an error decompressing the data." bytes.uncompress(); var xml:XML = new XML(new String(bytes)); trace(xml); } </code></pre>
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    1. USSarah Northway
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    1. COmaybe try bytes.position = 0 before you un-compress?
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      1. POHow to send binary data from AS3 through Java to a filesystem?
      1. USThe_asMan
    2. COThanks but didn't help. I tried printing out the value of the bytes just after compressing and again just before decompressing - half the symbols have been replaced by question marks. Must be the encoding, right?
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      1. USSarah Northway
    3. COpossibly, I would look(httpfox) at the data being sent to the server and compair with whats being sent back.
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      1. USThe_asMan
 

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