I seem to be getting really weird keysym values when shift is involved.
Sometimes a single keypress returns three keysyms in a row!
I’ve included an example program at the bottom of this post. I’m using a UK keyboard on ArchLinux.
Interestingly, I’ve actually had similar problems with GLFW but haven’t investigated as thoroughly.
SDL compile-time version 1.2.14
SDL runtime version 1.2.14
Here’s an example of the good output:
// Good Output: (Press “a” “b” “c” “,” “.” keys in that order:
Pressed: 97 “a” (SDL_GetKeyName: "a"
Pressed: 98 “b” (SDL_GetKeyName: "b"
Pressed: 99 “c” (SDL_GetKeyName: "c"
Pressed: 44 “,” (SDL_GetKeyName: ","
Pressed: 46 “.” (SDL_GetKeyName: “.”
And here’s all the cases of bad input I found.
// Bad Output: Press "["
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 56 “8” (SDL_GetKeyName: “8”
// Bad Output: Press "]"
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 57 “9” (SDL_GetKeyName: “9”
// Try Shift + “]”, in this case we get the expected result
Pressed: 304 “0” (SDL_GetKeyName: "left shift"
Pressed: 93 “]” (SDL_GetKeyName: “]”
// Bad Output; Press Shift + “,” (note comma without shift is fine)
// on a UK keyboard it corresponds to “<”)
Pressed: 304 “0” (SDL_GetKeyName: "left shift"
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 122 “z” (SDL_GetKeyName: “z”
// Bad Output; Press Shift + “.” (note period without shift is fine)
// (on a UK keyboard it corresponds to “>”)
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 120 “x” (SDL_GetKeyName: “x”
// Bad Output: Press Shift + Apostrophe
// (on a UK keyboard this corresponds to “@”
// Three keysyms generated!
Pressed: 304 “0” (SDL_GetKeyName: "left shift"
Pressed: 301 “-” (SDL_GetKeyName: "caps lock"
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 113 “q” (SDL_GetKeyName: “q”
// Press backslash
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 45 “-” (SDL_GetKeyName: “-”
// Press Shift + Backslash (this is the “|” stave):
Pressed: 304 “0” (SDL_GetKeyName: "left shift"
Pressed: 313 “9” (SDL_GetKeyName: "alt gr"
Pressed: 96 “" (SDL_GetKeyName: "”
// Actually pressing Alt Gr on the keyboard gives
Pressed: 306 “2” (SDL_GetKeyName: "left ctrl"
Pressed: 307 “3” (SDL_GetKeyName: “right alt”
Am I doing something wrong?
Working example:
Code:
#include <stdio.h>
#include “SDL.h”
void print_SDL_version(char* preamble, SDL_version* v)
{
printf("%s %u.%u.%u\n", preamble, v->major, v->minor, v->patch);
}
void print_SDL_versions(void)
{
SDL_version ver;
/* compiletimetime version */
SDL_VERSION(&ver);
print_SDL_version("SDL compile-time version", &ver);
/* run-time version */
ver = *SDL_Linked_Version();
print_SDL_version("SDL runtime version", &ver);
}
int main(void)
{
SDL_Surface *screen;
SDL_Event keyevent;
SDL_Init(SDL_INIT_VIDEO);
screen = SDL_SetVideoMode(320, 240, 32, SDL_SWSURFACE);
print_SDL_versions();
printf("SDL_EnableUNICODE = %d\n", SDL_EnableUNICODE(-1));
while (1)
{
while (SDL_PollEvent(&keyevent))
{
if (keyevent.key.keysym.sym == SDLK_ESCAPE) { return 0; }
if (keyevent.type == SDL_KEYDOWN)
{
printf("Pressed: %d \"%c\" "
"(SDL_GetKeyName: \"%s\"\n",
keyevent.key.keysym.sym,
keyevent.key.keysym.sym,
SDL_GetKeyName(keyevent.key.keysym.sym));
}
}
}
return 0;
}