Question

I’m making a board like this

GtkWidget *board[x][y];

If I do an array of buttons, how can I know which button was pressed?

Does

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

return which button of the array was pressed? Or do I have to make a separate function for each of the board pieces?

For example:

OOO
OXO
OOO

How to know which button was pressed if all of the buttons are named the same?

Answer 1

One of the simplest way would be to just send the information when you are connecting to the callback as data. Something on these lines:

...

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, %d\n", 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++;
        }                                                                                                                                                     
    }

Please note that "clicked" signal is associated only with GtkButton. If you need to use with GtkWidget then look at "button-press-event" or "button-release-event", in which case the callback signature will also change.
Hope this helps!