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(Visual FoxPro) 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.
LOCAL loPdf
LOCAL lnSuccess
LOCAL loJson
LOCAL loCert
* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Pdf')
loPdf = CreateObject('Chilkat.Pdf')
* Load a PDF containing an unsigned signature field.
lnSuccess = loPdf.LoadFile("qa_data/pdf/unsigned_sig_field/due_diligence.pdf")
IF (lnSuccess = 0) THEN
? loPdf.LastErrorText
RELEASE loPdf
CANCEL
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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
* 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",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
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.)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret")
IF (lnSuccess = 0) THEN
? loCert.LastErrorText
RELEASE loPdf
RELEASE loJson
RELEASE loCert
CANCEL
ENDIF
* Tell the pdf object to use the certificate for signing.
lnSuccess = loPdf.SetSigningCert(loCert)
IF (lnSuccess = 0) THEN
? loPdf.LastErrorText
RELEASE loPdf
RELEASE loJson
RELEASE loCert
CANCEL
ENDIF
lnSuccess = loPdf.SignPdf(loJson,"qa_output/due_diligence_signed.pdf")
IF (lnSuccess = 0) THEN
? loPdf.LastErrorText
RELEASE loPdf
RELEASE loJson
RELEASE loCert
CANCEL
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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