XtDisplayInitialize(3Xt)

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

SYNTAX
void XtToolkitInitialize()

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;
      Cardinal *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;
       Cardinal *argc;
       String *argv;

void XtCloseDisplay(display)
      Display *display;

XrmDatabase XtDatabase(display)
      Display *display;

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 For further information, see Xlib - C Language X Interface.

DESCRIPTION
The function builds the resource database, calls the Xlib function to parse the command line, and performs other per display initialization. After 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 for the specified application, calls the Xlib function to put Xlib into synchronous mode for this display connection. If the reverseVideo resource is the Intrinsics exchange and for widgets created on this display. (See Section 9.6.1).

The function calls the specified display name. If display_string is NULL, 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 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 If the application name is NULL, it uses the last component of argv[0]. returns the newly opened display or NULL if it failed.

is provided as a convenience to the application programmer.

The 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), does not close the display until the dispatch is complete. Note that applications need only call if they are to continue executing after closing the display; otherwise, they should call or just exit.

The function returns the fully merged resource database that was built by associated with the display that was passed in. If this display has not been initialized by the results are not defined.

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