Re: [Vala] Manual VAPI writing

[Andrea Del Signore <sejerpz tin it>]

On Tue, 2010-06-29 at 19:17 +0100, Harry Van Haaren wrote:
> Hey all,

Hi Harry,


> I'm attempting to learn how to write .vapi files manually. I've looked
> trough
> the Jack binding, the GTK+ binding and the sfml bindings.
>
> Yet im stumped as to how to write a wrapper for the dead-simple function
> (declared in a file called bindMe.h):
>
> *int add (int a, int b)
> {
>      return (a + b);
> }*
>
> In my attempt I've tried the following:
>
> *[CCode (cheader_filename="bindMe.h")]
> namespace Math
> {
>     public class AddStuff
>     {
>         public AddStuff();
>
>         [CCode (cname="add")]
>         public static int add (int a, int b);
>     }
> }*

if your intent is to bind ad use the add function your binding it's
quite right, but can be simpler:

[CCode (cheader_filename="bindMe.h")]
namespace Math
{
        [CCode (cname="add")]
        public static int add (int a, int b);
}

as you can see in Vala you don't need any class and you can declare a
static method even in a namespace. You can even omit the static since is
implicit, but I usually keep it.

> And to see if the binding worked had a .vala file (test.vala) which contains
> the following:
> *int main()
> {
>     var func = new Math.AddStuff();
>     return 0;
> }*

This is wrong, or I haven't really understand what are you trying to
achieve.

Here it is what I think you want to do:

public static int main()
{
    var func = Math.add(1,2);
    return 0;
}

> Hope somebody can help me learn how to write bindings,I'm eyeing up some
> nice audio libraries.. ;-)  -Harry

Hope this helps.

Regards,
        Andrea