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DD_DXAPI_UNREGISTER_CALLBACK Control Code (Windows Drivers)
Learn more about the DD_DXAPI_UNREGISTER_CALLBACK control code.
DD_DXAPI_UNREGISTER_CALLBACK
ddkmapi/DD_DXAPI_UNREGISTER_CALLBACK
10/12/2022

DD_DXAPI_UNREGISTER_CALLBACK control code

A video capture driver passes DD_DXAPI_UNREGISTER_CALLBACK in the dwFunctionNum parameter of the DxApi function to release the registration of a previously-registered callback.

Input Parameters

  • lpvInBuffer
    Pointer to a DDREGISTERCALLBACK structure that contains the information required to release a callback.

Output Parameters

  • lpvOutBuffer
    Pointer to a DWORD that contains the DirectDraw return value.

Remarks

This function identifier can only release one event at a time.

This function identifier can only be called at PASSIVE_LEVEL.

Requirements

Header

 Ddkmapi.h (include Ddkmapi.h)

See also

DDREGISTERCALLBACK