LDicomIOD::GetPrev

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#include "Ltdic.h"

static pDICOMIOD LDicomIOD::GetPrev(pIOD, bTree)

pDICOMIOD pIOD;	/* pointer to a DICOMIOD structure */
L_BOOL bTree;	/* flag that indicates how to evaluate the IOD Structure */

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

Parameter	Description
pIOD	Pointer to a DICOMIODstructure 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.
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

!NULL	A pointer to a DICOMIODstructure 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. Please note that 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. Please note that 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:

LDicomIOD::GetFirst

LDicomIOD::GetLast

LDicomIOD::GetNext

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

LDicomIOD::GetRoot

LDicomIOD::GetParent

LDicomIOD::GetChild

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

See Also

Functions:	LDicomIOD::GetFirst, LDicomIOD::GetLast, LDicomIOD::GetNext, LDicomIOD::GetCountModule, LDicomIOD::GetRoot, LDicomIOD::GetParent, LDicomIOD::GetChild
Topics:	Working with Information Object Definitions
	How to Disable the Automatic Loading of the default DICOM IOD Table

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;
}