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Knowing Which Button Was pressed! GTK

GtkWidget *board[x][y];

       

g_signal_connect(G_OBJECT(board[][]), "clicked",///I want to know what [][] they pressed, how could I verify/check this?  

       G_CALLBACK(board_button_pressed), NULL);

       

...

 

typedef struct _identifier{

    int x;

    int y;

}identifier;

 

static void button_clicked_cb(GtkButton *button, gpointer data)

{

    (void)button; /*To get rid of compiler warning*/

    identifier *id = data;

    printf("n id = %d, %dn", id->x, id->y);

    return;

}

....

    identifier id[x*y]; /* Size of x*y of the board*/

    unsigned int counter = 0;

    for (i = 0; i < x; i++)

    {

        for (j = 0; j < y; j++)

        {

            id[counter].x = i;

            id[counter].y = j;

            board[i][j] = gtk_button_new ();

            g_signal_connect(board[i][j], "clicked", G_CALLBACK(button_clicked_cb), &id[counter]);

            counter++;

        }                                                                                                                                                    

    }