Groups > comp.lang.java.programmer > #8559

Re: DataInputStream

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!newsfeed.utanet.at!newscore.univie.ac.at!aconews-feed.univie.ac.at!aconews.univie.ac.at!not-for-mail
Newsgroups	comp.lang.java.programmer
From	Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at>
Subject	Re: DataInputStream
References	<1418dd7f-d5d1-4a2c-b77b-87666f6a9591@k15g2000yqd.googlegroups.com> <9f2a8cFh1nU1@mid.individual.net> <6cf66421-77a9-4088-b810-3bcc958cc8ca@i28g2000yqn.googlegroups.com>
Reply-To	avl@logic.at
User-Agent	slrn/pre0.9.9-111 (Linux)
Mime-Version	1.0
Content-Type	text/plain; charset=us-ascii
Content-Transfer-Encoding	7bit
Message-ID	<slrnj8o4bu.6gl.avl@gamma.logic.tuwien.ac.at> (permalink)
Date	05 Oct 2011 08:12:46 GMT
Lines	31
NNTP-Posting-Host	gamma.logic.tuwien.ac.at
X-Trace	1317802366 tunews.univie.ac.at 11354 128.130.175.3
X-Complaints-To	abuse@tuwien.ac.at
Xref	x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:8559

Show key headers only | View raw

bob <bob@coolgroups.com> wrote:
> 	float[] getVertices3(String filename) {
> 		try {
> 			AssetManager am = this.getResources().getAssets();
> 			InputStream is = am.open(filename);
> 			DataInputStream dis = new DataInputStream(is);
> 			int numfloats=dis.readInt();
> 			float[] floatArray = new float[numfloats];
> 			for (int ctr = 0; ctr < floatArray.length; ctr++) {
> 				floatArray[ctr] = dis.readFloat();
> 			}
> 			return floatArray;

Are you aware, that the DataInputStream expects a particular *binary* 
format of data coming from the stream?

If the data stored in the file that you use still contains the same
textual representation as for your previous questions, then
DataInputStream won't be able to read it properly.

You might create a separate converter utility, that reads in your
textfile (with StreamTokenizer), then creates a binary file (writing
out size and the individual floats through a DataOutputStream.
That may seem roundabout, but is just right, if you *casually* need
to hand-edit the text-file, but want speed-improved reading into your
main application.

Another option could be reading the float[] as a single object from
an ObjectInputStream. Again. the data for that must have been created
before by writing such an array to an ObjectOutputStream.

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

DataInputStream bob <bob@coolgroups.com> - 2011-10-04 22:34 -0700
  Re: DataInputStream Robert Klemme <shortcutter@googlemail.com> - 2011-10-05 08:02 +0200
    Re: DataInputStream bob <bob@coolgroups.com> - 2011-10-04 23:17 -0700
      Re: DataInputStream Robert Klemme <shortcutter@googlemail.com> - 2011-10-05 00:07 -0700
        Re: DataInputStream bob <bob@coolgroups.com> - 2011-10-05 07:17 -0700
          Re: DataInputStream markspace <-@.> - 2011-10-05 08:27 -0700
          Re: DataInputStream Patricia Shanahan <pats@acm.org> - 2011-10-05 08:38 -0700
          Re: DataInputStream Robert Klemme <shortcutter@googlemail.com> - 2011-10-05 08:58 -0700
            Re: DataInputStream Lew <lewbloch@gmail.com> - 2011-10-05 14:52 -0700
              Re: DataInputStream Patricia Shanahan <pats@acm.org> - 2011-10-05 15:15 -0700
              Re: DataInputStream Robert Klemme <shortcutter@googlemail.com> - 2011-10-06 00:11 -0700
                Re: DataInputStream Lew <lewbloch@gmail.com> - 2011-10-06 07:08 -0700
                Re: DataInputStream Patricia Shanahan <pats@acm.org> - 2011-10-06 07:49 -0700
          Re: DataInputStream Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-10-05 21:16 -0400
      Re: DataInputStream Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-10-05 08:12 +0000
        Re: DataInputStream bob <bob@coolgroups.com> - 2011-10-05 07:12 -0700
  Re: DataInputStream Roedy Green <see_website@mindprod.com.invalid> - 2011-10-06 02:48 -0700

csiph-web