Michael B. Trausch wrote:
> Also, a question regarding bindings: Do they *have* to be in .vapi
> files, or is it possible to create a class that does something like
> C#/Mono/.NET's P/Invoke?
Hi,
you can define extern methods this way:
[CCode (cheader_filename = "xy.h", lowercase_prefix = "")]
private static extern int foo (string bar);
But I'd recommend writing a vapi file. You can already do a lot of
tricks with vapi files to make the bindings convenient to use in Vala,
like specifying the constructor and free methods or renaming methods.
For example:
------- xlib.vapi ---------
[CCode (cprefix="X", cheader_filename="X11/Xlib.h")]
namespace Xlib {
[Compact]
[CCode (cname = "Display", free_function = "XCloseDisplay")]
public class Display {
[CCode (cname = "XOpenDisplay")]
public Display (string? display_name = null);
[CCode (cname = "XDefaultScreen")]
public int get_default_screen ();
}
}
---------------------------
Example usage:
------- xtest.vala --------
using Xlib;
void main () {
Display display = new Display ();
int screen = display.get_default_screen ();
stdout.printf ("default screen: %d\n", screen);
// display closed by Vala
}
---------------------------
$ valac xtest.vala --pkg xlib --vapidir . -X -lX11
Add the '-C' compiler option if you want to have a look at the generated
C code.
You could still wrap it with your own classes if it's not convenient enough.
Regards,
Frederik
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