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(AutoIt) PDF Sign Under Existing SignatureSee more PDF Signatures ExamplesThis example explains how sign a previously-signed PDF and place the signature appearance below the existing signature. Note: This example requires Chilkat v9.5.0.85 or greater.
; This example requires the Chilkat API to have been previously unlocked. ; See Global Unlock Sample for sample code. $oPdf = ObjCreate("Chilkat.Pdf") ; Load a PDF to be signed. Local $bSuccess = $oPdf.LoadFile("qa_data/pdf/sign_testing_4/hello_signed.pdf") If ($bSuccess = False) Then ConsoleWrite($oPdf.LastErrorText & @CRLF) Exit EndIf ; The PDF we'll be signing already has a signature added in Adobe Acrobat DC. ; It looks like this: ; (Notice the Adobe background logo, which is commonly what you'll see when a signature ; is created by Adobe Acrobat. Chilkat (obviously) does not create signatures using the Adobe ; logo because it would be a copyright violation.) ; Options for signing are specified in JSON. $oJson = ObjCreate("Chilkat.JsonObject") ; In most cases, the signingCertificateV2 and signingTime attributes are required. $oJson.UpdateInt("signingCertificateV2",1) $oJson.UpdateInt("signingTime",1) ; To put our new signature underneath the existing signature, we have to specify the page ; where the existing signature is found, and then we can specify "under" for the "appearance.y" $oJson.UpdateInt("page",1) $oJson.UpdateString("appearance.y","under") $oJson.UpdateString("appearance.fontScale","10.0") $oJson.UpdateString("appearance.text[0]","Reason: Agreement Accepted by John") $oJson.UpdateString("appearance.text[1]","Date: current_dt") ; Load the signing certificate. (Use your own certificate.) $oCert = ObjCreate("Chilkat.Cert") $bSuccess = $oCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret") If ($bSuccess = False) Then ConsoleWrite($oCert.LastErrorText & @CRLF) Exit EndIf ; Tell the pdf object to use the certificate for signing. $bSuccess = $oPdf.SetSigningCert($oCert) If ($bSuccess = False) Then ConsoleWrite($oPdf.LastErrorText & @CRLF) Exit EndIf ; Note: When adding an additional signature to a PDF, the existing signatures ; are validated, and this includes validating the certificates previously used to ; create the existing signatures. (A signature typically embeds the signing certs.) ; In some cases, the certificates and/or certs in the chain of authentication for ; existing signatures are not present, and are not available on the current system. ; In this case, you can skip the validation by setting this keyword in UncommonOptions: $oPdf.UncommonOptions = "NO_VERIFY_CERT_SIGNATURES" $bSuccess = $oPdf.SignPdf($oJson,"qa_output/hello_signed.pdf") If ($bSuccess = False) Then ConsoleWrite($oPdf.LastErrorText & @CRLF) Exit EndIf ConsoleWrite("The PDF has been successfully cryptographically signed." & @CRLF) ; Here's a screenshot of the 2nd signature positioned under the 1st in Adobe Acrobat: |
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