Re: Filling a listsore real time

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Sun, 9 Feb 2014 16:13:03 +0100, ldries46 wrote:

> In my program I want a combobox with a liststore that is every time the 
> dialog in which it is called has a different  number of of iters and another 
> value within the iter. In this case the iters are from an array of 
> characters.
> It looks like the Routine Set_Value  or Set_Char is not correct working 
> because I checked the input for Set_Char gchar(ch) gives me the correct 
> Character. append also works correct, I get the correct number of items but 
> the items should be 1, 2, 3, 4, 5, 6, 7, 8, 9 and they are 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0
> 
> n1 := 0;
> for nn in 1 .. max loop
>    if not Grid(x_vak, y_vak).impossible(n1) then
>       ch := CHARACTER'Val(Symbols(n1 ,Set));
>       Set_Char(G_char, gchar(ch));
>       append(CH_List, CH_Iter);
>       Set_Value(CH_List, CH_Iter, 0, G_char);
>    end if;
>    n1 := n1 + 1;
> end loop;
> 
> Can anyone tell me what I am doing wrong.

Set_Value needs a GValue. A GValue object must be initialized, set and
finally unset. E.g. a string with GValue:

   Text : GValue;
   Row : Gtk_Tree_Iter;
   Column : GInt := 0;
begin
   Init (Text, GType_String); -- Initialize value as a string
   Set_String (Text, "Hello"); -- Set value into Text
   Store.Append (Row); -- Add a new row to the list store
   Store.Set_Value (Row, Column, Text); -- Set a cell in the store's row
   Unset (Text); -- Free memory allocated for value

Which can be done in a simpler way without Set_Value. Gtk_List_Store_Record
has a ready-to-use operation for setting strings:

   Row : Gtk_Tree_Iter;
   Column : GInt := 0;
begin
   Store.Append (Row); -- Add new row to the store
   Store.Set (Row, Column, "Hello"); -- Set cell in the row

Caution. This seems broken in GtkAda 3.4. AFAIK it causes memory
corruption.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de