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Re: Need help with serialization/deserialization interface.

From: Tima
Subject: Re: Need help with serialization/deserialization interface.
Date: Mon, 22 Jan 2007 09:12:17 -0800
User-agent: GNUMail (Version 1.2.0)

Richard and Renauld,

Thank you very much for your help.

Renauld Molla wrote:

but did you check Apple's  "Stream Programming Guide for Cocoa" at

Yes, I read about it before. I did not understand how to (directly) use it for my purpouses.

On 2007-01-22 00:46:07 -0800 Richard Frith-Macdonald <address@hidden> wrote:

NSStream is probably what you want to use, but it provides per-byte I/ O. not per-character I/O. There is no API for per-character I/O, but you could subclass NSStream to add that if you really want it.

Per-byte will be perfectly fine.

NSStream can be used for buffered I/O by chaining together a memory stream and a stream that writes to a device directly.

Yes, it seemed NSStream was what I needed because I can get NSStreams for
file, memory location or socket, and this is what I want.

At the risk of holding your attention for too long, let me share my confusion about NSStream with you. NSInputStream, for instance, has [-read:maxLen:] which in my mind plays the role of select() and read() combination for sockets. I can read the available chunk of data.

This is great, but I need more that that. If I wrote in C, after

   communication_fd = accept(...);

I would call

   FILE * file = fdopen( communication_fd, "r" );

so that later I could use getc(file) and let the standard io library
call read() for me automatically when the next getc() tries to extract
a byte past the end of available data.

Shall I create a similar mechanism on the top of NSInputStream ?
Add [-readByte] to a subclass?

The closest thing to that "byte streams" I found so far was NSScanner,
1. It can be obtained from NSString, I did not find a way to obtain it from
2. It can go back, scan for substrings etc., this is not possible for general
    input stream. I need just "going forward" functionality.

So it's too powerful and because of that too restrictive.
Is there something that provides a stream of bytes and
can get a new chunk behind the scenes?

Thank you,

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