IStream also has these types of members: Methods The IStream interface inherits from the ISequentialStream interface. Managing Memory Allocation for details on COM's rules for managing memory. There will be a subsequent call to IBindStatusCallback::OnDataAvailable with the grfBSC flag set to BSCF_LASTDATANOTIFICATION.įor general information on this topic, seeĭata-Pull-Model versus Data Push-Model for more specific information. Read is called to read all the available data and the bind operation is over (end of file) Returns E_PENDING if the bind operation has not completed, and IBindStatusCallback::OnDataAvailable will be called again when more data is available. Read is called to read all the available data Even if the client returns from IBindStatusCallback::OnDataAvailable at this point the bind operation continues and IBindStatusCallback::OnDataAvailable will be called again repeatedly until the binding finishes. (that is, read until S_FALSE or E_PENDING is returned) The client must continue to read all available data before returning from IBindStatusCallback::OnDataAvailable or else the bind operation is blocked. Read is called to read partial data (that is, not all the available data)
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IStream::Seek calls returned in IBindStatusCallback::OnDataAvailable in these two download models: IStream method call The following table compares the behavior of asynchronous IMoniker::BindToStorage operation and for receiving asynchronous notifications.
Once released, the stream object is no longer valid and cannot be used.Ĭlients of asynchronous monikers can choose between a data-pull or data-push model for driving an asynchronous The IUnknown::Release method is similar to a close function on a file. Streams can remain open for long periods of time without consuming file-system resources. There are also methods for committing and reverting changes on streams that are open in transacted mode and methods for restricting access to a range of bytes in the stream. The methods in this interface present your object's data as a contiguous sequence of bytes that you can read or write. IStream interface pointer rather than a file handle. The main difference between a DOS file and a stream object is that in the latter case, streams are opened using an For example, each stream object has its own access rights and a seek pointer. IStream interface defines methods similar to the MS-DOS FAT file functions. Simple data can be written directly to a stream but, most frequently, streams are elements nested within a storage object.
Stream objects contain the data in a structured storage object, where storages provide the structure. IStream interface lets you read and write data to stream objects.
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