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XtDisplayInitialize(3Xt)	XT FUNCTIONS	     XtDisplayInitialize(3Xt)



NAME
  XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreenDatabase, XtClose-
  Display - initialize, open, or close a display

SYNTAX
  void XtDisplayInitialize(app_context, display, application_name,
  application_class,
			 options, num_options, argc, argv)
	XtAppContext app_context;
	Display *display;
	String application_name;
	String application_class;
	XrmOptionDescRec *options;
	Cardinal num_options;
	int *argc;
	String *argv;

  Display *XtOpenDisplay(app_context, display_string, application_name,
  application_class,
			 options, num_options, argc, argv)
	 XtAppContext app_context;
	 String display_string;
	 String application_name;
	 String application_class;
	 XrmOptionDescRec *options;
	 Cardinal num_options;
	 int *argc;
	 String *argv;

  void XtCloseDisplay(display)
	Display *display;

  XrmDatabase XtDatabase(display)
	Display *display;

  XrmDatabase XtScreenDatabase(screen)
	Screen* screen;

ARGUMENTS

  argc	    Specifies a pointer to the number of command line parameters.

  argv	    Specifies the command line parameters.

  app_context
	    Specifies the application context.

  application_class
	    Specifies the class name of this application, which usually is
	    the generic name for all instances of this application.

  application_name
	    Specifies the name of the application instance.

  display   Specifies the display.  Note that a display can be in at most one
	    application context.

  num_options
	    Specifies the number of entries in the options list.

  options   Specifies how to parse the command line for any application-
	    specific resources.	 The options argument is passed as a parame-
	    ter to XrmParseCommand.  For further information, see Xlib - C
	    Language X Interface.

  screen    Specifies the screen whose resource database is to be returned.

DESCRIPTION
  The XtDisplayInitialize function builds the resource database, calls the
  Xlib XrmParseCommand function to parse the command line, and performs other
  per display initialization.  After XrmParseCommand has been called, argc
  and argv contain only those parameters that were not in the standard option
  table or in the table specified by the options argument.  If the modified
  argc is not zero, most applications simply print out the modified argv
  along with a message listing the allowable options.  On UNIX-based systems,
  the application name is usually the final component of argv[0].  If the
  synchronize resource is True for the specified application, XtDisplay-
  Initialize calls the Xlib XSynchronize function to put Xlib into synchro-
  nous mode for this display connection.  If the reverseVideo resource is
  True, the Intrinsics exchange XtDefaultForeground and XtDefaultBackground
  for widgets created on this display.	(See Section 9.6.1).

  The XtOpenDisplay function calls XOpenDisplay the specified display name.
  If display_string is NULL, XtOpenDisplay uses the current value of the
  -display option specified in argv and if no display is specified in argv,
  uses the user's default display (on UNIX-based systems, this is the value
  of the DISPLAY environment variable).

  If this succeeds, it then calls XtDisplayInitialize and pass it the opened
  display and the value of the -name option specified in argv as the applica-
  tion name.  If no name option is specified, it uses the application name
  passed to XtOpenDisplay.  If the application name is NULL, it uses the last
  component of argv[0].	 XtOpenDisplay returns the newly opened display or
  NULL if it failed.

  XtOpenDisplay is provided as a convenience to the application programmer.

  The XtCloseDisplay function closes the specified display as soon as it is
  safe to do so.  If called from within an event dispatch (for example, a
  callback procedure), XtCloseDisplay does not close the display until the
  dispatch is complete.	 Note that applications need only call XtCloseDisplay
  if they are to continue executing after closing the display; otherwise,
  they should call XtDestroyApplicationContext or just exit.

  The XtDatabase function returns the fully merged resource database that was
  built by XtDisplayInitialize associated with the display that was passed
  in.  If this display has not been initialized by XtDisplayInitialize, the
  results are not defined.

  The XtScreenDatabase function returns the fully merged resource database
  associated with the specified screen. If the screen does not belong to a
  Display initilized by XtDisplayInitialize, the results are undefined.

SEE ALSO
  XtAppCreateShell(3Xt), XtCreateApplicationContext(3Xt)
  X Toolkit Intrinsics - C Language Interface
  Xlib - C Language X Interface








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