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IBaseFilter::FindPin

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This method retrieves the pin with the specified identifier.

HRESULT FindPin(
  LPCWSTR Id,
  IPin** ppPin
);

Parameters

  • Id
    [in] Identifier of the pin.
  • ppPin
    [out] Pointer to the IPin interface for this pin after the filter has been restored. The returned IPin pointer has been reference counted. The caller should use the Release method on the pointer when finished with it.

Return Values

Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants or other values not listed.

Value Description
E_FAIL Failure.
E_POINTER Null pointer argument.
E_INVALIDARG Invalid argument.
E_NOTIMPL Method is not supported.
S_OK or NOERROR Success.

Remarks

This method, along with the IPin::QueryId method, is used to implement persistent filter graphs. A filter must be able to translate the IPin interface pointers to its pins into identifiers that can be saved along with the configuration of the filter graph. It does this by using the IPin::QueryId method. It must then be able to convert those identifiers back into IPin interface pointers when the filter and its connections are restored as part of a persistent filter graph. This is accomplished by using the IBaseFilter::FindPin method.

The ppPin parameter is set to NULL if the identifier cannot be matched.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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