(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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- 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)
    -- 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 to be signed.
    -- The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    DECLARE @success int
    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
    -- 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

    -- 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
    -- 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', '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.
    -- ----------------------------------------------------------------------------------------------------

    

    -- 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
    -- Use "Chilkat_9_5_0.Pdf" for versions of Chilkat < 10.0.0
    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.
    

    EXEC @hr = sp_OADestroy @pdf
    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @pdf2


END
GO