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LDicomDS::GetCharValue

Summary

Returns a pointer to a char value, stored in the value field, of the specified element.

Syntax

#include "Ltdic.h"

L_UCHAR * LDicomDS::GetCharValue(pElement, nIndex, nCount)

Parameters

pDICOMELEMENT pElement

Pointer to a DICOMELEMENT structure within the Data Set.

L_UINT32 nIndex

Index value that indicates which value to retrieve when more than one value is stored in the Value Field. The index is zero-based.

L_UINT32 nCount

Value that indicates the number of values to retrieve when more than one value is stored in the Value Field. In most instances you will only retrieve one value so this parameter will be one.

Returns

Value	Meaning
!NULL	A pointer to a char stored in the Value Field of the specified Data Element.
NULL	The length of the Value Field is 0, the function was called for the incorrect VR type, or the function was called for a folder (sequence) element.

Comments

If you have more than one value stored in the Value Field of the specified Data Element, you can retrieve one or more than one of those elements. For example, if the Value Field of the specified Data Element contains three character values, and you are only interested in retrieving the last two character values, set nIndex to 1 and nCount to 2. This tells the function to retrieve the character values starting at position 1 (the index is zero based) and retrieve two values. Therefore you would retrieve the values in positions 1 and 2 in the Value Field.

This function can be called only if the Value Representation of the Data Element is VR_OB, VR_SQ, or VR_UN. For more information about Value Representations, refer to Default Value Representation Table.

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 gets the value for an element.

L_VOID ShowValue(CListBox *pDlg, LDicomDS *pDS, pDICOMELEMENT pElement) 
{ 
   L_INT32         i; 
   L_INT32         nCount; 
   L_TCHAR         szText[256]; 
   L_TCHAR         *pStringValue; 
   L_UCHAR        *pChar; 
   L_INT16        *pShort; 
   L_INT32        *pLong; 
   L_FLOAT        *pFloat; 
   L_DOUBLE       *pDouble; 
   pVALUEAGE       pAge; 
   pVALUEDATE      pDate; 
   pVALUETIME      pTime; 
   pVALUEDATETIME  pDateTime; 
 
   nCount = pDS->GetCountValue(pElement); 
 
   if (((pElement->nLength == ELEMENT_LENGTH_MAX)) ||  
      (pElement->nLength > 1024) ||  
      (nCount == 0)) 
   { 
      return; 
   } 
 
   switch (pElement->nVR) 
   { 
   case VR_OB:    // Other Byte String 
   case VR_UN:    // Unknown 
      pChar = pDS->GetCharValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%02X"), (L_UCHAR)pChar[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_SS:    // Signed Short 
      pShort = pDS->GetShortValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%d"), pShort[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_US:    // Unsigned Short 
   case VR_OW:    // Other Word String 
      pShort = pDS->GetShortValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%u"), (L_UINT16)pShort[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_SL:    // Signed Long 
   case VR_IS:    // Integer String 
      pLong = pDS->GetLongValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%ld"), pLong[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_UL:    // Unsigned Long 
      pLong = pDS->GetLongValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%lu"), (L_UINT32)pLong[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_AT:    // Attribute Tag 
      pLong = pDS->GetLongValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%04X:%04X"), GETGROUP((L_UINT32)pLong[i]), 
            GETELEMENT((L_UINT32)pLong[i])); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_FL:    // Floating Point Single 
      pFloat = pDS->GetFloatValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%f"), pFloat[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_FD:    // Floating Point Double 
   case VR_DS:    // Decimal String 
      pDouble = pDS->GetDoubleValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%f"), pDouble[i]); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_CS:    // Code String 
   case VR_SH:    // Short String 
   case VR_LO:    // Long String 
   case VR_AE:    // Application Entity 
   case VR_LT:    // Long Text 
   case VR_ST:    // Short Text 
   case VR_UI:    // Unique Identifier 
   case VR_UT:    // Unlimited Text 
   case VR_PN:    // Person Name 
      pStringValue = pDS->GetStringValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         pDlg->AddString(pStringValue); 
         pStringValue = pStringValue + wcslen(pStringValue) + 1; 
      } 
      break; 
 
   case VR_AS:    // Age String 
      pAge = pDS->GetAgeValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%u "), pAge[i].nNumber); 
         switch (pAge[i].nReference) 
         { 
         case VALUE_AGE_DAYS: 
            wcscat_s(szText, 256, TEXT("days")); 
            break; 
         case VALUE_AGE_WEEKS: 
            wcscat_s(szText, 256, TEXT("weeks")); 
            break; 
         case VALUE_AGE_MONTHS: 
            wcscat_s(szText, 256, TEXT("months")); 
            break; 
         case VALUE_AGE_YEARS: 
            wcscat_s(szText, 256, TEXT("years")); 
            break; 
         } 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_DA:    // Date 
      pDate = pDS->GetDateValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%02u/%02u/%u"), pDate[i].nMonth, pDate[i].nDay, pDate[i].nYear); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_TM:    // Time 
      pTime = pDS->GetTimeValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%02u:%02u:%u.%lu"), pTime[i].nHours, pTime[i].nMinutes, 
            pTime[i].nSeconds, pTime[i].nFractions); 
         pDlg->AddString(szText); 
      } 
      break; 
 
   case VR_DT:    // Date Time 
      pDateTime = pDS->GetDateTimeValue(pElement, 0, nCount); 
      for (i = 0; i < nCount; i++) 
      { 
         wsprintf(szText, TEXT("%d  %02u/%02u/%u  %02u:%02u:%u.%lu&%lu"),  
            pDateTime[i].nMonth, pDateTime[i].nDay, 
            pDateTime[i].nYear, pDateTime[i].nHours, pDateTime[i].nMinutes, 
            pDateTime[i].nSeconds, pDateTime[i].nFractions,  
            pDateTime[i].nOffset); 
         pDlg->AddString(szText); 
      } 
      break; 
   } 
 
   pDS->FreeValue(pElement); 
} 
 
L_INT LDicomDS_GetCharValueExample(CListBox *pDlg) 
{ 
   L_INT          nRet; 
   LDicomDS      *pDS; 
   pDICOMELEMENT  pElement; 
 
   pDS = new LDicomDS(NULL); 
 
   nRet = pDS->LoadDS(MAKE_IMAGE_PATH(TEXT("image1.dcm")), 0); 
   if(nRet != DICOM_SUCCESS) 
      return nRet; 
 
   pElement = pDS->FindFirstElement(NULL, TAG_PATIENT_NAME, FALSE); 
   if (pElement != NULL) 
   { 
      ShowValue(pDlg, pDS, pElement); 
   } 
 
   delete pDS; 
 
   return DICOM_SUCCESS; 
}