[This is preliminary documentation and subject to change.]
The ISequentialStream interface supports simplified sequential access to stream objects. The IStream interface inherits its Read and Write methods from ISequentialStream.
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 for ISequentialStream but it includes the Read and Write methods through the IStream interface pointer. The same is true for the NTFS Native Structured Storage implementation.
Call the methods of the ISequentialStream interface from a container or application to perform sequential reads and writes of data. Most applications call the Read and Write methods through the IStream interface.
| IUnknown Methods | Description |
|---|---|
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| ISequentialStream Methods | 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. |
Windows NT: Use version 4.0 or later.
Windows: Use Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in objidl.h.