Allegro does not perform anything graphic

Question

It simply does not appear anything graphic, the functional (close the window) works perfectly, but the graphic (background color and "ship") do not work.

#include <allegro5\allegro.h>
#include <allegro5\allegro_native_dialog.h>
#include <allegro5\allegro_primitives.h>
#include "objetos.h"

const int height = 800;
const int width = 600;

void InitNave(NaveEspacial &nave);
void DesenhaNave(NaveEspacial &nave);


int main(void)
{
        ALLEGRO_DISPLAY *display = NULL;
        ALLEGRO_EVENT_QUEUE *fila_eventos = NULL;

        bool end = false;

        NaveEspacial nave;

        if(!al_init())
        {
                al_show_native_message_box(NULL, "AVISO!", NULL, "FALHA AO CARREGAR ALLEGRO", NULL, NULL);
                return -1;
        }

        display = al_create_display(height, width);

        al_init_primitives_addon();

        fila_eventos = al_create_event_queue();

        al_register_event_source(fila_eventos, al_get_display_event_source(display));

        if(!display)
        {
                al_show_native_message_box(NULL, "AVISO!", NULL, "FALHA AO CARREGAR O DISPLAY", NULL, NULL);
                return -1;
        }

        InitNave(nave);

        while(!end)
        {
                ALLEGRO_EVENT ev;
                al_wait_for_event(fila_eventos, &ev);

                if(ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
                {
                        end = true;
                }

                DesenhaNave(nave);

                al_flip_display;
                al_clear_to_color(al_map_rgb(0, 0, 0));
        }

        al_destroy_display(display);
        al_destroy_event_queue(fila_eventos);

        return 0;
}

void InitNave(NaveEspacial &nave)
{
        nave.x = 20;
        nave.y = height / 2;
        nave.ID = JOGADOR;
        nave.vidas = 3;
        nave.velocidade = 7;
        nave.borda_x = 6;
        nave.borda_y = 7;
        nave.pontos = 0;
}
void DesenhaNave(NaveEspacial &nave)
{
        al_draw_filled_rectangle(nave.x, nave.y - 9, nave.x + 10, nave.y - 7, al_map_rgb(255, 0, 0));
        al_draw_filled_rectangle(nave.x, nave.y + 9, nave.x + 10, nave.y + 7, al_map_rgb(255, 0, 0));
        al_draw_filled_triangle(nave.x - 12, nave.y - 17, nave.x + 12, nave.y, nave.x - 12, nave.y + 17, al_map_rgb(0, 255, 0));
        al_draw_filled_rectangle(nave.x - 12, nave.y - 2, nave.x + 15 , nave.y + 2, al_map_rgb(0, 0, 255));
}

Answer 1

You have forgotten the parentheses in al_flip_display(). So the display will never be updated with each iteration (And you will never see the ship (Nothing)).