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MFPutWorkItem function

Puts an asynchronous operation on a work queue.

Syntax


HRESULT MFPutWorkItem(
  _In_  DWORD dwQueue,
  _In_  IMFAsyncCallback *pCallback,
  _In_  IUnknown *pState
);

Parameters

dwQueue [in]

The identifier for the work queue. This value can specify one of the standard Media Foundation work queues, or a work queue created by the application. For list of standard Media Foundation work queues, see Work Queue Identifiers. To create a new work queue, call MFAllocateWorkQueue or MFAllocateWorkQueueEx.

pCallback [in]

A pointer to the IMFAsyncCallback interface. The caller must implement this interface.

pState [in]

A pointer to the IUnknown interface of a state object, defined by the caller. This parameter can be NULL. You can use this object to hold state information. The object is returned to the caller when the callback is invoked.

Return value

Returns an HRESULT value. Possible values include the following.

Return codeDescription
S_OK

Success.

MF_E_INVALID_WORKQUEUE

Invalid work queue. For more information, see IMFAsyncCallback::GetParameters.

MF_E_SHUTDOWN

The MFStartup function was not called, or MFShutdown was called.

 

Remarks

This function creates an asynchronous result object and puts the result object on the work queue. The work queue calls the IMFAsyncCallback::Invoke method specified by pCallback.

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Mfapi.h

Library

Mfplat.lib

DLL

Mfplat.dll

See also

Media Foundation Functions
Work Queues
MFPutWorkItemEx

 

 

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