NAME

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

SYNTAX

       #include <X11/Intrinsic.h>

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

       Display    *XtOpenDisplay(XtAppContext    app_context,    const    char   *display_string,   const   char
              *application_name, const char *application_class, XrmOptionDescRec *options, Cardinal num_options,
              int *argc, char **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

X Version 11                                       libXt 1.2.1                            XtDisplayInitialize(3)