CBasePin.CBasePin constructor
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Constructor method.
Syntax
CBasePin(
TCHAR *pObjectName,
CBaseFilter *pFilter,
CCritSec *pLock,
HRESULT *phr,
LPCWSTR pName,
PIN_DIRECTION dir
);
Parameters
-
pObjectName
-
String containing the debug name for the object. For more information, see CBaseObject.
-
pFilter
-
Pointer to the filter that created this pin.
-
pLock
-
Pointer to a CCritSec lock, used to serialize state changes. Can be the same critical section as the filter lock, CBaseFilter::m_pLock.
-
phr
-
Pointer to a variable that receives an HRESULT value indicating the success or failure of the method. Initialize the value to S_OK before creating the object. The value is changed only if an error occurs.
-
pName
-
Wide-character string containing the name of the pin. For more information, see CBasePin::QueryPinInfo.
-
dir
-
Member of the PIN_DIRECTION enumeration specifying the direction of the pin.
Remarks
The critical section specified by pLock serializes the pin's state, including its connection status, choice of allocator, media type, and the status of flush operations. Do not use this critical section to serialize streaming operations. For more information, see Data Flow in the Filter Graph.
A filter might create pins in its constructor method, so at this point the pFilter pointer might not refer to a valid object. Store the pointer, but do not dereference it while inside the pin's constructor.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
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