ITypeLib : IUnknown

This interface provides methods for accessing a library of type descriptions.

At a Glance

Header file:	Oaidl.h
Windows CE versions:	2.0 and later

The data that describes a set of objects is stored in a type library. A type library can be a stand-alone binary file (.tlb), a resource in a dynamic link library or executable file (.dll or .exe), or part of a compound document file.

Implemented by	Used by	Header file name
Oleaut32.dll (32-bit systems) Typelib.dll (16-bit systems)	Tools that need to access the descriptions of objects contained in type libraries.	Oleauto.h Dispatch.h

The system registry contains a list of all the installed type libraries.

The ITypeLib interface provides methods for accessing a library of type descriptions. This interface supports the following:

Generalized containment for type information. ITypeLib allows iteration over the type descriptions contained in the library.
Global functions and data. A type library can contain descriptions of a set of modules, each of which is the equivalent of a C or C++ source file that exports data and functions. The type library supports compiling references to the exported data and functions.
General information, including a user-readable name for the library and help for the library as a whole.

Method	Description
ITypeLib::FindName	Finds occurrences of a type description in a type library. This may be used to verify that a name exists in a type library.
ITypeLib::GetDocumentation	Retrieves the library’s documentation string, the complete Help file name and path, and the context identifier for the library Help topic.
ITypeLib::GetLibAttr	Retrieves the structure that contains the library’s attributes.
ITypeLib::GetTypeComp	Retrieves a pointer to the ITypeComp for a type library. This enables a client compiler to bind to the library’s types, variables, constants, and global functions.
ITypeLib::GetTypeInfo	Retrieves the specified type description in the library.
ITypeLib::GetTypeInfoCount	Retrieves the number of type descriptions in the library.
ITypeLib::GetTypeInfoOfGuid	Retrieves the type description that corresponds to the specified globally unique identifier (GUID).
ITypeLib::GetTypeInfoType	Retrieves the type of a type description.
ITypeLib::IsName	Indicates whether a passed-in string contains the name of a type or a member described in the library.
ITypeLib::ReleaseTLibAttr	Releases the TLIBATTR originally obtained from ITypeLib::GetLibAttr.