My Mistake With readBytes in AIR
Monday 25 August 2008 - Filed under Tips
I was trying to read a specific part of a file in AIR. I thought readBytes function in FileStream can serve the purpose but I was wrong.
public function readBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void
Reads the number of data bytes, specified by the length parameter, from the file stream, byte stream, or byte array. The bytes are read into the ByteArray objected specified by the bytes parameter, starting at the position specified by offset.
The offset parameter is defined as the offset position in bytes. It defines where to store the data in bytes not where FileStream starts to read. The correct way is to move the FileStream.position and specify the length fo data needed.
2008-08-25 » 5566
7 April 2009 @ 10:08 am
Thanks for the blog this helped me a lot…
17 May 2009 @ 6:14 am
Hi there, ive been having a similar problem:
filestream.writeBytes(byteArray, 0 , byteArray.length).
I have been wanting to write the Bytes from say 18000 bytes to the byteArray.length (which is 20000 bytes). Is there a way to do this? i have trieds setting the offset to 18000, but it always returns the index out of range, and what you have outlined above seems to be the same problem.
var f : File = File.desktopDirectory.resolvePath(“stream.mp3″);
var fs : FileStream = new FileStream();
fs.openAsync(f, FileMode.WRITE);
var bArray : ByteArray = new ByteArray();
stream.readBytes(bArray);
fs.writeBytes(_newerBArray, 0, _newerBArray.length);
so i would need to set the fs.position to a position in the bytearray? sorry about all the questions, it just seems no one else has documented this and its driving me a bit mad!
thanks
17 May 2009 @ 6:16 am
sorry, the last line of that code should have read
fs.writeBytes(bArray, 0, bArray.length).