| Microsoft DirectX 9.0 |
The Block method blocks or unblocks the flow of data from the pin. This method implements the IPinFlowControl::Block method.
Syntax
HRESULT Block(
DWORD dwBlockFlags,
HANDLE hEvent
);
Parameters
dwBlockFlags
Flag that indicates whether to block or unblock the pin. Must be one of the following values:
Zero: Unblock data flow from the pin.
AM_PIN_FLOW_CONTROL_BLOCK: Block data flow from the pin.
hEvent
Handle to an event object, or NULL.
Return Value
Returns an HRESULT value. Possible values include those shown in the following table.
| Value | Description |
| S_FALSE | Pin is already unblocked. |
| S_OK | Success. |
| E_INVALIDARG | Invalid argument. |
| VFW_E_PIN_ALREADY_BLOCKED | Pin is already blocked on another thread. |
| VFW_E_PIN_ALREADY_BLOCKED_ON_THIS_THREAD | Pin is already blocked on the calling thread. |
Remarks
For more information about this method, see IPinFlowControl::Block. Internally, this method calls one of the following protected methods:
Unblocking is always performed synchronously.
See Also