MFCreateAsyncResult function (mfapi.h)

Creates an asynchronous result object. Use this function if you are implementing an asynchronous method.

Syntax

HRESULT MFCreateAsyncResult(
  IUnknown         *punkObject,
  IMFAsyncCallback *pCallback,
  IUnknown         *punkState,
  IMFAsyncResult   **ppAsyncResult
);

Parameters

punkObject

Pointer to the object stored in the asynchronous result. This pointer is returned by the IMFAsyncResult::GetObject method. This parameter can be NULL.

pCallback

Pointer to the IMFAsyncCallback interface. This interface is implemented by the caller of the asynchronous method.

punkState

Pointer to the IUnknown interface of a state object. This value is provided by the caller of the asynchronous method. This parameter can be NULL.

ppAsyncResult

Receives a pointer to the IMFAsyncResult interface. The caller must release the interface.

Return value

The function returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Remarks

To invoke the callback specified in pCallback, call the MFInvokeCallback function.

Requirements

See also

Asynchronous Callback Methods

Media Foundation Functions