ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Working with byte arrays
// read compressed file to offset 0 of bytes; for uncompressed files
// the compressed and uncompressed size is the same
if (compSize == 0) continue;
zStream.readBytes(bytes, 0, compSize);
Next, the example uncompresses the compressed file and calls the outfile() function to write it to the output file
stream. It passes outfile() the file name and the byte array containing the file data.
if (compMethod == 8) // if file is compressed, uncompress
{
bytes.uncompress(CompressionAlgorithm.DEFLATE);
}
outFile(fileName, bytes); // call outFile() to write out the file
In the previously mentioned example, bytes.uncompress(CompressionAlgorithm.DEFLATE) will work only in
AIR applications. To get deflated data uncompressed for both AIR and Flash Player, invoke ByteArray’s inflate()
function.
The closing braces indicate the end of the while loop, and of the init() method and the Flex application code, except
for the outFile() method. Execution loops back to the beginning of the while loop and continues processing the next
bytes in the .zip file—either extracting another file or ending processing of the .zip file if the last file has been processed.
} // end of while loop
} // for Flex version, end of init() method and application
The outfile() function opens an output file in WRITE mode on the desktop, giving it the name supplied by the
filename parameter. It then writes the file data from the data parameter to the output file stream (outStream) and
closes the file.
// Flash version
function outFile(fileName:String, data:ByteArray):void
{
var outFile:File = File.desktopDirectory; // destination folder is desktop
outFile = outFile.resolvePath(fileName); // name of file to write
var outStream:FileStream = new FileStream();
// open output file stream in WRITE mode
outStream.open(outFile, FileMode.WRITE);
// write out the file
outStream.writeBytes(data, 0, data.length);
// close it
outStream.close();
}
private function outFile(fileName:String, data:ByteArray):void
{
var outFile:File = File.desktopDirectory; // dest folder is desktop
outFile = outFile.resolvePath(fileName); // name of file to write
var outStream:FileStream = new FileStream();
// open output file stream in WRITE mode
outStream.open(outFile, FileMode.WRITE);
// write out the file
outStream.writeBytes(data, 0, data.length);
// close it
outStream.close();
}
Last updated 6/6/2012
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