CoGetInterfaceAndReleaseStream

Unmarshals a buffer containing an interface pointer and releases the stream when an interface pointer has been marshaled from another thread to the calling thread.

HRESULT CoGetInterfaceAndReleaseStream(
  LPSTREAM pStm,  //Pointer to the stream from which the object is 
                  // to be marshaled
  REFIID riid,    //Reference to the identifier of the interface
  LPVOID * ppv    //Address of output variable that receives the 
                  // interface pointer requested in riid
);
 

Parameters

pStm

[in] Pointer to the IStream interface on the stream to be unmarshaled.

riid

[in] Reference to the identifier of the interface requested from the unmarshaled object.

ppv

[out] Address of pointer variable that receives the interface pointer requested in riid. Upon successful return, *ppv contains the requested interface pointer to the unmarshaled interface.

Return Values

This function supports the standard return value E_INVALIDARG, as well as the following:

S_OK

Indicates the output interface was unmarshaled and the stream was released.

This function can also return any of the values returned by CoUnmarshalInterface.

Remarks

The CoGetInterfaceAndReleaseStream function performs the following tasks:

1. Calls CoUnmarshalInterface to unmarshal an interface pointer previously passed in a call to CoMarshalInterThreadInterfaceInStream.
2. Releases the stream pointer. Even if the unmarshaling fails, the stream is still released because there is no effective way to recover from a failure of this kind.

QuickInfo

  Windows NT: Use version 4.0 or later.
  Windows: Use Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in objbase.h.
  Import Library: Included as a resource in ole32.dll.

See Also

CoMarshalInterThreadInterfaceInStream, CoUnmarshalInterface