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sdl_keysym(3) [centos man page]

SDL_keysym(3)							 SDL API Reference						     SDL_keysym(3)

NAME
SDL_keysym - Keysym structure STRUCTURE DEFINITION
typedef struct{ Uint8 scancode; SDLKey sym; SDLMod mod; Uint16 unicode; } SDL_keysym; STRUCTURE DATA
scancode Hardware specific scancode sym SDL virtual keysym mod Current key modifiers unicode Translated character DESCRIPTION
The SDL_keysym structure is used by reporting key presses and releases since it is a part of the SDL_KeyboardEvent. The scancode field should generally be left alone, it is the hardware dependent scancode returned by the keyboard. The sym field is extremely useful. It is the SDL-defined value of the key (see SDL Key Syms. This field is very useful when you are checking for certain key presses, like so: . . while(SDL_PollEvent(&event)){ switch(event.type){ case SDL_KEYDOWN: if(event.key.keysym.sym==SDLK_LEFT) move_left(); break; . . . } } . . mod stores the current state of the keyboard modifiers as explained in SDL_GetModState. The unicode is only used when UNICODE translation is enabled with SDL_EnableUNICODE. If unicode is non-zero then this a the UNICODE character corresponding to the keypress. If the high 9 bits of the character are 0, then this maps to the equivalent ASCII character: char ch; if ( (keysym.unicode & 0xFF80) == 0 ) { ch = keysym.unicode & 0x7F; } else { printf("An International Character. "); } UNICODE translation does have a slight overhead so don't enable it unless its needed. SEE ALSO
SDLKey SDL
Tue 11 Sep 2001, 23:00 SDL_keysym(3)

Check Out this Related Man Page

keyboard_ucallback(3alleg4)                                       Allegro manual                                       keyboard_ucallback(3alleg4)

NAME
keyboard_ucallback - User specified unicode keyboard callback handler. Allegro game programming library. SYNOPSIS
#include <allegro.h> extern int (*keyboard_ucallback)(int key, int *scancode); DESCRIPTION
Unicode-aware version of keyboard_callback(). If set, this function is called by the keyboard handler in response to every keypress. It is passed the character value and scancode that are about to be added into the input buffer, can modify the scancode value, and returns a new or modified key code. If it both sets the scancode to zero and returns zero, the keypress will be ignored. This routine executes in an interrupt context, so it must be in locked memory. Example: int silence_g_key(int key, int *scancode) { if (key == 'g') { *scancode = 0; return 0; } return key; } END_OF_FUNCTION(silence_g_key) ... install_timer(); LOCK_FUNCTION(silence_g_key); install_keyboard(); keyboard_ucallback = silence_g_key; Note that this keyboard callback has priority over the non unicode callback. If you set both, only the unicode one will work. SEE ALSO
install_keyboard(3alleg4), readkey(3alleg4), ureadkey(3alleg4), keyboard_callback(3alleg4), keyboard_lowlevel_callback(3alleg4) Allegro version 4.4.2 keyboard_ucallback(3alleg4)

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