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Beginner's question: How to serialize/materialize an object to/from a ByteArray?

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Chris Muller-3

Beginner's question: How to serialize/materialize an object to/from a ByteArray?

I just noticed 'browse class versions' is still not working with the
new-and-improved SqueakSource prototype because maybe there's a bug
with serializing an object to/from a ByteArray with Squeak?

I had wanted to use MultiByteBinaryOrTextStream to serialize to a
ByteArray, but when I try this:

| ba myObject |
myObject := MethodReference asClassDefinition.
ba := ((ReferenceStream on: (MultiByteBinaryOrTextStream on: ByteArray new))
nextPut: myObject ;
yourself) contents.
(ReferenceStream on: (MultiByteBinaryOrTextStream on: ba)) next

Produces an error: 'The file did not exist in this directory'. Huh?
What file? What directory?

I've only ever used my own serializer since about 2004, which I think
is much better but obviously for in-image stuff I have to use
ReferenceStream.

Any help would be greatly appreciated.

Bob Arning-2

Re: Beginner's question: How to serialize/materialize an object to/from a ByteArray?

Well, this seems to work:

| ba myObject rs |
myObject := MethodReference asClassDefinition.
rs _ ReferenceStream on: (MultiByteBinaryOrTextStream on: ByteArray new).
rs nextPut: myObject.
ba := rs reset; contents.
(ReferenceStream on: (MultiByteBinaryOrTextStream with: ba) reset) next

Cheers,
Bob

On 9/7/13 1:33 PM, Chris Muller wrote:

I just noticed 'browse class versions' is still not working with the
new-and-improved SqueakSource prototype because maybe there's a bug
with serializing an object to/from a ByteArray with Squeak?

I had wanted to use MultiByteBinaryOrTextStream to serialize to a
ByteArray, but when I try this:

| ba myObject |
myObject := MethodReference asClassDefinition.
ba :=  ((ReferenceStream on: (MultiByteBinaryOrTextStream on: ByteArray new))
     nextPut: myObject ;
     yourself) contents.
(ReferenceStream on: (MultiByteBinaryOrTextStream on: ba)) next

Produces an error:  'The file did not exist in this directory'.   Huh?
 What file?  What directory?

I've only ever used my own serializer since about 2004, which I think
is much better but obviously for in-image stuff I have to use
ReferenceStream.

Any help would be greatly appreciated.

David T. Lewis

Re: Beginner's question: How to serialize/materialize an object to/from a ByteArray?

Yes, I think there was recent discussion about inconsistent stream
behavior with regard to #contents.

This also works:

myObject := MethodReference asClassDefinition.
ba := ((ReferenceStream on: ByteArray new writeStream asBinaryOrTextStream)
nextPut: myObject ;
yourself) contents.
(ReferenceStream on: ba readStream) next

So the serializer is ok, the issue relates only to stream positioning.

Dave

On Sat, Sep 07, 2013 at 02:07:41PM -0400, Bob Arning wrote:

> Well, this seems to work:
>
>
> | ba myObject rs |
> myObject := MethodReference asClassDefinition.
> rs _ ReferenceStream on: (MultiByteBinaryOrTextStream on: ByteArray new).
> rs nextPut: myObject.
> ba := rs reset; contents.
> (ReferenceStream on: (MultiByteBinaryOrTextStream with: ba) reset) next
>
> Cheers,
> Bob
>
> On 9/7/13 1:33 PM, Chris Muller wrote:
> >I just noticed 'browse class versions' is still not working with the
> >new-and-improved SqueakSource prototype because maybe there's a bug
> >with serializing an object to/from a ByteArray with Squeak?
> >
> >I had wanted to use MultiByteBinaryOrTextStream to serialize to a
> >ByteArray, but when I try this:
> >
> >| ba myObject |
> >myObject := MethodReference asClassDefinition.
> >ba := ((ReferenceStream on: (MultiByteBinaryOrTextStream on: ByteArray
> >new))
> > nextPut: myObject ;
> > yourself) contents.
> >(ReferenceStream on: (MultiByteBinaryOrTextStream on: ba)) next
> >
> >Produces an error: 'The file did not exist in this directory'. Huh?
> > What file? What directory?
> >
> >I've only ever used my own serializer since about 2004, which I think
> >is much better but obviously for in-image stuff I have to use
> >ReferenceStream.
> >
> >Any help would be greatly appreciated.
> >
> >
>

Bob Arning-2

Re: Beginner's question: How to serialize/materialize an object to/from a ByteArray?

In reply to this post by Chris Muller-3

or, with a little less arcane stuff:

| myObject rs |
myObject := MethodReference asClassDefinition.
rs _ ReferenceStream on: (RWBinaryOrTextStream on: ByteArray new).
rs nextPut: myObject.
(ReferenceStream on: (ReadStream on: rs contents)) next

Cheers,
Bob

On 9/7/13 1:33 PM, Chris Muller wrote:

I just noticed 'browse class versions' is still not working with the
new-and-improved SqueakSource prototype because maybe there's a bug
with serializing an object to/from a ByteArray with Squeak?

I had wanted to use MultiByteBinaryOrTextStream to serialize to a
ByteArray, but when I try this:

| ba myObject |
myObject := MethodReference asClassDefinition.
ba :=  ((ReferenceStream on: (MultiByteBinaryOrTextStream on: ByteArray new))
     nextPut: myObject ;
     yourself) contents.
(ReferenceStream on: (MultiByteBinaryOrTextStream on: ba)) next

Produces an error:  'The file did not exist in this directory'.   Huh?
 What file?  What directory?

I've only ever used my own serializer since about 2004, which I think
is much better but obviously for in-image stuff I have to use
ReferenceStream.

Any help would be greatly appreciated.