L_DicomGetSignature

#include "ltdic.h"

L_LTDIC_API pDICOMELEMENT L_DicomGetSignature(hDS, pItem, uIndex)

Returns a pointer to the Digital Signatures Sequence Item that corresponds to the Digital Signature at the specified index.

Parameters

HDICOMDS hDS

A DICOM handle.

pDICOMELEMENT pItem

Pointer to a DICOMELEMENT structure that specifies the Item in which the required Digital Signature is located. Set this parameter to NULL if the Digital Signature is located in the main Data Set.

L_UINT32 uIndex

The index of the required Digital Signature. This should be a number from 0 to L_DicomGetSignaturesCount(pItem) minus 1.

Returns

Comments

For each Digital Signature in the main Data Set or in an Item of a Sequence of Items, there should be a corresponding Item under the Digital Signatures Sequence (FFFA,FFFA) located in the main Data Set or in the Item. This function can be used to obtain a pointer to that Digital Signatures Sequence Item.

Along with this function, the function L_DicomGetSignaturesCount can be used to enumerate the Digital Signatures in the main Data Set or in an Item of a Sequence of Items. Once a pointer to the Digital Signatures Sequence Item is obtained, the following functions can be used to verify, delete, or get information about the Digital Signature:

• L_DicomVerifySignature
• L_DicomDeleteSignature
• L_DicomGetSignatureUID
• L_DicomGetSignatureDateTime
• L_DicomGetSignedElementsCount
• L_DicomGetSignedElement
• L_DicomGetMacTransferSyntax
• L_DicomGetMacAlgorithm
• L_DicomSaveCertificate

You can also use the function L_DicomFindSignature to search the whole Data Set for a specific Digital Signature.

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 DicomGetSignatureExample(HDICOMDS hDS) 
{ 
   // We will enumerate the Digital Signatures in the main Data Set 
   L_TCHAR szMsg[128]; 
   L_UINT32 i; 
   L_INT nRet; 
 
   L_UINT32 uSignaturesCount = L_DicomGetSignaturesCount(hDS,NULL); 
   if (uSignaturesCount == 0) 
   { 
      MessageBox(NULL, 
                   TEXT("There are no Digital Signatures in the main Data Set."), 
                   TEXT("Sample"), 
                   MB_OK); 
      return FAILURE - 1; 
   } 
    
   if (uSignaturesCount == 1) 
   { 
      lstrcpy(szMsg, 
              TEXT("There is 1 Digital Signature in the main Data Set. ") 
              TEXT("Do you want to examine it?")); 
   } 
   else 
   { 
      wsprintf(szMsg, 
               TEXT("There are %lu Digital Signatures in the main Data Set. ") 
               TEXT("Do you want to examine them?"), uSignaturesCount); 
   } 
 
   if (MessageBox(NULL, szMsg, TEXT("Sample"), MB_YESNO) != IDYES) 
      return FAILURE - 1; 
 
   for (i = 0; i < uSignaturesCount; i++) 
   { 
      // Refer to the example of L_DicomVerifySignature for the 
      // function DicomVerifySignatureExample 
      nRet = DicomVerifySignatureExample(hDS, L_DicomGetSignature(hDS,NULL, i)); 
      if (nRet != SUCCESS) 
         return nRet; 
   } 
 
   return DICOM_SUCCESS; 
}