Hi,
I have some trouble with using one C library which is using value-copied
structs inside GLib.Array container. Here is a small piece of code to
illustrate the problem:
x.c
--------------------------------------
#include "x.h"
GArray* get_array() {
GArray *result = g_array_new(FALSE, FALSE, sizeof(Point));
Point a = { 1, 2 };
Point b = { 3, 5 };
g_array_append_val(result, a);
g_array_append_val(result, b);
return result;
}
--------------------------------------
x.h:
--------------------------------------
#include <glib.h>
typedef struct Point_ Point;
struct Point_ {
int x;
int y;
};
GArray* get_array();
--------------------------------------
x.vapi:
--------------------------------------
[SimpleType]
[CCode (cheader_filename = "x.h")]
public struct Point {
public int x;
public int y;
}
[CCode (cheader_filename = "x.h")]
public GLib.Array<Point> get_array();
--------------------------------------
pgm.vala:
--------------------------------------
void main (string[] args)
{
var pts = get_array();
for (int i = 0 ; i < pts.length; i++) {
var p = pts.index(i);
stdout.printf(@"pt: $(p.x), $(p.y)\n");
}
}
--------------------------------------
(compile: "valac -X -I. --vapidir=. --pkg glib-2.0 --pkg x -o pgm pgm.vala x.c")
Now it DOES NOT COMPILE:
x.vapi:9.19-9.23: error: `Point' is not a supported generic type argument,
use `?' to box value types
public GLib.Array<Point> get_array();
^^^^^
But when I change the line in VAPI file to "public GLib.Array<Point?>
get_array();" it DOES COMPILE, but it doesn't work.
The resulting binary segfaults when executed because the generated C file
"thinks" the type in the GLib.Array is "Point*", but it is in fact "Point" -
see the generated C code:
---------------------------------------
void _vala_main (gchar** args, int args_length1) {
GArray* _tmp0_ = NULL;
GArray* pts;
_tmp0_ = get_array ();
pts = _tmp0_;
{
gint i;
i = 0;
{
gboolean _tmp1_;
_tmp1_ = TRUE;
while (TRUE) {
Point* _tmp2_ = NULL;
Point* _tmp3_;
Point* p;
...
_tmp2_ = g_array_index (pts, Point*, (guint) i);
_tmp3_ = __point_dup0 (_tmp2_);
p = _tmp3_;
....
---------------------------------------
I would very much prefer to keep the C library (the example above is only an
example, the real C library is quite large) and solve the problem on the "vala
side".. does anyone have any suggestions?
Thanks for any help.
Regards,
Jan Spurny
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