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(SQL Server) PDF Sign Unsigned Signature Field
Demonstrates how to sign a PDF's unsigned signature field.
Note: This example requires Chilkat v9.5.0.85 or greater.
-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
DECLARE @hr int
-- Important: Do not use nvarchar(max). See the warning about using nvarchar(max).
DECLARE @sTmp0 nvarchar(4000)
-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.
DECLARE @pdf int
-- Use "Chilkat_9_5_0.Pdf" for versions of Chilkat < 10.0.0
EXEC @hr = sp_OACreate 'Chilkat.Pdf', @pdf OUT
IF @hr <> 0
BEGIN
PRINT 'Failed to create ActiveX component'
RETURN
END
-- Load a PDF containing an unsigned signature field.
DECLARE @success int
EXEC sp_OAMethod @pdf, 'LoadFile', @success OUT, 'qa_data/pdf/unsigned_sig_field/due_diligence.pdf'
IF @success = 0
BEGIN
EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
PRINT @sTmp0
EXEC @hr = sp_OADestroy @pdf
RETURN
END
-- A PDF with an unsigned signature field appears in Adobe Acrobat as shown below.
-- (When the mouse pointer is hovered over the field, a tooltip will likely show a message
-- such as "Unsigned signature field (Click to sign)".
-- This example code will automatically find the unsigned signature field,
-- and signs using your certificate. It automatically sizes the text to the space alotted
-- for the signature.
-- Options for signing are specified in JSON.
DECLARE @json int
-- Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT
-- In most cases, the signingCertificateV2 and signingTime attributes are required.
EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'signingCertificateV2', 1
EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'signingTime', 1
-- We don't specify the page or a specific location because Chilkat will automatically
-- find the unsigned signature field and use its location and size and will scale the
-- signatures visual appearance (text + graphics) to the correct size required to fit.
-- We only need to indicate the desire to fill the unsigned signature field.
EXEC sp_OAMethod @json, 'UpdateBool', @success OUT, 'appearance.fillUnsignedSignatureField', 1
-- Starting in Chilkat v9.5.0.90, if a PDF contains multiple unsigned signature fields,
-- the field to be signed can be chosen by name:
-- To list unsigned signature fields, see this example: List PDF Unsigned Signature Fields
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'unsignedSignatureField', 'doctor_signature'
-- Note: If the PDF document contains multiple unsigned signature fields, Chilkat will
-- sign the 1st one found.
-- In this example, the appearance of the digital signature will contain three lines:
-- 1) The signing certificate's common name
-- 2) The current date/time
-- 3) Some arbitrary text.
-- The keyword "cert_cn" is replaced with the Certificate's Subject Common Name.
-- The keyword "current_dt" is replaced with the current date/time.
-- Any number of appearance text lines can be added.
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[0]', 'Digitally signed by: cert_cn'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[1]', 'current_dt'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[2]', 'The crazy brown fox jumps over the lazy dog.'
-- This signature will include one of the built-in SVG graphics (green-check-grey-circle).
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.image', 'green-check-grey-circle'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imagePlacement', 'left'
-- Load the signing certificate. (Use your own certificate.)
DECLARE @cert int
-- Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT
EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/pfx/myPdfSigningCert.pfx', 'secret'
IF @success = 0
BEGIN
EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
PRINT @sTmp0
EXEC @hr = sp_OADestroy @pdf
EXEC @hr = sp_OADestroy @json
EXEC @hr = sp_OADestroy @cert
RETURN
END
-- Tell the pdf object to use the certificate for signing.
EXEC sp_OAMethod @pdf, 'SetSigningCert', @success OUT, @cert
IF @success = 0
BEGIN
EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
PRINT @sTmp0
EXEC @hr = sp_OADestroy @pdf
EXEC @hr = sp_OADestroy @json
EXEC @hr = sp_OADestroy @cert
RETURN
END
EXEC sp_OAMethod @pdf, 'SignPdf', @success OUT, @json, 'qa_output/due_diligence_signed.pdf'
IF @success = 0
BEGIN
EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
PRINT @sTmp0
EXEC @hr = sp_OADestroy @pdf
EXEC @hr = sp_OADestroy @json
EXEC @hr = sp_OADestroy @cert
RETURN
END
PRINT 'The PDF has been successfully cryptographically signed.'
-- The appearance of the signature appears in Adobe Acrobat as shown below.
EXEC @hr = sp_OADestroy @pdf
EXEC @hr = sp_OADestroy @json
EXEC @hr = sp_OADestroy @cert
END
GO
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