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 file: Ddkmapi.h (include Ddkmapi.h)

See also

DDREGISTERCALLBACK