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

NAME

       XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreenDatabase, XtCloseDisplay - 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 parameter 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 per-
       forms 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, XtDisplayInitialize calls the Xlib XSyn-
       chronize function to put Xlib into synchronous 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 application 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

X Version 11							    Release 6.6 					  XtDisplayInitialize(3Xt)