Manual Pages for UNIX Operating System command usage for man XtScreenDatabase

XT FUNCTIONS                             XtDisplayInitialize(3xt)



NAME
     XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreen-
     Database, XtCloseDisplay - initialize, open, or close a
     display

SYNTAX
     cc [ flag... ] file... -lXt [ library... ]

     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 argu-
               ment is passed as a parameter to XrmParseCommand.
               For further information, see Xlib - C Language X



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XT FUNCTIONS                             XtDisplayInitialize(3xt)



               Interface.

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

DESCRIPTION
     The XtDisplayInitialize function builds the resource data-
     base, 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 syn-
     chronize 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 applica-
     tion 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; other-
     wise, they should call XtDestroyApplicationContext or just
     exit.

     The XtDatabase function returns the fully merged resource
     database that was built by XtDisplayInitialize associated



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XT FUNCTIONS                             XtDisplayInitialize(3xt)



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


ATTRIBUTES
     See attributes(5) for descriptions of the following attri-
     butes:

     __________________________________________________________________
    |       ATTRIBUTE TYPE        |          ATTRIBUTE VALUE          |
    |_____________________________|___________________________________|
    | Availability                | x11/library/toolkit/libxt         |
    |_____________________________|___________________________________|
    | Interface Stability         | Committed                         |
    |_____________________________|___________________________________|
    | MT-Level                    | See XtToolkitThreadInitialize(3XT)|
    |_____________________________|___________________________________|



























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