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(Lianja) 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.
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
loPdf = createobject("CkPdf")
// Load a PDF containing an unsigned signature field.
llSuccess = loPdf.LoadFile("qa_data/pdf/unsigned_sig_field/due_diligence.pdf")
if (llSuccess = .F.) then
? loPdf.LastErrorText
release loPdf
return
endif
// 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.
loJson = createobject("CkJsonObject")
// In most cases, the signingCertificateV2 and signingTime attributes are required.
loJson.UpdateInt("signingCertificateV2",1)
loJson.UpdateInt("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.
loJson.UpdateBool("appearance.fillUnsignedSignatureField",.T.)
// 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
loJson.UpdateString("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.
loJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
loJson.UpdateString("appearance.text[1]","current_dt")
loJson.UpdateString("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).
loJson.UpdateString("appearance.image","green-check-grey-circle")
loJson.UpdateString("appearance.imagePlacement","left")
// Load the signing certificate. (Use your own certificate.)
loCert = createobject("CkCert")
llSuccess = loCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret")
if (llSuccess = .F.) then
? loCert.LastErrorText
release loPdf
release loJson
release loCert
return
endif
// Tell the pdf object to use the certificate for signing.
llSuccess = loPdf.SetSigningCert(loCert)
if (llSuccess = .F.) then
? loPdf.LastErrorText
release loPdf
release loJson
release loCert
return
endif
llSuccess = loPdf.SignPdf(loJson,"qa_output/due_diligence_signed.pdf")
if (llSuccess = .F.) then
? loPdf.LastErrorText
release loPdf
release loJson
release loCert
return
endif
? "The PDF has been successfully cryptographically signed."
// The appearance of the signature appears in Adobe Acrobat as shown below.
release loPdf
release loJson
release loCert
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