hello everyone I have project with c and I must program paint's program and I want to save Allegro's window as image(png,jpg) so How can I save Allegro's window(display window) Like as png or jpg file in Allegro 5 ?
I search so much but I can not find anything useful 
any body know how I can save it ?
I wrote something like this but it does not work
1#include <stdio.h>
2#include <iostream>
3using namespace std;
4#include <allegro5/allegro.h>
5#include "allegro5/allegro_image.h"
6#include <allegro5/allegro_primitives.h>
7BITMAP *buffer;
8int main(int argc, char **argv){
9 int width=640;
10 int height=480;
11 bool done=false;
12 int imageRad=20;
13
14 ALLEGRO_DISPLAY *display = NULL;
15 ALLEGRO_EVENT_QUEUE *event_queue=NULL;
16 ALLEGRO_BITMAP* image=NULL;
17
18 if(!al_init()) {
19 fprintf(stderr, "failed to initialize allegro!\n");
20 return -1;
21 }
22
23 display = al_create_display(width, height);
24 if(!display) {
25 fprintf(stderr, "failed to create display!\n");
26 return -1;
27 }
28 al_install_keyboard();
29 al_init_primitives_addon();
30 image=al_create_bitmap(imageRad*2,imageRad*2);
31
32 al_set_target_bitmap(image);
33
34 al_draw_filled_rectangle(imageRad,imageRad-9,imageRad+10,imageRad-7,al_map_rgb(255,0,0));
35 al_draw_filled_rectangle(imageRad,imageRad+9,imageRad+10,imageRad+7,al_map_rgb(255,0,0));
36 al_draw_filled_triangle(imageRad-12,imageRad-17,imageRad+12,imageRad,imageRad-12,imageRad+17,al_map_rgb(0,255,0));
37 al_draw_filled_rectangle(imageRad-12,imageRad-2,imageRad+15,imageRad+2,al_map_rgb(0,0,255));
38
39 al_set_target_bitmap(al_get_backbuffer(display));
40
41 event_queue=al_create_event_queue();
42 al_register_event_source(event_queue,al_get_keyboard_event_source());
43 while(!done){
44 ALLEGRO_EVENT ev;
45 al_wait_for_event(event_queue,&ev);
46 if(ev.type==ALLEGRO_EVENT_KEY_DOWN){
47 switch(ev.keyboard.keycode){
48 case ALLEGRO_KEY_ESCAPE:
49 done=true;
50 break;
51 }
52 }
53 al_draw_bitmap(image,width/2,height/2,0);
54 al_flip_display();
55 }
56 al_save_bitmap("foto.jpg",image);
57
58 al_clear_to_color(al_map_rgb(0,0,0));
59 al_destroy_bitmap(image);
60 al_destroy_display(display);
61 return 0;
62}
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