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CentOS 7.0 - man page for xtdatabase (centos section 3)

XtDisplayInitialize(3)			   XT FUNCTIONS 		   XtDisplayInitialize(3)

NAME
       XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreenDatabase, XtCloseDisplay - ini-
       tialize, open, or close a display

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

       Display *XtOpenDisplay(XtAppContext app_context, String display_string, String applica-
	      tion_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 XrmParseCom-
       mand 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 applica-
       tion 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 dis-
       play_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), XtClose-
       Display 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 XtDisplay-
       Initialize, the results are undefined.

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

X Version 11				   libXt 1.1.4			   XtDisplayInitialize(3)


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