Hi,
>> id3lib is a C++ library. I would like to create PHP objects to directly
>> interface to the C++ classes within the library. I found the PHP docs about
>> developing extensions to be very sparse, and directed mainly for PHP 3. Is
>> there anywhere which has proper docs dealing with PHP 4? I've found the API
>> docs at Zend, but there doesn't seem to be a way of downloading them (this
>> is a requirement for me).
>
> I currently have a .zip with the Zend docs at my site, you can get it from
> there:
>
> http://docs.2good.nu/tmp/zend.zip
I'd love to get them, but the URL required a user name & password. Maybe
you should move the file somewhere else?
>> This library being C++, does its own memory allocation. Should I worry and
>> try to write operator new() and operator delete() replacements and
>> static-link the library, or just not bother and use the library as is?
>
> I believe you just use the existing new and delete operators, just make
> sure you don't leak memory. Let's hear what others say on php-dev.
That's good to hear.
>> Another thing is garbage collection. How can I get PHP to tell me to free
>> the memory dealing with my objects when they get cleaned up? Do I need to
>> record all allocations and free things in my PHP_RSHUTDOWN function?
>
> This is a good question. :-)
>
> I think I have solved this by having a pointer to the C++ class instance
> stored as a resource connected to the PHP object and then deleting the C++
> class instance on resource destruction.
>
> I looked at the COM extension to find out this. Hopefully you'll get more
> info on php-dev.
I found out about resources, and am using those at the moment. I haven't
thought about attaching those to objects yet. Thanks for the idea. How
exactly do I go about that though? I guess I'll peek at the COM extension
as well.
>> Not only is this my first PHP extension, but it is also my first proper
>> Linux project. I've been programming C/C++ on Mac for a good few years, and
>> programming PHP for over a year now. I know roughly how the build process
>> works, but I'm sure there are more things I should know. Does anyone have
>> suggestions on books to buy that would cover programming non-GUI programs
>> and libraries, and the build process (building configure scripts and
>> Makefiles)?
>
> For learning automake/autoconf I suggest you download this too from my
> site:
>
> http://docs.2good.nu/tmp/autobook-1.0.tar.gz
Same as above, password.
> And of course you should get the make/automake/autoconf references from
> gnu.org.
Got those. I need some time to read them now. ;-)
> About your question about undefined symbols I know I have had the same
> problem, but I cannot recall the solution at the moment, sorry.
I found out from the MySQL extension how to do that. You need to do some
stuff with the [extname]_SHARED_LIBADD variable. I'm not quite sure if
that's just dynamically linking the library, of if it gets statically
linked.
> I could also try to answer any other questions you might have about PHP
> extension development in C++.
>
> Currently I am writing an extension called Universe. This extension is a
> PHP interface to MICO (a C++ CORBA ORB). It will replace my earlier
> Satellite extension which uses ORBit (a C ORB).
Sounds interesting. I haven't taken the time to learn CORBA, and I don't
even know what it's used for. Maybe you could clear me up?
> Universe includes a "framework" for easy creation of PHP classes in C++
> but it's quite specialized for my needs.
I'm hoping to make my ID3 extension simple enough not to require such a
framework, but I might supply a few classes as examples and to simplify the
mid-level interface to a much higher level.
> By the way, have you thought about thread safety...? That's not easy
> either...
Supposedly id3lib is thread-safe. I haven't tested this though. All I'm
doing is calling id3lib and doing a few basic conversions. One things that
worries me is the resources. Does the Zend engine do its own locking when
you add things to resources?
Thanks for the help,
PS: I took this back onto PHP-DEV, I hope you don't mind.
--
.-. Chris Boot
/v\ [EMAIL PROTECTED]
// \\
/( )\ L I N U X
^^-^^ >Phear the Penguin<
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