|
CoMarshalInterThreadInterfaceInStream
Passes streams containing interfaces between different threads, and is a
helper that allows you to pass interface pointers easily and correctly between
threads.
HRESULT CoMarshalInterThreadInterfaceInStream(
REFIID riid,
| //Interface exposed by the object to be marshaled
| LPUNKNOWN pUnk,
| //Points to the object to be marshaled
| LPSTREAM * ppStm
| //Output pointer to the stream interface
| );
|
|
Parameters
riid
Specifies the interface that is to be marshalled.
pUnk
Points to the IUnknown of the object to be marshalled, thus specifying the object.
ppStm
[Out] On return, points to the stream containing the interface .
Return Values
S_OK
Output stream contains marshalled interface.
E_OUTOFMEMORY
There was not enough memory to complete the call.
E_INVALIDARG
One or more arguments are invalid.
Comments
CoMarshalInterThreadInterfaceInStream is a helper function that facilitates passing streams containing interfaces
between threads, although you could implement it yourself from existing APIs if
desired. It creates a stream and passes it to CoMarshalInterface, then passes the pointer to that stream back to the caller. The stream it
returns is guaranteed to behave correctly when different threads access it. The
receiving thread can then call the corresponding helper function CoGetInterfaceAndReleaseStream to get the interface pointer and release the stream object.
See Also
CoGetInterfaceAndReleaseStream
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