The import filter API is a set of functions and data structures the Import Wizard uses to collect data from any given source system. An import filter must implement the full set of functions in a 32-bit DLL. When the Import Wizard calls an API function, it passes the address of one or more data structures to the function, and the function populates (fills in) the structures with the appropriate data.
This section provides an overview of the function calling sequence and describes how to solve problems that you may encounter. It does not cover every aspect of implementing an import filter. For complete implementation instructions, refer to the sample import filter. For detailed descriptions of all of the functions, structures, and enumerations that make up the SBCM API, see the SBCM API and Data Structure Reference.