UCOMIStream Interface


The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Note: This API is now obsolete. Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

[ObsoleteAttribute("Use System.Runtime.InteropServices.ComTypes.IStream instead. http://go.microsoft.com/fwlink/?linkid=14202", 
public interface UCOMIStream


Creates a new stream object with its own seek pointer that references the same bytes as the original stream.


Ensures that any changes made to a stream object open in transacted mode are reflected in the parent storage.

System_CAPS_pubmethodCopyTo(UCOMIStream, Int64, IntPtr, IntPtr)

Copies a specified number of bytes from the current seek pointer in the stream to the current seek pointer in another stream.

System_CAPS_pubmethodLockRegion(Int64, Int64, Int32)

Restricts access to a specified range of bytes in the stream.

System_CAPS_pubmethodRead(Byte[], Int32, IntPtr)

Reads a specified number of bytes from the stream object into memory starting at the current seek pointer.


Discards all changes that have been made to a transacted stream since the last Commit call.

System_CAPS_pubmethodSeek(Int64, Int32, IntPtr)

Changes the seek pointer to a new location relative to the beginning of the stream, to the end of the stream, or to the current seek pointer.


Changes the size of the stream object.

System_CAPS_pubmethodStat(STATSTG, Int32)

Retrieves the STATSTG structure for this stream.

System_CAPS_pubmethodUnlockRegion(Int64, Int64, Int32)

Removes the access restriction on a range of bytes previously restricted with LockRegion.

System_CAPS_pubmethodWrite(Byte[], Int32, IntPtr)

Writes a specified number of bytes into the stream object starting at the current seek pointer.

For more information, please see the existing documentation for IStream and ISequentialStream in the com subfolder of the MSDN library.

.NET Framework
Available since 1.1
Return to top