Flash Air ActionScript3 二进制数据写入文件

package
{
import flash.display.Sprite;
import flash.events.NetStatusEvent;
import flash.filesystem.File;
import flash.filesystem.FileMode;
import flash.filesystem.FileStream;
import flash.media.Video;
import flash.net.FileReference;
import flash.net.NetConnection;
import flash.net.NetStream;
import flash.utils.ByteArray;

public class TestAir extends Sprite
{
private var f:File;
private var fs:FileStream;

public function TestAir()
{
f = File.desktopDirectory.resolvePath("test.flv");
fs = new FileStream();

fs.open(f, FileMode.APPEND);

var data:ByteArray = new ByteArray();
data.writeByte(1);
data.writeByte(2);
data.writeByte(3);

fs.writeBytes(data);

fs.close();
}
}
}