IUnknown::AddRef method

Note  This topic describes IUnknown in the context of the AVIFile and AVIStream interfaces. For general information about IUnknown, see the Component Object Model (COM) documentation in the Windows SDK.

The AddRef method increments the reference count of the appropriate handler: IAVIEditStream, IAVIFile, IAVIStream, IAVIStreaming, or IGetFrame. When the reference count is nonzero, the handler must retain resources for the file or stream.

Syntax

ULONG AddRef(
   LPUNKNOWN ps
);

Parameters

• ps
  Pointer to an IAVIEditStream, IAVIFile, IAVIStream, IAVIStreaming, or IGetFrame interface.

Return value

Returns the resulting reference count.

Remarks

For handlers written in C++, AddRef has the following syntax:

HRESULT AddRef(VOID); 
 

Requirements

See also

Custom File and Stream Handlers

Custom File and Stream Handler Interfaces