IPhotoAcquireSource::InitializeItemList method (photoacquire.h)

Article
10/13/2021

The InitializeItemList method enumerates transferable items on the device and passes each item to the optional progress callback, if it is supplied.

Syntax

HRESULT InitializeItemList(
  [in]  BOOL                    fForceEnumeration,
  [in]  IPhotoAcquireProgressCB *pPhotoAcquireProgressCB,
  [out] UINT                    *pnItemCount
);

Parameters

[in] fForceEnumeration

Flag that, if set to TRUE, indicates that enumeration will be repeated even if the item list has already been initialized. If set to FALSE, this flag indicates that repeated calls to InitializeItemList after the item list has already been initialized will not enumerate items again.

[in] pPhotoAcquireProgressCB

Optional. Pointer to an IPhotoAcquireProgressCB object.

[out] pnItemCount

Returns the number of items found.

Return value

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

Return code	Description
S_OK	The method succeeded.
E_POINTER	Non-NULL pointer was expected.

Remarks

If IPhotoAcquire::Acquire is called without first calling InitializeItemList, initialization of the item list is done implicitly.

The first time the item list is initialized—either implicitly through IPhotoAcquire::Acquire or explicitly by calling InitializeItemList—each item is enumerated. During enumeration, if an IPhotoAcquireProgressCB object is passed to InitializeItemList, its implementation of StartEnumeration, FoundItem, and EndEnumeration may be used to apply further filtering or control to the list of items to be transferred.

Requirements

Requirement	Value
Target Platform	Windows
Header	photoacquire.h
Library	PhotoAcquireUID.lib

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