X Version 11 (1 September 1988) XrmGetResource(XS)
NAME
XrmGetResource, XrmQGetResource, XrmQGetSearchList,
XrmQGetSearchResource - retrieve database resources and
search lists
SYNTAX
Bool XrmGetResource(database, str_name, str_class,
str_type_return, value_return)
XrmDatabase database;
char *str_name;
char *str_class;
char **str_type_return;
XrmValue *value_return;
Bool XrmQGetResource(database, quark_name, quark_class,
quark_type_return, value_return)
XrmDatabase database;
XrmNameList quark_name;
XrmClassList quark_class;
XrmRepresentation *quark_type_return;
XrmValue *value_return;
typedef XrmHashTable *XrmSearchList;
Bool XrmQGetSearchList(database, names, classes,
list_return, list_length)
XrmDatabase database;
XrmNameList names;
XrmClassList classes;
XrmSearchList list_return;
int list_length;
Bool XrmQGetSearchResource(list, name, class, type_return,
value_return)
XrmSearchList list;
XrmName name;
XrmClass class;
XrmRepresentation *type_return;
XrmValue *value_return;
ARGUMENTS
class Specifies the resource class.
classes Specifies a list of resource classes.
database Specifies the database that is to be used.
list Specifies the search list returned by
XrmQGetSearchList.
list_length
Specifies the number of entries (not the byte
size) allocated for list_return.
list_return
Returns a search list for further use.
name Specifies the resource name.
names Specifies a list of resource names.
quark_class
Specifies the fully qualified class of the value
being retrieved (as a quark).
quark_name
Specifies the fully qualified name of the value
being retrieved (as a quark).
quark_type_return
Returns a pointer to the representation type of
the destination (as a quark).
str_class Specifies the fully qualified class of the value
being retrieved (as a string).
str_name Specifies the fully qualified name of the value
being retrieved (as a string).
str_type_return
Returns a pointer to the representation type of
the destination (as a string).
type_return
Returns data representation type.
value_return
Returns the value in the database.
DESCRIPTION
The XrmGetResource and XrmQGetResource functions retrieve a
resource from the specified database. Both take a fully
qualified name/class pair, a destination resource
representation, and the address of a value (size/address
pair). The value and returned type point into database
memory; therefore, you must not modify the data.
The database only frees or overwrites entries on
XrmPutResource, XrmQPutResource, or XrmMergeDatabases. A
client that is not storing new values into the database or
is not merging the database should be safe using the address
passed back at any time until it exits. If a resource was
found, both XrmGetResource and XrmQGetResource return True;
otherwise, they return False.
The XrmQGetSearchList function takes a list of names and
classes and returns a list of database levels where a match
might occur. The returned list is in best-to-worst order
and uses the same algorithm as XrmGetResource for
determining precedence. If list_return was large enough for
the search list, XrmQGetSearchList returns True; otherwise,
it returns False.
The size of the search list that the caller must allocate is
dependent upon the number of levels and wildcards in the
resource specifiers tha
nt are stored in the database. The
worst case length is 3 , where n is the number of name or
class components in names or classes.
When using XrmQGetSearchList followed by multiple probes for
resources with a common name and class prefix, only the
common prefix should be specified in the name and class list
to XrmQGetSearchList.
The XrmQGetSearchResource function searches the specified
database levels for the resource that is fully identified by
the specified name and class. The search stops with the
first match. XrmQGetSearchResource returns True if the
resource was found; otherwise, it returns False.
A call to XrmQGetSearchList with a name and class list
containing all but the last component of a resource name
followed by a call to XrmQGetSearchResource with the last
component name and class returns the same database entry as
XrmGetResource and XrmQGetResource with the fully qualified
name and class.
SEE ALSO
XrmInitialize(XS), XrmMergeDatabases(XS),
XrmPutResource(XS), XrmUniqueQuark(XS)
Xlib - C Language X Interface
(printed 2/12/90) (1 September 1988) XrmGetResource(XS)