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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"
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
SDL_Quit();
exit(rc);
}
static void print_modifiers(void)
{
int mod;
printf(" -");
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_LGUI)
printf(" LGUI");
if(mod & KMOD_RGUI)
printf(" RGUI");
if(mod & KMOD_NUM)
printf(" NUMLOCK");
if(mod & KMOD_CAPS)
printf(" CAPS");
if(mod & KMOD_MODE)
printf(" MODE");
}
static void PrintKey(SDL_Keysym *sym, int pressed)
{
/* Print the keycode, scancode, their names names and state */
if ( sym->sym ) {
printf("Key %s: 0x%2x/0x%2x (%d/%d) - %s - %s",
pressed ? "pressed " : "released",
sym->sym, sym->scancode,
sym->sym, sym->scancode,
SDL_GetKeyName(sym->sym),
SDL_GetScancodeName(sym->scancode));
} else {
printf("Unknown Key, scancode = 0x%2x (%d) - %s",
sym->scancode, sym->scancode,
pressed ? "pressed" : "released");
}
print_modifiers();
printf("\n");
}
int main(int argc, char *argv[])
{
SDL_Window *window;
Uint32 videoflags = 0;
SDL_Event event;
int wd = 640;
int ht = 480;
int done;
/* Initialize SDL */
if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
return(1);
}
while( argc > 1 ) {
--argc;
if ( argv[argc] && !strcmp(argv[argc], "-fullscreen") ) {
videoflags = SDL_WINDOW_FULLSCREEN;
} else {
fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
quit(1);
}
}
if (videoflags & SDL_WINDOW_FULLSCREEN) {
SDL_DisplayMode dm;
videoflags |= SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_BORDERLESS | SDL_WINDOW_INPUT_GRABBED;
if (SDL_GetDesktopDisplayMode(0, &dm)) {
fprintf(stderr, "SDL_GetDesktopDisplayMode failed: %s", SDL_GetError());
quit(1);
}
wd = dm.w;
ht = dm.h;
} else {
videoflags = SDL_WINDOW_RESIZABLE;
}
window = SDL_CreateWindow("CheckKeys",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
wd, ht, videoflags);
if (!window) {
fprintf(stderr, "Failed to create %dx%d window: %s\n",
wd, ht, SDL_GetError());
quit(2);
}
puts("Click to the window to quit.\n");
/* Watch keystrokes */
done = 0;
puts("Status: hex sym/scan (dec) - sym - scan - modifiers\n");
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;
}
}
SDL_Quit();
return 0;
}
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