Re: Assuring Compatibility in Stream Objects ?

Two points:
First, there are changes you can make to object definitions while
preserving run-time and serialization compatibility. They're described in
the "Upgrading Deployed Applications" chapter of the Programming Guide.
Look there for details, but basically you can add attributes, but not
delete any or change their types.
Second, you can move from repository to another without breaking
compatibility, so long as you export from the first repository with IDs.
This preserves all of the information needed to preserve run-time
compatibility.
At 08:58 PM 4/22/98 +0900, woo honguk wrote:
hi forte users.
we stored serialized obejects in files using "writeserialiezed" and
"readserialrized" methods.
I already know that any changes about class definition make
the files useless from forte help about "Assuring Compatibility in StreamObjects"
and our experiences.
So, any Changes are not permitted for object compatibility to us.
But I met another problem yesterday.
Without any changes, only a source code migration to new repository
and new deploy made objects in old files to be useless.
I don't know why.
If the objects have UUID and these UUID influence compatiblity,
I guess that a migration from a old respositiry to new changes object's UUID
without any source code changes. Is it right?
If it is right, is there any other options to preserve compatibility
with repository migrations for serialized objects in files ?
any comments appreciated.
honguk woo
in seoul, korea.
Mike Schilling ([email protected]) (510)869-3474
Forte Software, Inc.
The truth is precious - let us conserve it.

I used to serialize the object and inspect the size of
the file.
This way it worked fine for me.
Hope this helps!
Ajith Kallambella M
Forte Systems Engineer,
International Business Corporation.
I am trying to find the size of an object in memory.Can someone tell me
what the best way is?
If I store the object in a MemoryStream, the Size()method return the
total bytes in the stream, but
does this correspond to the size of the object inmemory?
Regards,
Peter Kelly-
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Similar Messages

Assuring Compatibility in Stream Objects ?

hi forte users.
we stored serialized obejects in files using "writeserialiezed" and
"readserialrized" methods.
I already know that any changes about class definition make
the files useless from forte help about "Assuring Compatibility in Stream Objects"
and our experiences.
So, any Changes are not permitted for object compatibility to us.
But I met another problem yesterday.
Without any changes, only a source code migration to new repository
and new deploy made objects in old files to be useless.
I don't know why.
If the objects have UUID and these UUID influence compatiblity,
I guess that a migration from a old respositiry to new changes object's UUID
without any source code changes. Is it right?
If it is right, is there any other options to preserve compatibility
with repository migrations for serialized objects in files ?
any comments appreciated.
honguk woo
in seoul, korea.

A good place to discuss issues with Namoroka 3.6 and Minefield 4 nightly builds and Firefox 4.0 beta builds at the mozillaZine Firefox Builds forum.<br />
You need to register on the mozillaZine forum site in order to post at that forum.
See http://forums.mozillazine.org/viewforum.php?f=23

Does the portal utilizes Internet Explorer's ADODB.Stream object?

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Hi
1. yes , please check for host entries
2. please check with your network team and ask them about whether Port has been opened or firewall or not.
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Same stream object Error

Hi, when I try to open a stream XNET interface I have this error:
Error -1074384882 occurred at XNET Create Session (Frame Input Stream).vi:1
Possible reason(s):
NI-XNET: (Hex 0xBFF6300E) You tried to open the same stream object twice. This is not permitted. Solution: open each stream object only once.
How can I solve this problem?

This error has to do with invalid baud rate. Have you tried to change the baud rate and try again?
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Socket + GZip Stream + Object Stream problem

Hello,
I've been having a problem with my threaded networked application. I want to send GZipped Objects over a socket, but the ObjectInputStream constructor blocks. I understand that it is waiting for header information from the corresponding ObjectOutputStream. I am sure that the socket connection has been established, and the ObjectOutputStream is constructed before the ObjectInputStream on the other end. The header information never seems to get to the other end.
If I remove the Gzip filter stream, everything works great. I'm thinking that the Gzip stream is buffering the 4 bytes of header info, waiting for more data before actually compressing anything. I've tried flushing everything, to no help. I've tried finish()ing the Gzip stream, but that means I can't send my object payload. I've checked the buffers of all the stream objects and see the Object Stream's header in its buffer, but never seems to get into the GZIPOutputStream's buffer.
Has anyone successfully used Object Stream > GZIP Stream > Socket Stream before?
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Dave C

Thanks. I see what I'm doing differently now. I was trying to send multiple objects over the gzip stream, not 1 at a time, finish(), and construct a new Gzip and Object output stream.
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Duplicating stream object to new stream with lower resolution

Hi all generally I have a question, Is it possible for ams to split my original live stream to a new stream but with lower resolution, so i have two streams one with high resolution and one with low resolution?
If not I how does it Adobe Flash Media Live Encoder do? I can steam up to 3 different resolutions from one camera object. Is it possible to do also from flash?
I want to built a multi user conference application. But have some cpu usage issues, so I need a additional lower resolution stream to use for the miniature views.
Could You help me with this, any tips how could I do such a thing?
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Sorry if a similar thread was already published on this forum.

Thx 4 the replay.
So maybe I could do something like this:
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Stream object with reference to its length

Hi,
I have the following pdf file and I cannot see page 1 in Adobe Acrobat Reader. I can see it correctly in any other pdf reader.
I need to create a stream with reference to its length (see object 100 and 200) but I could make it work. I followed the pdf spec (page 65) but it's not working.
in page 2, where the length not a reference object, everything is fine.
Please help.
%PDF-1.5
%þ
1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj
2 0 obj << /Type /Pages /MediaBox [0 0 595 842] /CropBox [0 0 595 842] /Resources 3 0 R /Kids [ 010 0 R 011 0 R ] /Count 2 >> endobj
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6 0 obj << /Length 205 >> stream
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endobj
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BT /FHB 14 Tf 235 750 Td(Page 2)Tj ET
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0 12
0000000000 65535 f
0000000014 00000 n
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0000000198 00000 n
0000000270 00000 n
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0000000837 00000 n
0000000913 00000 n
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0000001035 00000 n
trailer
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startxref
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%%EOF

Here is one example: For a true text file, it does not make a big
difference if your line endings are LF or CR or a combination of both
(which ones are used depends on your operating system and text editor
software used). A good text editor can juggle all these and give you what a
human would consider the correct view of the document. In a PDF file, it
does matter quite a bit if you use LF or CR/LF - the first one only adds
one byte to the file, the second one adds two bytes. Because everything in
the PDF file is referenced via the byte offset from the Xref table, having
a line ending be one vs. two bytes makes a big difference. In one case,
your offsets are correct, in the second one they are not, and therefore the
PDF file is corrupt.
Contrary to what lrosenth says, I believe you can create a PDF file in
NotePad++ (or any other text editor), and I do so regularly in my
trainings, but you have to be absolutely certain you understand how byte
offsets work and how to get them correct. Even though you can do this,
normally you would not (unless it's a training exercise). It's much easier
to write out the PDF file in software and keep track of all byte offsets as
the objects are generated so that you can then create a valid Xref table.
If you want to know more about the potential problems with the Xref table,
see this blog post I wrote a few years ago:
http://khkonsulting.com/2013/01/the-trouble-with-the-xref-table/

Nokia N8 Flash compatibility with streaming video ...

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added:
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Append stream object to existing file

Hello, I'm trying to append a live stream to an existing file, but I cant figure out how to open the existing file and then append the live stream. This is server side as well.
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This is what I have now, and it still overwrites :*(
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Unicode compatibility check of object types(swo1)

Dear all,
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Hello all,
this question has been answered:
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Oracle 10G compatibility with Business Object 6.3.1

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first of all remeber that if you change the sarver name port when you log on on CMC or CCM you have to name the server with the new port in the field system:
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Edited by: Massimo Cappelli on Jun 9, 2011 8:42 AM

Can I have multiple stream types in one object?

For my final project in my data commucnications class I'm writing a client/server socket application that will allow multiple clients to play TicTacToe simultaneously against the game on the server. The teacher is a C/C++ jock, and knows very little Java. We're free to choose any language that will do sockets, and I love Java and don't love C++.
I've built the GUI, and got it to the point that I can reliably connect multiple clients on different machines in the school lab to the Server object, which accepts the new sockets and creates a new thread of ServerGame to do the playing in response to the client's moves. A mousePressed() detects clicks in the grid, and modifies a string to contain the status of the game. I've used a BufferedReader and PrintWriter combination on both sides, to send the GameString back and forth, starting with "---------", then the client makes a move and it changes to "X--------" and the PrintWriter sends it over and the ServerGame makes a move to "X---O----" and send it back, etc, etc. You get the idea. I have a ways to go with the implementation of strategy stuff for the ServerGame's moves, but I like it so far. But now I realize it would be really cool to add to it.
What I want to do, since there can be multiple players, is have a way that it can be like a TicTacToe club. At any one time, it would be nice to be able to know who else is playing and what their won/loss record is. I plan a Player object, with String name, int wins, losses, ties, gets and sets. With Textfields and a Sign In button I should be able to send the Player name to the Server, which can look up the name in a Vector of Player objects , find the one that matches, and sends the Player object for that name over to the Client, and also provide it to the ServerGame. Each player's won/loss record will be updated as the play continues, and the record will be "stored" in the Server's vector when he "logs off". Updates shouldn't be too hard to manage.
So, with that as the description, here's the question -- most streams don't handle Objects. I see that ObjectInputStream and ObjectOutputStream do. So -- am I headed for trouble in using multiple stream objects in an application? I suppose I could just use the object streams and let them send out a serialized String. In other words, I want to add this to my program, but I don't want to lose too much time finding out for myself if it works one way or the other. I already have working code for the String. Without giving too much away, can anyone give me some general guidance here?

Anyway, here's the present roadblock that's eating into the time I have left. I've spent many happy hours looking for what I'm missing here, and I'm stumped, real-time.
I found it was no problem to just send everything over and back with ObjectInputStream and ObjectOutputStream. From the client I send a String with the state of the game, and can break it down and code for decisions in the server as to a response and send the new String back to the client. I now have a Player class with Strings name and password, ints wins, losses, ties. I have a sign-in in the client GUI and old "members" of the club are welcomed and matched with their Player object stored in a Vector, and new members are welcomed and added to the Vector. My idea is to make the Vector static so the clients can have access to the Vector through their individual threads of the Game in the server. That way I should be able to make it so that any one player can have in his client window a TextArea listing who's playing right now, with their won-loss record, and have it updated, real-time.
The problem is that in my test-program for the concept, I can get a Player object to go back and forth, I can make changes in it and send it back and have it display properly at either end after a change. What I'm aiming at in the end is the ability to pass a copy of the Vector object from the server to the client, for updating the status of everyone else playing, and when there's a win or loss in an individual client, it should be able to tell its own server thread and through that update the Vector for all to access. Sounds OK to me, but what's happening is that the Vector that goes into the pipe at the server is not the same as the Vector that comes out the pipe into the client. I've tried all the tricks I can think of using console System.out.println()'s, and it's really weird.
I build a dummy Vector in the constructor with 4 Players. I can send a message to the server that removes elementAt(0), and tell it to list the contents of the Vector there, and sure enough the first element is gone, and the console shows a printout of the contents of all the remaining Player objects and their members. But when I writeObject() back to the client, the whole Vector arrives at the client end. Even after I've removed all the Player elements one by one, I receive the full original Vector in the client. I put it into a local Vector cast from the readObject() method. I believe that should live only as long as the method. I even tried putting clear() at the end of the method, so there wouldn't be anything lingering the next time I call the method that gets the Vector from the server.
What seems the biggest clue is that now I've set up another method and a button for it, that gets the elementAt(0) from the server Vector, changes the name and sends it back. Again, after the regular call to get the Vector sent over, it shows in the server console that one element has been removed. And one by one the element sent over from (0) is the one that was bumped down to fill the space from removeElementAt(). But in the client, the console shows 4 objects in the Vector, and one by one, starting at (0), the Player whose name was changed fills in right up to the top of the Vector.
So something is persisting, and I just can't find it.
The code is hundres of lines, so I hesitate to send it in here. I just hope this somewhat lengthy description tips off someone who might know where to look.
Thanks a lot
F

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Message was edited by: AcroBishop

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Stream to Sound object

Hi,
I have the below snippet
stream = new NetStream(netConnection);
stream.client = this;
stream.play("FILE_NAME");
which basically plays a stream located on my Flash Media
Server.
Instead of playing the flv file with the stream object, I
want to make use of the Sound object , sth. like
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Retreiving more than one object from an object stream using serialization.

I have written a number of object into a file using the object Output stream. Each object was added separately with a button event. Now when I retrieve it only one object is being displayed. the others are not displayed The code for retrieval and inserting is given below. Please do help me.
code for inserting is as follows
Vehicle veh1 and vehicle class implements serializable
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You can read objects from the stream one by one. So, what you need is an endless loop like this:
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// So here is the loop which reads objects from the stream:
Object inObj;
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// ...

Re: Assuring Compatibility in Stream Objects ?

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