SQL Server
SQL Server
PDF Signature Page Location
See more PDF Signatures Examples
This example demonstrates how to specify the location of a PDF signature on a page.Note: This example requires Chilkat v9.5.0.85 or greater.
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-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
DECLARE @hr int
DECLARE @iTmp0 int
-- Important: Do not use nvarchar(max). See the warning about using nvarchar(max).
DECLARE @sTmp0 nvarchar(4000)
DECLARE @success int
SELECT @success = 0
-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.
DECLARE @pdf int
EXEC @hr = sp_OACreate 'Chilkat.Pdf', @pdf OUT
IF @hr <> 0
BEGIN
PRINT 'Failed to create ActiveX component'
RETURN
END
-- Load a PDF to be signed.
-- The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
EXEC sp_OAMethod @pdf, 'LoadFile', @success OUT, 'qa_data/pdf/hello.pdf'
IF @success = 0
BEGIN
EXEC sp_OAGetProperty @pdf, 'LastErrorText', @sTmp0 OUT
PRINT @sTmp0
EXEC @hr = sp_OADestroy @pdf
RETURN
END
-- Options for signing are specified in JSON.
DECLARE @json int
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
-- When cryptographically signing a PDF, the signature's appearance can be placed on a specific
-- page in the PDF document, and at a specified location on the page.
-- The 1st page of the PDF document is page number 1 (we don't use 0-based numbering for PDF page numbers).
-- The PDF object has a NumPages property, so we can use it to sign on the last page of the PDF.
EXEC sp_OAGetProperty @pdf, 'NumPages', @iTmp0 OUT
EXEC sp_OAMethod @json, 'UpdateInt', @success OUT, 'page', @iTmp0
-- appearance.y and appearance.x JSON properties control the x,y location of the signature.
-- The "appearance.y" can be "top" or "bottom".
-- The "appearance.x" can be "left", "middle", or "right".
-- It is also possible to specify exact PDF location in user space coordinates, which is discussed below.
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.y', 'bottom'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.x', 'middle'
-- In this example, the fontScale (in combination with the number of appearance text lines and the length of the longest text line),
-- automatically determine the width/height of the signature text box. Any included graphic (JPG image or built-in SVG) is automatically
-- scaled to fit. It is alternatively possible to specify the desired width/height of the signature rectangle. In that case
-- you would NOT specify a fontScale because Chilkat would automatically chose a font scale to fit the text to the desired rectangle.
-- This example demonstrates how to specify the exact width/height of the PDF signature text box.
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.fontScale', '9.0'
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.image', 'document-accepted'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imagePlacement', 'left'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imageOpacity', '100'
-- Load the signing certificate. (Use your own certificate.)
DECLARE @cert int
EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT
EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/pfx/myPdfSigningCert.pfx', 'pfx_password'
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/hello_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 here:
-- ----------------------------------------------------------------------------------------------------
-- *** Scroll down for information about specifying the PDF signature x,y location in user space coordinates.
-- ----------------------------------------------------------------------------------------------------
-- (image:https://example-code.com/images/bottom_middle_signature.jpg/endImage)
-- The x,y coordinates of a PDF page are in "user space", called "points", and there are 72 pointes per inch.
-- A PDF page (8.5" x 11") is 612 points wide and 792 points high.
-- The bottom left is at 0,0. The top right is at 612,792.
--
-- To specify the location of a signature rectangle, the "appearance.y" is the y coordinate of the top of the signature rectangle,
-- and the "appearance.x" is the x coordinate of the left of the signature rectangle.
-- Therefore, to position the signature rectangle at the exact top/left of the page, we do this:
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.y', '792'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.x', '0'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[0]', 'Digitally signed again by: cert_cn'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.text[1]', 'current_dt'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.image', 'document-accepted'
EXEC sp_OAMethod @json, 'UpdateString', @success OUT, 'appearance.imagePlacement', 'right'
DECLARE @pdf2 int
EXEC @hr = sp_OACreate 'Chilkat.Pdf', @pdf2 OUT
EXEC sp_OAMethod @pdf2, 'LoadFile', @success OUT, 'qa_output/hello_signed.pdf'
EXEC sp_OAMethod @pdf2, 'SetSigningCert', @success OUT, @cert
EXEC sp_OAMethod @pdf2, 'SignPdf', @success OUT, @json, 'qa_output/hello_signed2.pdf'
IF @success = 0
BEGIN
EXEC sp_OAGetProperty @pdf2, 'LastErrorText', @sTmp0 OUT
PRINT @sTmp0
EXEC @hr = sp_OADestroy @pdf
EXEC @hr = sp_OADestroy @json
EXEC @hr = sp_OADestroy @cert
EXEC @hr = sp_OADestroy @pdf2
RETURN
END
PRINT 'The PDF has been successfully cryptographically signed again.'
-- Here we have the PDF with the signature just added at the exact top/left.
-- (image:https://example-code.com/images/pdf_signature_top_left.jpg/endImage)
EXEC @hr = sp_OADestroy @pdf
EXEC @hr = sp_OADestroy @json
EXEC @hr = sp_OADestroy @cert
EXEC @hr = sp_OADestroy @pdf2
END
GO