1
2 /* Simple program: Loop, watching keystrokes
3 Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to
4 pump the event loop and catch keystrokes.
5 */
6
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10
11 #include "SDL.h"
12
13 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
quit(int rc)14 static void quit(int rc)
15 {
16 SDL_Quit();
17 exit(rc);
18 }
19
print_modifiers(void)20 static void print_modifiers(void)
21 {
22 int mod;
23 printf(" modifiers:");
24 mod = SDL_GetModState();
25 if(!mod) {
26 printf(" (none)");
27 return;
28 }
29 if(mod & KMOD_LSHIFT)
30 printf(" LSHIFT");
31 if(mod & KMOD_RSHIFT)
32 printf(" RSHIFT");
33 if(mod & KMOD_LCTRL)
34 printf(" LCTRL");
35 if(mod & KMOD_RCTRL)
36 printf(" RCTRL");
37 if(mod & KMOD_LALT)
38 printf(" LALT");
39 if(mod & KMOD_RALT)
40 printf(" RALT");
41 if(mod & KMOD_LMETA)
42 printf(" LMETA");
43 if(mod & KMOD_RMETA)
44 printf(" RMETA");
45 if(mod & KMOD_NUM)
46 printf(" NUM");
47 if(mod & KMOD_CAPS)
48 printf(" CAPS");
49 if(mod & KMOD_MODE)
50 printf(" MODE");
51 }
52
PrintKey(SDL_keysym * sym,int pressed)53 static void PrintKey(SDL_keysym *sym, int pressed)
54 {
55 /* Print the keycode, name and state */
56 if ( sym->sym ) {
57 printf("Key %s: %d-%s ", pressed ? "pressed" : "released",
58 sym->sym, SDL_GetKeyName(sym->sym));
59 } else {
60 printf("Unknown Key (scancode = %d) %s ", sym->scancode,
61 pressed ? "pressed" : "released");
62 }
63
64 /* Print the translated character, if one exists */
65 if ( sym->unicode ) {
66 /* Is it a control-character? */
67 if ( sym->unicode < ' ' ) {
68 printf(" (^%c)", sym->unicode+'@');
69 } else {
70 #ifdef UNICODE
71 printf(" (%c)", sym->unicode);
72 #else
73 /* This is a Latin-1 program, so only show 8-bits */
74 if ( !(sym->unicode & 0xFF00) )
75 printf(" (%c)", sym->unicode);
76 else
77 printf(" (0x%X)", sym->unicode);
78 #endif
79 }
80 }
81 print_modifiers();
82 printf("\n");
83 }
84
main(int argc,char * argv[])85 int main(int argc, char *argv[])
86 {
87 SDL_Event event;
88 int done;
89 Uint32 videoflags;
90
91 /* Initialize SDL */
92 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
93 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
94 return(1);
95 }
96
97 videoflags = SDL_SWSURFACE;
98 while( argc > 1 ) {
99 --argc;
100 if ( argv[argc] && !strcmp(argv[argc], "-fullscreen") ) {
101 videoflags |= SDL_FULLSCREEN;
102 } else {
103 fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
104 quit(1);
105 }
106 }
107
108 /* Set 640x480 video mode */
109 if ( SDL_SetVideoMode(640, 480, 0, videoflags) == NULL ) {
110 fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
111 SDL_GetError());
112 quit(2);
113 }
114
115 /* Enable UNICODE translation for keyboard input */
116 SDL_EnableUNICODE(1);
117
118 /* Enable auto repeat for keyboard input */
119 SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
120 SDL_DEFAULT_REPEAT_INTERVAL);
121
122 /* Watch keystrokes */
123 done = 0;
124 while ( !done ) {
125 /* Check for events */
126 SDL_WaitEvent(&event);
127 switch (event.type) {
128 case SDL_KEYDOWN:
129 PrintKey(&event.key.keysym, 1);
130 break;
131 case SDL_KEYUP:
132 PrintKey(&event.key.keysym, 0);
133 break;
134 case SDL_MOUSEBUTTONDOWN:
135 /* Any button press quits the app... */
136 case SDL_QUIT:
137 done = 1;
138 break;
139 default:
140 break;
141 }
142 }
143
144 SDL_Quit();
145 return(0);
146 }
147