checkkeys.c
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/* Simple program: Loop, watching keystrokes
Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to
pump the event loop and catch keystrokes.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
SDL_Quit();
exit(rc);
}
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static void print_modifiers(void)
{
int mod;
printf(" modifiers:");
mod = SDL_GetModState();
if(!mod) {
printf(" (none)");
return;
}
if(mod & KMOD_LSHIFT)
printf(" LSHIFT");
if(mod & KMOD_RSHIFT)
printf(" RSHIFT");
if(mod & KMOD_LCTRL)
printf(" LCTRL");
if(mod & KMOD_RCTRL)
printf(" RCTRL");
if(mod & KMOD_LALT)
printf(" LALT");
if(mod & KMOD_RALT)
printf(" RALT");
if(mod & KMOD_LMETA)
printf(" LMETA");
if(mod & KMOD_RMETA)
printf(" RMETA");
if(mod & KMOD_NUM)
printf(" NUM");
if(mod & KMOD_CAPS)
printf(" CAPS");
if(mod & KMOD_MODE)
printf(" MODE");
}
static void PrintKey(SDL_keysym *sym, int pressed)
{
/* Print the keycode, name and state */
if ( sym->sym ) {
printf("Key %s: %d-%s ", pressed ? "pressed" : "released",
sym->sym, SDL_GetKeyName(sym->sym));
} else {
printf("Unknown Key (scancode = %d) %s ", sym->scancode,
pressed ? "pressed" : "released");
}
/* Print the translated character, if one exists */
if ( sym->unicode ) {
/* Is it a control-character? */
if ( sym->unicode < ' ' ) {
printf(" (^%c)", sym->unicode+'@');
} else {
#ifdef UNICODE
printf(" (%c)", sym->unicode);
#else
/* This is a Latin-1 program, so only show 8-bits */
if ( !(sym->unicode & 0xFF00) )
printf(" (%c)", sym->unicode);
#endif
}
}
print_modifiers();
printf("\n");
}
int main(int argc, char *argv[])
{
SDL_Event event;
int done;
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Uint32 videoflags;
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/* Initialize SDL */
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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}
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videoflags = SDL_SWSURFACE;
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while( argc > 1 ) {
--argc;
if ( argv[argc] && !strcmp(argv[argc], "-fullscreen") ) {
videoflags |= SDL_FULLSCREEN;
} else {
fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
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}
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/* Set 640x480 video mode */
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if ( SDL_SetVideoMode(640, 480, 0, videoflags) == NULL ) {
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fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
SDL_GetError());
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}
/* Enable UNICODE translation for keyboard input */
SDL_EnableUNICODE(1);
/* Enable auto repeat for keyboard input */
SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
SDL_DEFAULT_REPEAT_INTERVAL);
/* Watch keystrokes */
done = 0;
while ( !done ) {
/* Check for events */
SDL_WaitEvent(&event);
switch (event.type) {
case SDL_KEYDOWN:
PrintKey(&event.key.keysym, 1);
break;
case SDL_KEYUP:
PrintKey(&event.key.keysym, 0);
break;
case SDL_MOUSEBUTTONDOWN:
/* Any button press quits the app... */
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
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SDL_Quit();
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return(0);
}