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LDicomIOD::GetPrev

Summary

Returns a pointer to the item in the IOD Structure that immediately precedes the specified item.

Syntax

#include "Ltdic.h"

static pDICOMIOD LDicomIOD::GetPrev(pIOD, bTree)

Parameters

pDICOMIOD pIOD

Pointer to a DICOMIOD structure that contains an item in the IOD Structure. A pointer to the item in the IOD Structure that immediately precedes this item will be returned.

L_BOOL bTree

Flag that indicates how the IOD Structure will be evaluated. Possible values are:

Value	Meaning
TRUE	Evaluate the IOD Structure as a tree.
FALSE	Evaluate the IOD Structure as a list.

Returns

Value	Meaning
!NULL	A pointer to a DICOMIOD structure that contains the item in the IOD Structure that immediately precedes the item specified in pIOD.
NULL	There is not an item preceding pIOD. (pIOD is the first item in the IOD Structure.)

Comments

If the IOD Structure is evaluated as a tree structure, this function returns the previous item on the same level as pIOD with the same parent as pIOD.

NOTE: 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 IOD Structure is evaluated as a list, the previous item in the list is returned.

NOTE: The numbering of the items in this illustration does indicate the order of the items when the IOD Structure 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 IOD Structure as either a tree or a list:

If you evaluate the IOD Structure 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

Platforms

Win32, x64

Example

This example displays in a list-box control all classes from the IOD table.

L_INT LDicomIOD_GetPrevExample(CListBox *pDlg) 
{ 
   pDICOMIOD   pIOD; 
 
   pIOD = LDicomIOD::GetLast(NULL, TRUE); 
   while (pIOD != NULL) 
   { 
      pDlg->AddString(pIOD->pszName); 
 
      pIOD = LDicomIOD::GetPrev(pIOD, TRUE); 
   } 
   return DICOM_SUCCESS; 
}