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L_DicomGetPrevKey

Summary

Returns a pointer to the item in the Dicom Dir Data Set that immediately precedes the specified item.

Syntax

#include "ltdic.h"

L_LTDIC_API pDICOMELEMENT L_DicomGetPrevKey(hDS, pElement, bTree)

Parameters

pDICOMELEMENT pElement

Pointer to a DICOMELEMENTstructure that contains an item in the Data Set. A pointer to the item in the Data Set that immediately precedes this item will be returned.

L_BOOL bTree

Flag that indicates how the Data Set will be evaluated. Possible values are:

Value	Meaning
TRUE	Evaluate the Data Set as a tree.
FALSE	Evaluate the Data Set as a list.

Returns

Value	Meaning
!NULL	A pointer to a DICOMELEMENTstructure that contains the item in the Data Set that immediately precedes the item specified in pElement.
NULL	There is not an item preceding pElement. (pElement is the first item in the Data Set.)

Comments

If the Data Set is evaluated as a tree structure, this function returns the previous item on the same level as pElement with the same parent as pElement. Please note that the numbering of the items in this illustration is arbitrary and does not imply order.

$image\GetPvTr.gif$

If the passed pointer points to	The function returns a pointer to
Item 1	Item 2
Item 3	Item 4
Item 5	NULL
Item 6	Item 7

If the Data Set is evaluated as a list, the previous item in the list is returned. Please note that the numbering of the items in this illustration does indicate the order of the items when the Data Set is evaluated as a list.

$image\GetPvLst.gif$