NAME

       XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreenDatabase, XtCloseDisplay - initialize, open, or
       close a display

SYNTAX

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

       Display *XtOpenDisplay(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);

       XrmDatabase XtDatabase(Display *display);

       XrmDatabase XtScreenDatabase(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 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, XtDisplayInitialize calls the Xlib XSynchronize 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 initialized by XtDisplayInitialize, the results are
       undefined.

SEE ALSO

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