XtGetClassExtension - locate a class extension record
XtGetClassExtension(object_class, byte_offset type, version, record_size)
Specifies the widget class containing the extension list to
Specifies the offset in bytes form the base of the widget
class of the extension field to be searched.
Specifies the name of the class extension to be located.
Specifies the minimum acceptable version of the class extension
required for a match.
Specifies the minimum acceptable length of the class extension
record required for match, or 0.
The list of extension records at the specified offset in the specified
will be searched for a match on the specified
type, a version greater than or equal to the specified
version, and a record size greater than or equal the specified
if it is nonzero.
returns a pointer to a matching extension record or NULL if no match is found.
The returned extension record is owned by the widget class and must not be
modified or freed by the caller, except possibly to be modified by the widget
X Toolkit Intrinsics -- C Language Interface
Xlib -- C Language X Interface