|
IStream::SetSize
Changes the size of the stream object.
HRESULT SetSize(
ULARGE_INTEGER libNewSize
| //Specifies the new size of the stream object
| );
|
|
Parameter
libNewSize
[in]Specifies the new size of the stream as a number of bytes.
Return Values
S_OK
The size of the stream object was successfully changed.
STG_E_MEDIUMFULL
The stream size is not changed because there is no space left on the storage
device.
STG_E_INVALIDFUNCTION
The value of the libNewSize parameter is not valid. Since streams cannot be greater than 2 (32) bytes in the OLE-provided implementation, the high DWORD of libNewSize must be 0. If it is nonzero, this parameter is not valid.
Comments
This method changes the size of the stream object. You can use this method to
preallocate space for the stream. If the libNewSize parameteris 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 IStream::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 is an effective way of trying to obtain a large chunk of contiguous space.
However, in the OLE-provided implementation of streams, there is no guarantee
that the space will be contiguous.
See Also
IStream::Write
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