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| Problematic timer code |
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agonvs
Member #15,917
March 2015
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Getting the following error message (though it compiles fine): Unhandled exception at 0x77764c16 in shell.exe: 0xC0000005: Access violation reading 1#include<allegro5/allegro.h>
2#include<allegro5/allegro_primitives.h>
3#include<iostream>
4using namespace std;
5ALLEGRO_EVENT_QUEUE* event_queue;
6
7void render()
8{
9 cout << endl;
10}
11
12enum directions {NONE, NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, NORTHWEST};
13enum buttons {ZERO,ONE,EIGHT,NINE};
14
15int main()
16{
17 ALLEGRO_TIMER *timer;
18 timer = al_create_timer(1.0/60);
19 float gameTime = 0;
20 int frames = 0;
21 int gameFPS = 0;
22 int button;
23 if(!(al_init()))
24 cout << "Couldn't initialize Allegro." << cout;
25 if(!(al_install_joystick()))
26 cout << "Couldn't install joystick." << endl;
27 event_queue = al_create_event_queue();
28 if(!event_queue)
29 cout << "al_create_event_queue failed." << endl;
30
31 al_register_event_source(event_queue, al_get_timer_event_source(timer));
32 al_start_timer(timer);
33 gameTime = al_current_time();
34 al_register_event_source(event_queue, al_get_joystick_event_source());
35 ALLEGRO_JOYSTICK* joy = al_get_joystick(0);
36 ALLEGRO_EVENT_QUEUE *event_queue = NULL;
37
38 ALLEGRO_JOYSTICK_STATE jst;
39 ALLEGRO_EVENT event;
40 directions dir;
41 bool render = false;
42 while(true)
43 {
44 ALLEGRO_EVENT ev;
45 al_wait_for_event(event_queue, &ev);
46 al_get_joystick_state(joy, &jst);
47 if (ev.type == ALLEGRO_EVENT_JOYSTICK_AXIS)
48 {
49 if ((jst.stick[2].axis[0] == 0) && (jst.stick[2].axis[1] == 0))
50 dir = NONE;
51 if ((jst.stick[2].axis[0] == 0) && (jst.stick[2].axis[1] == -1))
52 dir = NORTH;
53 if ((jst.stick[2].axis[0] == 1) && (jst.stick[2].axis[1] == -1))
54 dir = NORTHEAST;
55 if ((jst.stick[2].axis[0] == 1) && (jst.stick[2].axis[1] == 0))
56 dir = EAST;
57 if ((jst.stick[2].axis[0] == 1) && (jst.stick[2].axis[1] == 1))
58 dir = SOUTHEAST;
59 if ((jst.stick[2].axis[0] == 0) && (jst.stick[2].axis[1] == 1))
60 dir = SOUTH;
61 if ((jst.stick[2].axis[0] == -1) && (jst.stick[2].axis[1] == 1))
62 dir = SOUTHWEST;
63 if ((jst.stick[2].axis[0] == -1) && (jst.stick[2].axis[1] == 0))
64 dir = WEST;
65 if ((jst.stick[2].axis[0] == -1) && (jst.stick[2].axis[1] == -1))
66 dir = NORTHWEST;
67
68 }
69 if (ev.type == ALLEGRO_EVENT_JOYSTICK_BUTTON_DOWN)
70 {
71 if (jst.button[0])
72 button = ZERO;
73 if (jst.button[1])
74 button = ONE;
75 if (jst.button[8])
76 button = EIGHT;
77 if (jst.button[9])
78 button = NINE;
79 }
80 else if (ev.type == ALLEGRO_EVENT_TIMER)
81 {
82 render = true;
83 frames++;
84 if (al_current_time() - gameTime >= 1)
85 {
86 gameTime = al_current_time();
87 gameFPS = frames;
88 frames = 0;
89 }
90 }
91 if (render && al_is_event_queue_empty(event_queue))
92 {
93 render = false;
94 cout << "FPS: " << gameFPS << endl;
95 switch (dir)
96 {
97 case NORTH:
98 cout << "NORTH" << endl;
99 case NORTHEAST:
100 cout << "NORTHEAST" << endl;
101 case EAST:
102 cout << "EAST" << endl;
103 case SOUTHEAST:
104 cout << "SOUTHEAST" << endl;
105 case SOUTH:
106 cout << "SOUTH" << endl;
107 case SOUTHWEST:
108 cout << "SOUTHWEST" << endl;
109 case WEST:
110 cout << "WEST" << endl;
111 case NORTHWEST:
112 cout << "NORTHWEST" << endl;
113 }
114 switch (button)
115 {
116 case ZERO:
117 cout << "Button 1 pressed." << endl;
118 case ONE:
119 cout << "Button 2 pressed." << endl;
120 case EIGHT:
121 cout << "Button 9 pressed." << endl;
122 case NINE:
123 cout << "Button 10 pressed." << endl;
124 }
125 }
126 }
127 al_destroy_timer(timer);
128 al_destroy_event_queue(event_queue);
129 return 0;
130}
The compiler is pointing to the line timer = al_create_timer(1.0/60). |
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#00JMP00
Member #14,740
November 2012
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My guess would be, if timer can be a fpu value. |
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l j
Member #10,584
January 2009
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You need to call al_init prior to calling al_create_timer
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