XtDatabase() XtDatabase()
Name
XtDatabase - obtain the resource database for a display.
Synopsis
XrmDatabase XtDatabase(display)
Display *display;
Inputs
display Specifies the display for which the resource database should be returned.
Returns
The database for the specified display, or NULL.
Description
In Release 4 and previous releases, XtDatabase() returns the resource database built by XtDisplayInitialize() for the display. In Release
5, which supports a resource database for each screen, XtDatabase() returns the resource database built by XtDisplayInitialize() for the
default screen of the display.
In Release 4 and previous releases, the results are undefined if display has not been initialized by XtDisplayInitialize(). In Release 5,
XtDatabase() returns NULL if no database has been set for the display.
Usage
In Release 5, the function XtScreenDatabase() returns the resource associated with a specified screen.
You should rarely need to obtain the database of a display or screen. XtGetApplicationResources() and related functions provide a more
manageable approach to obtaining resource values.
Structures
XrmDatabase is an opaque data type.
See AlsoXtAppInitialize(1), XtDisplayInitialize(1), XtScreenDatabase(1).
Xt - Resource Management XtDatabase()
Check Out this Related Man Page
XtDisplayInitialize(3Xt) XT FUNCTIONS XtDisplayInitialize(3Xt)NAME
XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreenDatabase, XtCloseDisplay - initialize, open, or close a display
SYNTAX
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;
int *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;
int *argc;
String *argv;
void XtCloseDisplay(display)
Display *display;
XrmDatabase XtDatabase(display)
Display *display;
XrmDatabase XtScreenDatabase(screen)
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 per-
forms 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 XSyn-
chronize 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 initilized by XtDisplayInitialize, the results are undefined.
SEE ALSO XtAppCreateShell(3Xt), XtCreateApplicationContext(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
X Version 11 Release 6.6 XtDisplayInitialize(3Xt)