Thank you very much Frederik for your valuable answers I think it is very clear
to me now & I'm waiting for Vala quick start tutorial for Java programmers to
have comprehensive knowledge :-D
Best regards ,
> Date: Sat, 14 Nov 2009 11:26:36 +0100
> From: [email protected]
> To: [email protected]
> Subject: Re: [Vala] Vala & concerned issues !!
>
> Emad Al-Bloushi wrote:
> > Peace be upon you all,
> >
> > I'm new to Vala programming language and I have well experience in Java &
> > PHP programming languages using OOP , honestly I'm little bit concerned
> > about list of issues I hope you can help me to reach the right direction as
> > listed below :
> >
> > 1) How can I list installed packages to compile my code "pango , cairo
> > , gtk+-2.0 ..etc" and where are they installed (I'm using ubuntu 9.10) ?
>
> Here you can find the installed Vala bindings:
>
> ls /usr/share/vala/vapi/ (or /usr/local/share/vala/vapi/ if you have
> installed from source)
>
> In order to use a library you must have the library and its development files
> installed.
> On Ubuntu, for example:
>
> 'libgtk-2.0-0' and 'libgtk-2.0-dev'
> 'libclutter-2.0-0' and 'libclutter-2.0-dev'
> ...
>
> > 2) I have never developed applications with programming languages that
> > use pointers !! so in Vala where to start to understand pointers and to
> > keep my applications safe from memory leaks ?
>
> Use pointer syntax (*, ->, delete) if you want to do manual memory management.
> Instead of
>
> Foo foo = new Foo ();
> foo.method ();
> // object freed automatically
>
> you can alternatively do:
>
> Foo* foo = new Foo (); // allocate object
> foo->method (); // access member
> delete foo; // free object
>
> Use it only if you really want to have full control.
>
> > 3) Using pointers in Vala is it a must ?
>
> No, it's best to avoid them. ('void*' can be an exception. For example, a
> thread
> function is expected to have a 'void*' return value, which basically means
> anything
> can be returned. However, I'd just return 'null'.)
>
> > 4) Where should I start to know more about using binding libraries ?
>
> Using bindings is easy: just pass '--pkg xyz-1.0' to the compiler.
>
> If you want to create your own bindings there are two options:
>
> * if it's a GObject based library then you can semi-automatically generate
> the
> bindings: http://live.gnome.org/Vala/Bindings
> * otherwise you must write the '.vapi' file by hand.
>
> http://mike.trausch.us/blog/2009/02/18/vala-bindings-for-non-gobject-type-c-libraries/
>
> > 5) What version of unicode does Vala support ?
>
> Strings are UTF-8 encoded.
>
> > 6) owned, unowned, and weak modifiers I do not know how can I use them
> > & why ?
>
> The "Memory Management" section of the "Vala for C# Programmers" tutorial
> explains
> some of it:
> http://live.gnome.org/Vala/QuickIntroForCSharpProgrammers#head-0d70172d9170f2aad9365e747aceaae818c99697
>
> By the way, I'm working on a similar Vala quick start tutorial for Java
> programmers
> and will put it online within the next days.
>
> > finally , I have developed a simple snippet to demonstrate how to use
> > Google AJAX API in Vala but I did not use any thread in my code so I'm
> > forced to use "--thread" to run my code perfectly I do not know why ?
>
> I guess libsoup depends on threading support.
>
> > Best regards,
> >
> > Emad Al-Bloushi
>
> Best regards,
>
> Frederik
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