Version 15 of this C APIhas changed from version 14.5 as follows:
LEADTOOLS Version 15 now supports both ANSI and UNICODE development in the same libraries.
LEADTOOLS now supports development for x64 platforms.
LEADTOOLS now supports specifying the version of toolkit that you are using. You should define LTVXX_CONFIG in your project, where "*" is the version you are using, for example: LTV15_CONFIG.
The following topics have been added or updated:
Receiving Toolbar Events (Using Callback and Display)
For more information, refer to:
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms