The TOOLBARHANDLE structure serves as a working area for the toolbar functions. The user can initialize the toolbar handle at the start of a program and save it in a variable. The toolbar handle can then be used with any LEAD toolbar function. When the toolbar handle is no longer needed, the user can free it. Therefore, the user does not have to initialize the toolbar handle and free it every time it is used.
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms