Groups > comp.lang.java.programmer > #8592

Re: optional operation

From	bob <bob@coolgroups.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: optional operation
Date	2011-10-05 23:46 -0700
Organization	http://groups.google.com
Message-ID	<a1d9260d-6f6f-456c-a49c-ae8a0bfd2c9a@5g2000yqo.googlegroups.com> (permalink)
References	<5eb0fcba-199f-46e4-b913-2f3e851d89fc@q26g2000vby.googlegroups.com> <c_idnaoeDvisCRHTnZ2dnUVZ_rWdnZ2d@earthlink.com> <6745899f-3c13-4d2b-81fb-52975c560a3b@q24g2000vby.googlegroups.com> <j6in1n$fil$1@dont-email.me> <j6inr7$jms$1@dont-email.me>

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Here's what I tried:

			AssetManager am = this.getResources().getAssets();

			AssetFileDescriptor afd = am.openFd(filename);
			FileInputStream fis = afd.createInputStream();
			FileChannel fchan = fis.getChannel();
			ByteBuffer inBuff = ByteBuffer.allocateDirect( 24121*4 );
			int bytesread = fchan.read( inBuff );

			 FloatBuffer floatBuffer = inBuff.asFloatBuffer();

			   float[] floats = new float[ 24121 ];
			   floatBuffer.get( floats);
			return floats;

However, I always get a BufferUnderflowException at
floatBuffer.get( floats);

10-05 23:37:07.400: ERROR/AndroidRuntime(3570): Caused by:
java.nio.BufferUnderflowException

For some reason, floatBuffer thinks it has a capacity of 0 after it's
created.

Any ideas?












On Oct 5, 6:05 pm, markspace <-@.> wrote:
> On 10/5/2011 3:51 PM, markspace wrote:
>
> > On 10/5/2011 2:20 PM, bob wrote:
> >> Thanks, but I am still confused. How can a buffer not be backed by an
> >> accessible array?
>
> > I would have guessed due to this method here:
>
> > <http://download.oracle.com/javase/6/docs/api/java/nio/ByteBuffer.html...>
>
> > You'll need to read the comments at the begging of that page to
> > understand what it is doing.
>
> Should be "beginning" not begging.  Typing fast, didn't proofread.
>
> Meant to add too that you seemed to have discovered another reason that
> the array would not be accessible --- the Buffer wraps another buffer,
> which is fine.

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Thread

optional operation bob <bob@coolgroups.com> - 2011-10-05 09:49 -0700
  Re: optional operation Patricia Shanahan <pats@acm.org> - 2011-10-05 10:30 -0700
    Re: optional operation bob <bob@coolgroups.com> - 2011-10-05 14:20 -0700
      Re: optional operation markspace <-@.> - 2011-10-05 15:51 -0700
        Re: optional operation markspace <-@.> - 2011-10-05 16:05 -0700
          Re: optional operation bob <bob@coolgroups.com> - 2011-10-05 23:46 -0700
            Re: optional operation Lew <lewbloch@gmail.com> - 2011-10-06 06:47 -0700

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