Help with Object Streams and object array...

[Tim]

Thanks for looking.

I am, as the group suggests, getting.started in java.

I trying to read & write an array of objects via the ObjectStream, and have
had problems with multiple items. My coding has been based on these
assumtions:

#1: Writing each element of the object array sequentially to the
outputstream will work.

#2: I can read objects back from an inputstream until the streams
..available() returns something less than 1.


Are these right? Anything in particular I should know about the behavior of
the ObjectXXXStream and reading or writing objects?


Thanks in advance,
Tim

[Kyle Gabhart]

"Tim" <TC225@cornwell.edu> wrote:
>Thanks for looking.
>
>I am, as the group suggests, getting.started in java.
>
>I trying to read & write an array of objects via the ObjectStream, and have
>had problems with multiple items. My coding has been based on these
>assumtions:
>
>#1: Writing each element of the object array sequentially to the
>outputstream will work.
>
>#2: I can read objects back from an inputstream until the streams
>..available() returns something less than 1.
>
>
>Are these right? Anything in particular I should know about the behavior
of
>the ObjectXXXStream and reading or writing objects?
>
>
>Thanks in advance,
>Tim

Tim,

You have to flush the ObjectOutputStream everytime after you send it.

os.writeObject(obj);
os.flush();

If that doesn't do the trick, try resetting the stream before writing another
object:

os.writeObject(obj);
os.flush();
os.reset();

Cordially,

Kyle Gabhart
DevX Java Pro
-------------
http://www.gabhart.com

[Tim]

Thanks for the reply.

I managed to overcome most of the trouble I had, but I still have a
question...

When reading from an ObjectInputStream, how does one tell when the stream
ends/closes?

I get an EOFException, but is there another/better way?

TIA,
Tim C.



"Kyle Gabhart" <kyle@gabhart.com> wrote in message
news:3cbe3cd1@10.1.10.29...
>
> "Tim" <TC225@cornwell.edu> wrote:
> >Thanks for looking.
> >
> >I am, as the group suggests, getting.started in java.
> >
> >I trying to read & write an array of objects via the ObjectStream, and
have
> >had problems with multiple items. My coding has been based on these
> >assumtions:
> >
> >#1: Writing each element of the object array sequentially to the
> >outputstream will work.
> >
> >#2: I can read objects back from an inputstream until the streams
> >..available() returns something less than 1.
> >
> >
> >Are these right? Anything in particular I should know about the behavior
> of
> >the ObjectXXXStream and reading or writing objects?
> >
> >
> >Thanks in advance,
> >Tim
>
> Tim,
>
> You have to flush the ObjectOutputStream everytime after you send it.
>
> os.writeObject(obj);
> os.flush();
>
> If that doesn't do the trick, try resetting the stream before writing
another
> object:
>
> os.writeObject(obj);
> os.flush();
> os.reset();
>
> Cordially,
>
> Kyle Gabhart
> DevX Java Pro
> -------------
> http://www.gabhart.com
>
>
>

[Soft Solution System Limited]

you add a counter in the beginning of the file to control the number of
object behind to be read.


"Tim" <TC225@cornwell.edu> ¼¶¼g©ó¶l¥ó news:3cbeca1f$1@10.1.10.29...
> Thanks for the reply.
>
> I managed to overcome most of the trouble I had, but I still have a
> question...
>
> When reading from an ObjectInputStream, how does one tell when the stream
> ends/closes?
>
> I get an EOFException, but is there another/better way?
>
> TIA,
> Tim C.
>
>
>
> "Kyle Gabhart" <kyle@gabhart.com> wrote in message
> news:3cbe3cd1@10.1.10.29...
> >
> > "Tim" <TC225@cornwell.edu> wrote:
> > >Thanks for looking.
> > >
> > >I am, as the group suggests, getting.started in java.
> > >
> > >I trying to read & write an array of objects via the ObjectStream, and
> have
> > >had problems with multiple items. My coding has been based on these
> > >assumtions:
> > >
> > >#1: Writing each element of the object array sequentially to the
> > >outputstream will work.
> > >
> > >#2: I can read objects back from an inputstream until the streams
> > >..available() returns something less than 1.
> > >
> > >
> > >Are these right? Anything in particular I should know about the
behavior
> > of
> > >the ObjectXXXStream and reading or writing objects?
> > >
> > >
> > >Thanks in advance,
> > >Tim
> >
> > Tim,
> >
> > You have to flush the ObjectOutputStream everytime after you send it.
> >
> > os.writeObject(obj);
> > os.flush();
> >
> > If that doesn't do the trick, try resetting the stream before writing
> another
> > object:
> >
> > os.writeObject(obj);
> > os.flush();
> > os.reset();
> >
> > Cordially,
> >
> > Kyle Gabhart
> > DevX Java Pro
> > -------------
> > http://www.gabhart.com
> >
> >
> >
>
>