L_DicomGetFirstKey

#include "ltdic.h"

L_LTDIC_API pDICOMELEMENT L_DicomGetFirstKey(hDS, pElement, bTree)

Returns a pointer to the first item in the Dicom Dir Data Set.

Parameters

HDICOMDS hDS

A DICOM handle.

pDICOMELEMENT pElement

Pointer to a DICOMELEMENT structure within the Data Set. A pointer to the DICOMELEMENT structure that contains the first item in the Data Set 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 DICOMELEMENT structure that contains the first item in the Data Set.
NULL The Data Set is empty.

Comments

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

image\GetFstTr.gif
If the passed pointer points to The function returns a pointer to
Item 1 Item 2
Item 3 Item 4
Item 5 Item 5
Item 6 Item 7
NULL Item 2

If the Data Set is evaluated as a list, the first 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\GetFtLst.gif
If the passed pointer points to The function returns a pointer to
NULL Item 1
Item 12 Item 1
Item 14 Item 1
Item 22 Item 1
Item 25 Item 1

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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