Changes the size of the stream object.
HRESULT SetSize(
ULARGE_INTEGER libNewSize //Specifies the new size of the stream
// object
);
IStream::SetSize changes the size of the stream object. Call this method to preallocate space for the stream. If the libNewSize parameters larger than the current stream size, the stream is extended to the indicated size by filling the intervening space with bytes of undefined value. This operation is similar to the ISequentialStream::Write method if the seek pointer is past the current end-of-stream.
If the libNewSize parameter is smaller than the current stream, then the stream is truncated to the indicated size.
The seek pointer is not affected by the change in stream size.
Calling IStream::SetSize can be an effective way of trying to obtain a large chunk of contiguous space.
Windows NT: Use version 3.1 or later.
Windows: Use Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in objidl.h.
IStream - Compound File Implementation, ISequentialStream::Write