Re: error: invalid uninstantiatable type `<invalid>' in cast to ...

[Димитров Вячеслав <bordimida mail ru>]

On Sun, 26 Oct 2008 21:01:29 +0300, Carlos Pereira <carlao2005 gmail com>  
wrote:

> Is there any difference in the way c++ treats matrices, from how c  
> treats them??
I try to define drops_regras with calloc and code work correctly, but may  
be i don't understand you right:

        GtkWidget ***drops_regras = NULL;
        int j;
        drops_regras = (GtkWidget ***)calloc(MAIN_nregras,  
sizeof(GtkWidget**));
        for(j=0; j < MAIN_nregras; j++)
        {
                drops_regras[j] = (GtkWidget **)calloc(MAIN_narq_ent + 1,  
sizeof(GtkWidget*));
        }

=======================================
Full my example:

void processa_sistema(GtkWidget *widget, gpointer pacote[])
{
        GtkWidget ***drops_regras = (GtkWidget ***)pacote[0];
        printf( "%d\n",  gtk_combo_box_get_active(  
GTK_COMBO_BOX(drops_regras[0][0] ) ) );

}

int main (int argc, char* argv[])
{
        int MAIN_nregras = 6;
        int MAIN_narq_ent = 3;
        gtk_init (&argc, &argv);

        GtkWidget *main_table = gtk_table_new(MAIN_nregras, MAIN_narq_ent,  
true);
        GtkWidget ***drops_regras = NULL;
        int j;
        drops_regras = (GtkWidget ***)calloc(MAIN_nregras,  
sizeof(GtkWidget**));
        for(j=0; j < MAIN_nregras; j++)
        {
                drops_regras[j] = (GtkWidget **)calloc(MAIN_narq_ent + 1,  
sizeof(GtkWidget*));
        }
        GtkAttachOptions gtk_attach_options_x;
        GtkAttachOptions gtk_attach_options_y;
        int coluna, linha;

        for(coluna=0; coluna < MAIN_narq_ent + 1; coluna++)
        {
                for(linha=0; linha < MAIN_nregras; linha++)
                {
                        drops_regras[linha][coluna] = gtk_combo_box_new();
                        gtk_table_attach(GTK_TABLE(main_table),
                                GTK_WIDGET(drops_regras[linha][coluna]),
                                coluna + 1,
                                coluna + 2,
                                linha + 1,
                                linha + 2,
                                gtk_attach_options_x,
                                gtk_attach_options_y,
                                1, 5);
                }
        }

        gpointer pacote2[1];
        pacote2[0] = drops_regras;

        GtkWidget *button = gtk_button_new_with_label ("Press");
        g_signal_connect(G_OBJECT(button), "clicked",
                G_CALLBACK(processa_sistema), pacote2);
        GtkWidget* vbox = gtk_vbox_new (FALSE, 0);

        GtkWidget *main_window = create_window ();
        gtk_box_pack_start (GTK_BOX (vbox), GTK_WIDGET (main_table), TRUE,  
TRUE, 0);
        gtk_box_pack_start (GTK_BOX (vbox), GTK_WIDGET (button), TRUE,  
TRUE, 0);
        gtk_container_add (GTK_CONTAINER (main_window), vbox);

        gtk_widget_show_all (main_window);

        gtk_main ();
}

--

Dimitrov V.