Removing digital signatures using the web service API

1.	Include project files

•	Create a Microsoft .NET client assembly that consumes the Signature WSDL. For information, see Creating a .NET client assembly.

•	Reference the Microsoft .NET client assembly. For information, see Referencing the .NET client assembly.

2.	Create a Signature client

Using the Microsoft .NET client assembly, create a SignatureServiceService object by invoking its default constructor.

3.	Get the PDF document that contains a signature to remove

•	Create a BLOB object by using its constructor. The BLOB object is used to store a PDF document that contains a digital signature to remove.

•	Create a System.IO.FileStream object by invoking its constructor and passing a string value that represents the file location of the signed PDF document and the mode in which to open the file.

•	Create a byte array that stores the content of the System.IO.FileStream object. You can determine the size of the byte array by getting the System.IO.FileStream object’s Length property.

•	Populate the byte array with stream data by invoking the System.IO.FileStream object’s Read method and passing the byte array, the starting position, and the stream length to read.

•	Populate the BLOB object by assigning its binaryData property with the contents of the byte array.

4.	Remove a digital signature

Remove the digital signature by invoking the SignatureServiceService object’s clearSignatureField method and passing the following values:

•	A BLOB object that contains the signed PDF document.

•	A string value that represents the name of the signature field that contains the digital signature to remove.

The clearSignatureField method returns a BLOB object that represents a PDF document from which the digital signature was removed.

5.	Save the PDF document

•	Create a System.IO.FileStream object by invoking its constructor and passing a string value that represents the file location of the PDF document that contains an empty signature field and the mode in which to open the file.

•	Create a byte array that stores the content of the BLOB object that was returned by the sign method. Populate the byte array by getting the value of the BLOB object’s binaryData data member.

•	Create a System.IO.BinaryWriter object by invoking its constructor and passing the System.IO.FileStream object.

•	Write the contents of the byte array to the PDF file by invoking the System.IO.BinaryWriter object’s Write method and passing the byte array.

Current page: http://livedocs.adobe.com/livecycle/es/sdkHelp/programmer/sdkHelp/signaturesClear.92.4.html