CTransformInputPin.QueryId method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
The QueryId method retrieves an identifier for the pin. This method implements the IPin::QueryId method.
Syntax
HRESULT QueryId(
LPWSTR *Id
);
Parameters
-
Id
-
Receives a string containing the pin identifier.
Return value
Returns one of the HRESULT values shown in the following table.
| Return code | Description |
|---|---|
|
Success |
|
Insufficient memory |
|
NULL pointer argument |
Remarks
The pin identifier is used for graph persistence. The pin identifier for this class is In. This class overrides the behavior of the CBasePin class. In the CBasePin class, the pin identifier is the same as the pin name, specified in the class constructor. In the CTransformInputPin class, the pin identifier and the pin name are not the same.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|