LDicomDS::GetFirstKey

#include "ltdic.h"

pDICOMELEMENT LDicomDS::GetFirstKey(pElement, bTree)

pDICOMELEMENT pElement;

/* pointer to a DICOMELEMENT structure */

L_BOOL bTree;

/* flag that indicates how to evaluate the Data Set */

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

Parameter

Description

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.

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

!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:

LDicomDS::GetLastKey

LDicomDS::GetPrevKey

LDicomDS::GetNextKey

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

LDicomDS::GetRootKey

LDicomDS::GetParentKey

LDicomDS::GetChildKey

Required DLLs and Libraries

LTDIC

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application

See Also

Functions:

LDicomDS::GetLastKey, LDicomDS::GetPrevKey, LDicomDS::GetNextKey, LDicomDS::GetRootKey, LDicomDS::GetParentKey, LDicomDS::GetChildKey

Topics:

Working with Basic Directory Key Elements

 

How to Disable the Automatic Loading of the default DICOM IOD Table

Example

For an example, refer to LDicomDS::InsertKey.