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GetSignedElement Method
See Also 
Leadtools.Dicom Namespace > DicomDataSet Class : GetSignedElement Method




signatureItem
The Digital Signatures Sequence Item that corresponds to the Digital Signature. This cannot be null.
index
The zero-based index of the required signed Data Element. This should be a number from 0 to GetSignedElementsCount(signatureItem) - 1.
Returns the signed Data Element at the specified index.

Syntax

Visual Basic (Declaration) 
Public Function GetSignedElement( _
   ByVal signatureItem As DicomElement, _
   ByVal index As Integer _
) As DicomElement
Visual Basic (Usage)Copy Code
Dim instance As DicomDataSet
Dim signatureItem As DicomElement
Dim index As Integer
Dim value As DicomElement
 
value = instance.GetSignedElement(signatureItem, index)
C# 
public DicomElement GetSignedElement( 
   DicomElement signatureItem,
   int index
)
Managed Extensions for C++ 
public: DicomElement* GetSignedElement( 
   DicomElement* signatureItem,
   int index
) 
C++/CLI 
public:
DicomElement^ GetSignedElement( 
   DicomElement^ signatureItem,
   int index
) 

Parameters

signatureItem
The Digital Signatures Sequence Item that corresponds to the Digital Signature. This cannot be null.
index
The zero-based index of the required signed Data Element. This should be a number from 0 to GetSignedElementsCount(signatureItem) - 1.

Return Value

The required signed Data Element. The return value can be a null reference (Nothing in Visual Basic); e.g., if the specified index is invalid.

Example

For an example, refer to VerifySignature.

Remarks

The Digital Signatures Sequence Item of a Digital Signature should reference an item under the Message Authentication Code (MAC) Parameters Sequence associated with the Digital Signatures Sequence. The Data Elements Signed (0400,0020) under the referenced MAC Parameters Sequence Item specifies the tags of the Data Elements covered by the Digital Signature. These Data Elements should be located at the same level as the MAC Parameters Sequence and the Digital Signatures Sequence.

The GetSignedElementsCount method returns the number of signed Data Elements as specified by the Data Elements Signed (0400,0020). The GetSignedElement method searches the level at which the MAC Parameters Sequence appears for the Data Element with the tag determined by the passed index and returns the Data Element if it does exist; if it does not exist, the method returns a null reference (Nothing in Visual Basic).

Note: In addition to the Data Elements specified by the Data Elements Signed (0400,0020), certain Data Elements under the Digital Signatures Sequence Item are always covered by the Digital Signature.

The following methods can also be used to get information about the Digital Signature:

GetSignatureUID

GetSignatureDateTime

GetMacTransferSyntax

GetMacAlgorithm

SaveCertificate

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Leadtools.Dicom requires a Medical toolkit license and unlock key. For more information, refer to: Raster Pro/Document/Medical Features