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BoxedApp SDK Help >> Virtual File System
IStream-based Virtual File
BoxedAppSDK_CreateVirtualFile creates a file with the contents located in the shared memory. This is the easiest way to create a virtual file, which is sufficient for the majority of cases. However, sometimes you may need to have a virtual file with its data stored in other places: database, encrypted file or the Internet. For that purpose, BoxedApp SDK allows creating a virtual file, based on the implementation of the standard interface IStream: BoxedAppSDK_CreateVirtualFileBasedOnIStream.
Reading from such file takes the method IStream::Read(); writing to it calls IStream::Write(). Creating a new handler that points to such file requires IStream::Clone(), which returns IStream with its own current pointer. To set and get the current position in that file, BoxedApp uses IStream::Seek(). To resize the file, it uses IStream::SetSize(). To get the size of the file, it can call the method IStream::Stat():