test/checkkeys.c

   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. */
  14 static void quit(int rc)
  15 {
  16         SDL_Quit();
  17         exit(rc);
  18 }
  19
  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
  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
  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 }