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This method determines if the implementation of the IMemInputPin::Receivemethod might block on the connected output pin.


HRESULT ReceiveCanBlock(void);



Return Value

Can return any HRESULTvalue.

The following specific success values can be returned.

Value Description


Input pin will not block on a Receivemethod.


Input pin might block on a Receivemethod.


An output pin from a filter might require notification if its thread might be blocked when it calls the Receivemethod on the connected input pin.

For example, a source filter might prefer to keep reading and buffering data rather than to be blocked, and may choose to start another thread to wait on the blocking Receivemethod.

If your implementation of Receivecalls a downstream filter's Receivemethod on the same thread, the application will block if that filter blocks, and this method must indicate that.


Windows Embedded CE Windows CE 2.12 and later
Windows Mobile Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment,
Version 2.12 requires DXPAK 1.0 or later

See Also