Re: Problem with AtkText get_text offset arguments

[Ashutosh Sharma <ashusharma1980 yahoo co uk>]

That solved the problem Padraig. Thanks.

Warm regards,
Ashutosh

----- Original Message ----- 
From: "padraig o'briain" <Padraig Obriain Sun COM>
To: "Ashutosh Sharma" <ashusharma1980 yahoo co uk>
Cc: <gnome-accessibility-list gnome org>
Sent: Tuesday, February 10, 2004 2:13 PM
Subject: Re: Problem with AtkText get_text offset
arguments


Ashutosh,

The text returned by my_image_get_text() should be
freeable by a call to
g_free. Thus, you should return g_strdup (messg).

The convention is that if a function, e.g.
atk_object_get_name() retuyrns a
G_CONST gchar* then the value should not be freed. If
the function returns
just a gchar* the return value can be freed and
probably will be to avoid a
memory leak.

If this is not the cause of the problem can you send
me a stack trace of the
crash.

Padraig

Ashutosh Sharma wrote:
>
> Hi,
>
> I have defined a type implementing the AtkText
> interface. I have implemented only get_text() and
> get_character_count() for now. When atk_get_text
gets
> called, the arguments start_offset is 0 and
end_offset
> is -1. And if I try to return anything non-NULL, it
> crashes with a segmentation fault when I try to poke
> it with at-poke.
> What am I doing wrong? Do I have to implement the
> other functions too? What would be the minimal
> implementation required for it to work?
>
> When I poke the object, my_image_get_text() gets
> called first and then my_image_get_character_count.
Is
> this okay?
>
> Its atk_text_interface_init, the implementation of
the
> functions and the debugging output are as follows:
> ____________________________________________________
>
> static void atk_text_interface_init (AtkTextIface
> *iface)
> {
>   fprintf(stderr, "Function:
> atk_text_interface_init\n");
>
>   g_return_if_fail (iface !=ULL);
>
>   iface->get_text =y_image_get_text;
>   iface->get_character_count =
> my_image_get_character_count;
> }
> ____________________________________________________
>
> static gchar messg[] =Hello back there!";
>
> static gchar* my_image_get_text(AtkText *text, gint
> start_offset, gint end_offset)
> {
>         fprintf(stderr, "Function:
> my_image_get_text\n");
>         fprintf(stderr, "(my_image_get_text)
Request:
> start=, end=\n", start_offset, end_offset);
>         fprintf(stderr, "(my_image_get_text) AtkText
> *text =u\n", text);
>         if(start_offset > end_offset)
>                 return NULL;
>         return messg;
> }
>
> static gint my_image_get_character_count (AtkText
> *text)
> {
>         gint textlen;
>
>         fprintf(stderr, "Function:
> my_image_get_character_count\n");
>         textlen =trlen(messg);
>         fprintf(stderr,
> "(my_image_get_character_count) Returning textlen =
> %d\n", textlen);
>
>         return textlen;
> }
> ____________________________________________________
>
> Debugging output:
>
> Function: my_image_factory_class_init
> Function: my_image_factory_create_accessible
> (my_image_factory_create_accessible) widget =
> 135363816
> Function: my_image_new
> Function: my_image_get_type
> Function: my_image_class_init
> Function: atk_text_interface_init
> Function: my_image_instance_init
> Function: my_image_get_text
> (my_image_get_text) Request: start= end=
> (my_image_get_text) AtkText *text =35364608
> Function: my_image_get_character_count
> (my_image_get_character_count) Returning textlen =7
> ____________________________________________________
>
> Thanks.
>
> Regards,
> Ashutosh
>
>
>
>
>
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