Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Xlib: XKeysymToKeycode hangs
Top Forums UNIX for Advanced & Expert Users Xlib: XKeysymToKeycode hangs Post 302748663 by N7DR on Wednesday 26th of December 2012 01:47:18 PM
Old 12-26-2012
Quote:
Ok - this is C, you assert the _display_p variable is valid. You know this how?

Please post your code.
The pertinent class is called keyboard_queue.

In the class definition, there is:

Code:
  Display*                    _display_p;   // the X display pointer

The constructor provides a value for this in the initializer list:

Code:
  _display_p(XOpenDisplay(NULL)),

The value is tested inside the construstor, just in case the call to XOpenDisplay() failed:

Code:
 if (!_display_p)
  { cerr << "Fatal error: unable to open display" << endl;
    exit (-1);
  }

Then, inside a member function called push_key_press, occurs the line that hangs (I have temporarily, while testing, replaced the call to the variable ks of type KeySym with an explicit value, XK_g):

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

Following the initialisation of _display_p in the class constructor, the only place that _display_p is used is in direct calls to X functions: I never access it myself.

If I remove the line that hangs, and code that depends on it, then everything else -- in particular, all the calls to X functions, both prior to and subsequent to the offending line -- works as expected.
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

xlib error

Hello! Im running tight VNC on Red Hat Enterprise Linux 4.0. How can I increase the number of X clients that I can run in a VNC session?I need to run aproximately 500 programs in one VNC session, but at this time I can only 236 -> i've tryed to launch 250 xclock's in background and when it... (3 Replies)
Discussion started by: karpoand
3 Replies

2. UNIX and Linux Applications

vncserver xlib error

Hello! Im running tight VNC on Red Hat Enterprise Linux 4.0. How can I increase the number of X clients that I can run in a VNC session?I need to run aproximately 500 programs in one VNC session, but at this time I can only 236 -> i've tryed to launch 250 xclock's in background and when it... (0 Replies)
Discussion started by: karpoand
0 Replies

3. Programming

Xlib simple program.

I don't know if it is right to ask you this. Can someone help me write a simple Xlib program,with button on it,and all that button do is switch 2 messages. I have tried and tried,but never get past Hello World. Can someone help me please? ---------- Post updated at 10:17 PM ---------- Previous... (2 Replies)
Discussion started by: megane16v
2 Replies

4. UNIX for Dummies Questions & Answers

Xlib Errors

Hi, I am handling user issues in my team. Users have their Unix session running on Citrix MFU. Recently, I was suppose to address a user issue which is as below: Gets the below error when tries to open nedit: Xlib: connection to ":165.0" refused by server Xlib: Client is not... (1 Reply)
Discussion started by: mspatil0037
1 Replies

5. UNIX for Advanced & Expert Users

xlib and keyboard events

1. If there's some better place where xlib experts hang out, please tell me. Despite an assiduous search, I could not find an xlib reflector. 2. My actual question: In an xterm, I want to grab and process all keyboard events in a program running inside the xterm. For example, with my program... (5 Replies)
Discussion started by: N7DR
5 Replies

6. Homework & Coursework Questions

Xlib help - Array of Structs

Hey guys! First of all english is not my main language so sorry for any english mistakes. Im from Portugal! 1. The problem statement, all variables and given/known data: Im having a problema creating and array of structs for a work i need to do. (xLib) 2. Relevant commands, code,... (1 Reply)
Discussion started by: Spiritvs
1 Replies

7. Programming

Xlib registering

hey, Im new to the linux world. Lately, I have tried to create a glx window with xlib, making it a popup window(fullscreen) so I set override_redirect to true. Im happy with the removed borders, but apparantly, the application doesnt show up in the left bar in ubuntu, neither when I press alt... (4 Replies)
Discussion started by: thedardanius
4 Replies

8. Programming

[xlib] Image has just 1/4 size

Hello, i'm trying to show the Image of an monochrome webcam in an xlib-Window. initializing of the window: if (NULL == ((*XWindow)->display = XOpenDisplay(NULL))) APPLICATION_Set_Error(V4LCamera->Application, XWINDOW, "failed to open display", 123, -1, APPLICATION_ERROR_MESSAGE); ... (1 Reply)
Discussion started by: mirrowwinger
1 Replies

9. Programming

Xlib search window by his name

Hello, I just try to get the control of a Window by searching his name. I curretly do that : Window CMD::window_from_name_search(Display *display, Window current, char const *needle) { Window retval, root, parent, *children; unsigned children_count; char *name = NULL; ... (0 Replies)
Discussion started by: Loustak
0 Replies

10. Programming

Linux (Xlib) Application hangs on GetGeometry()

Hello, I was just wondering why XGetGeometry() would cause a hang in an application. In the xlib book it says any of there "Get" functions don't necessarily return immediately. Is there a way to make a it return immediately or other functions that will give me the same results. I... (1 Reply)
Discussion started by: TMurray77
1 Replies

LEARN ABOUT CENTOS

locale::codes::langfam

Locale::Codes::LangFam(3)				User Contributed Perl Documentation				 Locale::Codes::LangFam(3)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a
       constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-02-27						 Locale::Codes::LangFam(3)
All times are GMT -4. The time now is 06:14 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy