XLookupKeysym(3) XLIB FUNCTIONS XLookupKeysym(3)NAME
XLookupKeysym, XRefreshKeyboardMapping, XLookupString, XRebindKeysym -
handle keyboard input events in Latin-1
SYNTAX
KeySym XLookupKeysym(XKeyEvent *key_event, int index);
int XRefreshKeyboardMapping(XMappingEvent *event_map);
int XLookupString(XKeyEvent *event_struct, char *buffer_return, int
bytes_buffer, KeySym *keysym_return, XComposeStatus *sta‐
tus_in_out);
int XRebindKeysym(Display *display, KeySym keysym, KeySym list[], int
mod_count, unsigned char *string, int num_bytes);
ARGUMENTS
buffer_return
Returns the translated characters.
bytes_buffer
Specifies the length of the buffer. No more than bytes_buf‐
fer of translation are returned.
num_bytes Specifies the number of bytes in the string argument.
display Specifies the connection to the X server.
event_map Specifies the mapping event that is to be used.
event_struct
Specifies the key event structure to be used. You can pass
XKeyPressedEvent or XKeyReleasedEvent.
index Specifies the index into the KeySyms list for the event's
KeyCode.
key_event Specifies the KeyPress or KeyRelease event.
keysym Specifies the KeySym that is to be .
keysym_return
Returns the KeySym computed from the event if this argument
is not NULL.
list Specifies the KeySyms to be used as modifiers.
mod_count Specifies the number of modifiers in the modifier list.
status_in_out
Specifies or returns the XComposeStatus structure or NULL.
string Specifies the string that is copied and will be returned by
XLookupString.
DESCRIPTION
The XLookupKeysym function uses a given keyboard event and the index
you specified to return the KeySym from the list that corresponds to
the KeyCode member in the XKeyPressedEvent or XKeyReleasedEvent struc‐
ture. If no KeySym is defined for the KeyCode of the event, XLookup‐
Keysym returns NoSymbol.
The XRefreshKeyboardMapping function refreshes the stored modifier and
keymap information. You usually call this function when a MappingNo‐
tify event with a request member of MappingKeyboard or MappingModifier
occurs. The result is to update Xlib's knowledge of the keyboard.
The XLookupString function translates a key event to a KeySym and a
string. The KeySym is obtained by using the standard interpretation of
the Shift, Lock, group, and numlock modifiers as defined in the X Pro‐
tocol specification. If the KeySym has been rebound (see XRebind‐
Keysym), the bound string will be stored in the buffer. Otherwise, the
KeySym is mapped, if possible, to an ISO Latin-1 character or (if the
Control modifier is on) to an ASCII control character, and that charac‐
ter is stored in the buffer. XLookupString returns the number of char‐
acters that are stored in the buffer.
If present (non-NULL), the XComposeStatus structure records the state,
which is private to Xlib, that needs preservation across calls to
XLookupString to implement compose processing. The creation of XCom‐
poseStatus structures is implementation-dependent; a portable program
must pass NULL for this argument.
The XRebindKeysym function can be used to rebind the meaning of a
KeySym for the client. It does not redefine any key in the X server
but merely provides an easy way for long strings to be attached to
keys. XLookupString returns this string when the appropriate set of
modifier keys are pressed and when the KeySym would have been used for
the translation. No text conversions are performed; the client is
responsible for supplying appropriately encoded strings. Note that you
can rebind a KeySym that may not exist.
SEE ALSOXButtonEvent(3X11), XMapEvent(3X11), XStringToKeysym(3X11)
Xlib - C Language X Interface
X Version 11 libX11 1.2 XLookupKeysym(3)
