L_DicomGetPrevKey

#include "ltdic.h"

L_LTDIC_API pDICOMELEMENT L_DicomGetPrevKey(hDS, pElement, bTree)

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

Parameters

HDICOMDS hDS

A DICOM handle.

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
If the passed pointer points to The function returns a pointer to
Item 1 NULL
Item 15 Item 14
Item 5 Item 4
Item 9 Item 8
Item 22 Item 21
Item 25 Item 24

The following functions will also help you navigate the Data Set as either a tree or a list:

If you evaluate the Data Set as a tree, you can also use the following functions to navigate the tree:

Required DLLs and Libraries

Platforms

Win32, x64, Linux.

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