LDicomDS::GetNextElement

#include "Ltdic.h"

pDICOMELEMENT LDicomDS::GetNextElement(pElement, bTree, bVolatile)

Returns a pointer to the item in the Data Set that immediately follows the specified item.

Returns

Comments

If the Data Set is evaluated as a tree structure, this function returns the next 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 Data Set is evaluated as a list, the next 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.

The following functions will also help you navigate the Data Set as either a tree or a list:

LDicomDS::GetFirstElement

LDicomDS::GetPrevElement

LDicomDS::GetLastElement

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

LDicomDS::GetRootElement

LDicomDS::GetParentElement

LDicomDS::GetChildElement

A volatile element is an element that can be changed or destroyed in the process of inserting or setting an image. A non-volatile element is an element that must be changed manually. It is not changed or destroyed by inserting or setting an image.

For example, a grayscale image has elements TAG_SMALLEST_IMAGE_PIXEL_VALUE, TAG_LARGEST_IMAGE_PIXEL_VALUE, etc. If the image is changed to a color image, these elements disappear and the following elements appear: TAG_RED_PALETTE_COLOR_LOOKUP_TABLE_DESCRIPTOR, etc. These are volatile elements since they are changed or destroyed when an image is changed or set.

To retrieve the next element that must be changed manually, i.e. is not volatile, set bVolatile to FALSE. To retrieve the next element, either volatile or non-volatile, set bVolatile to TRUE.

Required DLLs and Libraries

Platforms

Win32, x64

L_INT LDicomDS_GetNextElementExample(CListBox *pDlg) 
{ 
   LDicomDS*      pDS; 
   pDICOMELEMENT  pElement; 
   pDICOMTAG      pTag; 
   L_TCHAR        szUnknown[]=TEXT("Unknown"); 
   L_TCHAR*       p; 
   pDS = new LDicomDS(NULL); 
   pDS->InitDS( CLASS_XA_BIPLANE_IMAGE_STORAGE_RETIRED, 0); 
   pElement = pDS->GetFirstElement(NULL, TRUE, FALSE); 
   while (pElement != NULL) 
   { 
      pTag = LDicomTag::Find(pElement->nTag); 
      if (pTag != NULL) 
      { 
         p = pTag->pszName; 
      } 
      else 
      { 
         p = szUnknown; 
      } 
      pDlg->AddString(p); 
      pElement = pDS->GetNextElement(pElement, TRUE, FALSE); 
   } 
   delete pDS; 
   return DICOM_SUCCESS; 
}