DXmHelpSystemOpen man page on Ultrix

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DXmHelpSystemOpen(3X)					 DXmHelpSystemOpen(3X)

       DXmHelpSystemOpen  -  Completes	initialization	operations required by
       LinkWorks and prepares to display a topic from the specified help  file

       void  DXmHelpSystemOpen(help_context,  main_window, help_file, routine,
	     Opaque  *help_context;
	     Widget  main_window;
	     char    *help_file;
	     void    ((*routine )()),
	     Opaque  tag);

       Used by the DECwindows Motif Help System to pass required LinkWorks and
       help  information  from one routine to another.	Note that help_context
       must be defined globally; the DXmHelpSystemDisplay  and	DXmHelpSystem‐
       Close  routines	subsequently  use  the	address initially set for this
       parameter.  The identifier (ID) for the main window of the application.
       The file name of the help file.	The default specifications are as fol‐


	      Default		   Description


	      /usr/lib/X11/help/   Directory location

	      .decw_book	   File extension


	      You can also provide your own location or extension  along  with
	      the help file name.

	      Note that help_file is required for this routine but is optional
	      for DXmHelpSystemDisplay.	 Used for  error  processing.	If  an
	      error occurs within the DECwindows Motif Help System and it can‐
	      not be processed by either LinkWorks or Bookreader, the  DECwin‐
	      dows  Motif  Help	 System calls the error processing routine you
	      have included in your application and passes in an  integer,  or
	      status,  to  indicate  the status of the error processing opera‐
	      tion, as follows:


	      Value   Description


	      1	      The DECwindows Motif  Help
		      System  could not find the
		      LinkWorks shareable image.

	      2	      The DECwindows Motif  Help
		      System could not translate
		      a specified value	 into  a
		      valid file specification.


	      Note  the	 following:  The status parameter is a system-supplied
	      parameter that supplements the routine and  tag  parameters  you
	      have  already  specified in the application.  If an error cannot
	      be processed by either LinkWorks or Bookreader and you have  not
	      specified	 a  supplementary  error handling routine, your system
	      will generate an access violation error message.	The  parameter
	      you supply to the previously described routine parameter.	 Asso‐
	      ciating a tag with the routine enables you to more easily deter‐
	      mine where errors occur.

       This routine is not supported on all operating systems.

       Within  the DECwindows Motif Help System, the DXmHelpSystemOpen routine
       completes all of the initialization operations required	by  LinkWorks,
       such  as	 creating  a  DECwindows user interface object and a surrogate
       object, and then prepares to display a topic from the  help  file  name
       passed  in.   You  should make the call to this routine just before the
       main loop of your application.

       DXmHelpSystemClose(3X), DXmHelpSystemDisplay(3X)


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