LDicomDS::GetPrevKey
#include "ltdic.h"
pDICOMELEMENT LDicomDS::GetPrevKey(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 item in the Dicom Dir Data Set that immediately precedes the specified item.
| Parameter | Description | |
| pElement | Pointer to a DICOMELEMENT structure 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. | |
| 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 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.
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.
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
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 |
Win32, x64
Example
For an example, refer to LDicomDS::InsertKey.
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