ISequentialStream:IUnknown (Windows CE 5.0)
This interface supports simplified sequential access to stream objects. The IStream interface inherits its Read and Write methods from ISequentialStream.
When to Implement
You can implement ISequentialStream on an object if you require simple sequential access to a stream object. If you implement IStream, you must provide an implementation of the Read and Write methods from ISequentialStream.
Note Most applications do not implement ISequentialStream as a separate interface, and you are not required to provide it separately even if you provide an IStream implementation.
For example, the compound file implementation of structured storage does not succeed on a QueryInterface method for ISequentialStream but it includes the Read and Write methods through the IStream interface pointer.
When to Use
Call the methods of the ISequentialStream interface from a container or application to perform sequential read and write operations on data. Most applications call the Read and Write methods through the IStream interface.
Methods in Vtable Order
| IUnknown method | Description |
|---|---|
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| Method | Description |
|---|---|
| Read | Reads a specified number of bytes from the stream object into memory starting at the current seek pointer. |
| Write | Writes a specified number of bytes to the stream object starting at the current seek pointer. |
Remarks
To determine whether the platform supports this interface, see Determining Supported COM APIs.
Requirements
OS Versions: Windows CE 3.0 and later.
Header: Objidl.h, Objidl.idl.
Link Library: Ole32.lib, Uuid.lib.
See Also
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