This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
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. */
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static void
quit(int rc)
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SDL_Quit();
exit(rc);
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print_string(char **text, size_t *maxlen, const char *fmt, ...)
{
int len;
va_list ap;
va_start(ap, fmt);
len = SDL_vsnprintf(*text, *maxlen, fmt, ap);
if (len > 0) {
*text += len;
if (len < *maxlen) {
*maxlen -= len;
} else {
*maxlen = 0;
}
}
va_end(ap);
}
static void
print_modifiers(char **text, size_t *maxlen)
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print_string(text, maxlen, " modifiers:");
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mod = SDL_GetModState();
if (!mod) {
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print_string(text, maxlen, " (none)");
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return;
}
if (mod & KMOD_LSHIFT)
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print_string(text, maxlen, " LSHIFT");
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if (mod & KMOD_RSHIFT)
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print_string(text, maxlen, " RSHIFT");
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if (mod & KMOD_LCTRL)
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print_string(text, maxlen, " LCTRL");
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if (mod & KMOD_RCTRL)
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print_string(text, maxlen, " RCTRL");
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if (mod & KMOD_LALT)
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print_string(text, maxlen, " LALT");
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if (mod & KMOD_RALT)
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print_string(text, maxlen, " RALT");
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if (mod & KMOD_LGUI)
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print_string(text, maxlen, " LGUI");
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if (mod & KMOD_RGUI)
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print_string(text, maxlen, " RGUI");
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if (mod & KMOD_NUM)
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print_string(text, maxlen, " NUM");
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if (mod & KMOD_CAPS)
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print_string(text, maxlen, " CAPS");
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if (mod & KMOD_MODE)
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print_string(text, maxlen, " MODE");
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}
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PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
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char message[512];
char *spot;
size_t left;
spot = message;
left = sizeof(message);
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/* Print the keycode, name and state */
if (sym->sym) {
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print_string(&spot, &left,
"Key %s: scancode %d = %s, keycode 0x%08X = %s ",
pressed ? "pressed " : "released",
sym->scancode,
SDL_GetScancodeName(sym->scancode),
sym->sym, SDL_GetKeyName(sym->sym));
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print_string(&spot, &left,
"Unknown Key (scancode %d = %s) %s ",
sym->scancode,
SDL_GetScancodeName(sym->scancode),
pressed ? "pressed" : "released");
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/* Print the translated character, if one exists */
if (sym->unicode) {
/* Is it a control-character? */
if (sym->unicode < ' ') {
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print_string(&spot, &left, " (^%c)", sym->unicode + '@');
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#ifdef UNICODE
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print_string(&spot, &left, " (%c)", sym->unicode);
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#else
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/* This is a Latin-1 program, so only show 8-bits */
if (!(sym->unicode & 0xFF00))
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print_string(&spot, &left, " (%c)", sym->unicode);
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print_string(&spot, &left, " (0x%X)", sym->unicode);
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#endif
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print_modifiers(&spot, &left);
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if (repeat) {
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print_string(&spot, &left, " (repeat)");
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SDL_Log("%s", message);
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}
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static void
PrintText(char *text)
{
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SDL_Log("Text: %s", text);
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#if __IPHONEOS__
extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardShow(SDL_Window * window);
#endif
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int
main(int argc, char *argv[])
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{
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SDL_Window *window;
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SDL_Event event;
int done;
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/* Initialize SDL */
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
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/* Set 640x480 video mode */
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window = SDL_CreateWindow("CheckKeys Test",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
640, 480, 0);
if (!window) {
fprintf(stderr, "Couldn't create 640x480 window: %s\n",
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SDL_GetError());
quit(2);
}
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#if __IPHONEOS__
/* Creating the context creates the view, which we need to show keyboard */
SDL_GL_CreateContext(window);
SDL_iPhoneKeyboardShow(window);
#endif
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/* Watch keystrokes */
done = 0;
while (!done) {
/* Check for events */
SDL_WaitEvent(&event);
switch (event.type) {
case SDL_KEYDOWN:
case SDL_KEYUP:
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PrintKey(&event.key.keysym, event.key.state, event.key.repeat);
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case SDL_TEXTINPUT:
PrintText(event.text.text);
break;
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case SDL_MOUSEBUTTONDOWN:
/* Any button press quits the app... */
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
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SDL_Quit();
return (0);
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}
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/* vi: set ts=4 sw=4 expandtab: */