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Full Discussion: Xlib: XKeysymToKeycode hangs
Top Forums UNIX for Advanced & Expert Users Xlib: XKeysymToKeycode hangs Post 302748199 by N7DR on Monday 24th of December 2012 04:43:13 PM
Old 12-24-2012
Xlib: XKeysymToKeycode hangs

Two simple questions related to the following puzzling behaviour:

I have the following line of code:

Code:
   const KeyCode kc = XKeysymToKeycode(_display_p, ks);

where _display_p is a valid Display* returned from XOpenDisplay() and ks has the value 103 (which was returned by XStringToKeysym(), and corresponds to 'g').

The above line of code hangs indefinitely; I have to kill the job manually.

Question #1: why is this happening? I can't see anything in any documentation that suggests that XKeysymToKeycode() can ever fail to return.

Question #2: how do I stop the call from hanging?
 

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XStringToKeysym(3)						  XLIB FUNCTIONS						XStringToKeysym(3)

NAME
XStringToKeysym, XKeysymToString, XKeycodeToKeysym, XKeysymToKeycode, XConvertCase - convert keysyms SYNTAX
KeySym XStringToKeysym(char *string); char *XKeysymToString(KeySym keysym); KeySym XKeycodeToKeysym(Display *display, KeyCode keycode, int index); KeyCode XKeysymToKeycode(Display *display, KeySym keysym); void XConvertCase(KeySym keysym, KeySym *lower_return, KeySym *upper_return); ARGUMENTS
display Specifies the connection to the X server. index Specifies the element of KeyCode vector. keycode Specifies the KeyCode. keysym Specifies the KeySym that is to be searched for or converted. lower_return Returns the lowercase form of keysym, or keysym. string Specifies the name of the KeySym that is to be converted. upper_return Returns the uppercase form of keysym, or keysym. DESCRIPTION
Standard KeySym names are obtained from <X11/keysymdef.h> by removing the XK_ prefix from each name. KeySyms that are not part of the Xlib standard also may be obtained with this function. The set of KeySyms that are available in this manner and the mechanisms by which Xlib obtains them is implementation-dependent. If the KeySym name is not in the Host Portable Character Encoding, the result is implementation-dependent. If the specified string does not match a valid KeySym, XStringToKeysym returns NoSymbol. The returned string is in a static area and must not be modified. The returned string is in the Host Portable Character Encoding. If the specified KeySym is not defined, XKeysymToString returns a NULL. The XKeycodeToKeysym function uses internal Xlib tables and returns the KeySym defined for the specified KeyCode and the element of the KeyCode vector. If no symbol is defined, XKeycodeToKeysym returns NoSymbol. If the specified KeySym is not defined for any KeyCode, XKeysymToKeycode returns zero. The XConvertCase function returns the uppercase and lowercase forms of the specified Keysym, if the KeySym is subject to case conversion; otherwise, the specified KeySym is returned to both lower_return and upper_return. Support for conversion of other than Latin and Cyrillic KeySyms is implementation-dependent. SEE ALSO
XLookupKeysym(3X11) Xlib - C Language X Interface X Version 11 libX11 1.2.1 XStringToKeysym(3)
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