nsIClassInfo

Provides information about a specific implementation class. If you want
your class to implement nsIClassInfo, see nsIClassInfoImpl.h for
instructions–you most likely do not want to inherit from nsIClassInfo.

Methods

getInterfaces(count, array)

Get an ordered list of the interface ids that instances of the class
promise to implement. Note that nsISupports is an implicit member
of any such list and need not be included.

Should set *count = 0 and *array = null and return NS_OK if getting the
list is not supported.

getHelperForLanguage(language)

Get a language mapping specific helper object that may assist in using
objects of this class in a specific lanaguage. For instance, if asked
for the helper for nsIProgrammingLanguage::JAVASCRIPT this might return
an object that can be QI’d into the nsIXPCScriptable interface to assist
XPConnect in supplying JavaScript specific behavior to callers of the
instance object.

see: nsIProgrammingLanguage.idl

Should return null if no helper available for given language.

Attributes

contractID

A contract ID through which an instance of this class can be created
(or accessed as a service, if |flags & SINGLETON|), or null.

classDescription

A human readable string naming the class, or null.

classID

A class ID through which an instance of this class can be created
(or accessed as a service, if |flags & SINGLETON|), or null.

implementationLanguage

Return language type from list in nsIProgrammingLanguage

flags

classIDNoAlloc

Also a class ID through which an instance of this class can be created
(or accessed as a service, if |flags & SINGLETON|). If the class does
not have a CID, it should return NS_ERROR_NOT_AVAILABLE. This attribute
exists so C++ callers can avoid allocating and freeing a CID, as would
happen if they used classID.

Constants

SINGLETON

Bitflags for ‘flags’ attribute.

THREADSAFE

MAIN_THREAD_ONLY

DOM_OBJECT

PLUGIN_OBJECT

SINGLETON_CLASSINFO

CONTENT_NODE

‘flags’ attribute bitflag: whether objects of this type implement
nsIContent.