L_DicomFindNextDescendant
#include "Ltdic.h"
L_LTDIC_API pDICOMELEMENT L_DicomFindNextDescendant(hDS, pParent, pElement, bNextLevelOnly)
Returns a pointer to the next item in the Data Set with a specific tag.
| Parameter | Description | |
| hDS | A DICOM handle. | |
| pParent | Pointer to a parent DICOMELEMENT structure within the Data Set. | |
| pElement | Pointer to a child DICOMELEMENT structure of pParent. | |
| bNextLevelOnly | Flag that indicates how the Data Set will be evaluated. Possible values are: | |
| Value | Meaning | |
| TRUE | Search for items in the next level only. | |
| FALSE | Search for items recursively in all of the next levels. | |
Returns
| !NULL | A pointer to a DICOMELEMENT structure that contains the next item in the Data Set having the specified tag. |
| NULL | No item with the specified tag was found. |
Comments
NOTE: Call L_DicomFindFirstDescendant before calling L_DicomFindNextDescendant. L_DicomFindNextDescendant does not specify a tag to use when searching. However, the tag that was used in the last call to L_DicomFindFirstDescendant is used by default when searching.
This function finds the next descendant of the pElement that has a DICOM tag equivalent to the nTag argument (L_DicomFindFirstDescendant), where the entire search is rooted at the Parent element (i.e. pParent).
The diagram below represents DICOM elements stored in a DICOM dataset.
Behavior when bNextLevelOnly is TRUE:
Returns the next element on the next level of pParent with that has a tag equivalent to the nTag argument used in the previous call to L_DicomFindFirstDescendant. Elements included in the search include child elements in the next level only, starting with the element pointed to by pElement. .
Example 1
bNextLevelOnly TRUE
pParent points to element 1
pElement points to element 8
Searches elements 11, 12 and returns the first element that matches the nTag argument used in the previous call to L_DicomFindFirstDescendant.
Example 2
bNextLevelOnly TRUE
pParent points to element 2
pElement points to element 3
Searches elements 4, 7 and returns the first element that matches the nTag argument used in the previous call to L_DicomFindFirstDescendant.
Example 3
bNextLevelOnly TRUE
pParent pointing to element 4
pElement points to element 5
Searches eSearches element 6 only, and returns element 6 if it has a tag of the nTag ent used in the previous call to L_DicomFindFirstDescendant.
Example 4
bNextLevelOnly TRUE
pParent pointing to element 1
pElement points to element 12
Returns NULL.
Behavior when bNextLevelOnly is FALSE:
Returns the next item that has a tag equivalent to the nTag argument used in the previous call to L_DicomFindFirstDescendant ( a pre-order search algorithm rooted at pParent.)
Example 5
bNextLevelOnly FALSE
pParent pointing to element 1
pElement points to element 4
Searches elements 5, 6, 7, 8, 9, 10, 11, 12 and returns the first element that matches the nTag argument used in the previous call to L_DicomFindFirstDescendant.
Example 6
bNextLevelOnly FALSE
pParent pointing to element 2
pElement points to element 4
Searches elements 5, 6, 7 and returns the first element that matches the nTag argument used in the previous call to L_DicomFindFirstDescendant.
Example 7
bNextLevelOnly FALSE
pParent pointing to element 4
pElement points to element 5
Searches eSearches element 6 only, and returns element 6 if is has a tag of nTag argument used in the previous call to L_DicomFindFirstDescendant
The following functions will also help you find elements in the Data Set with a specific tag:
The following functions will help you find specific modules in the Data Set:
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, Linux.
| Functions: | L_DicomFindFirstElement, L_DicomFindLastElement, L_DicomFindPrevElement, L_DicomFindModule, L_DicomFindIndexModule, L_DicomFindFirstDescendant |
| Topics: | Working with Data Sets |
Example
For an example, refer to L_DicomFindFirstDescendant.
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