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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.
 

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LEARN ABOUT DEBIAN

graphics::primitive::insets

Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME

       Graphics::Primitive::Insets - Space between things

DESCRIPTION

       Graphics::Primitive::Insets represents the amount of space that surrounds something.  This object can be used to represent either padding
       or margins (in the CSS sense, one being inside the bounding box, the other being outside)

SYNOPSIS

	 use Graphics::Primitive::Insets;

	 my $insets = Graphics::Primitive::Insets->new({
	   top	   => 5,
	   bottom  => 5,
	   left    => 5,
	   right   => 5
	 });

METHODS

   Constructor
       new Creates a new Graphics::Primitive::Insets.

   Instance Methods
       as_array
	   Return these insets as an array in the form of top, right, bottom and left.

       bottom
	   Set/Get the inset from the bottom.

       equal_to
	   Determine if these Insets are equal to another.

       left
	   Set/Get the inset from the left.

       right
	   Set/Get the inset from the right.

       top Set/Get the inset from the top.

       zero
	   Sets all the insets (top, left, bottom, right) to 0.

AUTHOR

       Cory Watson, "<gphat@cpan.org>"

SEE ALSO

       perl(1)

COPYRIGHT &; LICENSE
       Copyright 2008-2010 by Cory G Watson.

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

perl v5.12.3							    2010-08-21					  Graphics::Primitive::Insets(3pm)
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