28.2.1 SECPlugProt

This class contains the core implementation of IInternetProtocol and IInternetProtocolInfo. It uses ATL COM to implement IUnknown and other required interfaces.

It contains an instance of and delegates all of its function calls to SECPlugProtImp.

28.2.2 SECPlugProtImp

You should derive a class from SECPlugProtImp to customize the default behavior and hook it into the SECPlugProt implementation.

28.2.3 FileDownloadInfo

This object, shared between the Worker Thread and the SECPlugProtImp object, allows access to information stored in its members regarding the data fetched so far, remaining data to be fetched and the actual fetched data, all in a thread-safe manner.

28.2.4 SECWorkerThreadFetchObject

The actual data fetch operation in a worker thread is performed within an instance of this interface. The interface for this class is designed to facilitate the worker thread's logic of fetching the data in blocks and transferring control intermittently to the main thread using Switch/Continue.

The wizard-inserted Worker Thread code should be completed by hooking in a custom instance of SECWorkerThreadFetchObject with the worker thread.

28.2.5 WorkerThreadMain

This class is the default worker thread control function. It initializes an instance of SECWorkerThreadFetchObject and instructs it to fetch data in blocks.

It also communicates with the main thread to transfer control intermittently (using Switch/Continue), to inform it regarding the thread completion, and to check if it should abort the operation before completion.