LDicomDS::FindFirstElement

#include "Ltdic.h"

pDICOMELEMENT LDicomDS::FindFirstElement(pElement, nTag, bTree)

Returns a pointer to the first item in the Data Set with the specified tag.

Parameters

pDICOMELEMENT pElement

Pointer to a DICOMELEMENT structure within the Data Set.

L_UINT32 nTag

Tag that specifies the item to find. For a list of default tag values, refer to Data Element Tag Constants.

L_BOOL bTree

Flag that indicates how the Data Set will be evaluated. Possible values are:

Returns

Comments

If the Data Set is evaluated as a tree structure, this function returns the first item on the same level as pElement with the same parent as pElement, that has tag nTag.

For the sake of these illustrations, the order of siblings is top to bottom. Therefore first is evaluated top to bottom.

NOTE: The numbering of the items of interest in this first illustration is arbitrary and does not imply order.

If the Data Set is evaluated as a list, this function returns the first item in the entire list that has tag nTag. The search begins at the top of the list.

For the sake of these illustrations, the order of siblings is top to bottom. Therefore first is evaluated top to bottom.

NOTE: 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 find elements in the Data Set with a specific tag:

LDicomDS::FindLastElement

LDicomDS::FindPrevElement

LDicomDS::FindNextElement

The following functions will help you find specific modules in the Data Set:

LDicomDS::FindModule

LDicomDS::FindIndexModule

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

L_INT LDicomDS_FindFirstElementExample(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->FindFirstElement(NULL, TAG_SOP_CLASS_UID, FALSE); 
   if (pElement != NULL) 
   { 
      pTag = LDicomTag::Find(pElement->nTag); 
      if (pTag != NULL) 
      { 
         p = pTag->pszName; 
      } 
      else 
      { 
         p = szUnknown; 
      } 
 
      pDlg->AddString(p); 
 
      pElement = pDS->FindNextElement(pElement, FALSE); 
   } 
 
   delete pDS; 
 
   return DICOM_SUCCESS; 
}