(Visual FoxPro) PDF Signature Appearance Text Substitution Keywords

See more PDF Signatures Examples

Note: This example requires Chilkat v9.5.0.85 or greater.

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

LOCAL loPdf
LOCAL lnSuccess
LOCAL loJson
LOCAL loJpgData
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 to be signed.
lnSuccess = loPdf.LoadFile("qa_data/pdf/empty.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

* 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)

* Put the signature on page 1, top left
loJson.UpdateInt("page",1)
loJson.UpdateString("appearance.y","top")
loJson.UpdateString("appearance.x","left")

* Use a font scale of 7.0
loJson.UpdateString("appearance.fontScale","7.0")

* The appearance of the PDF signature can contain any number of text lines.
* Chilkat has defined a number of special keywords that can be used in any text line.
* Each keyword is replaced with the actual value.
* For example, "cert_cn" is replaced with the certificate subject's common name (CN).

* Here we are creating a signature with many lines of text, to demonstrate each
* keyword.
loJson.UpdateString("appearance.text[0]","Date/time in PDF format: current_dt")
loJson.UpdateString("appearance.text[1]","Current Local date/time: current_datetime")
loJson.UpdateString("appearance.text[2]","GMT Timestamp: current_timestamp_gmt")
loJson.UpdateString("appearance.text[3]","Local Timestamp: current_timestamp_local")
loJson.UpdateString("appearance.text[4]","GMT RFC822 date/time: current_rfc822_dt_gmt")
loJson.UpdateString("appearance.text[5]","Local RFC822 date/time: current_rfc822_dt_local")
loJson.UpdateString("appearance.text[6]","Cert DN (Distinguished Name): cert_dn")
loJson.UpdateString("appearance.text[7]","Cert Common Name: cert_cn")
loJson.UpdateString("appearance.text[8]","Cert Organizational ID (2.5.4.97): cert_org_id")
loJson.UpdateString("appearance.text[9]","Cert Email: cert_email")
loJson.UpdateString("appearance.text[10]","Cert Organization: cert_organization")
loJson.UpdateString("appearance.text[11]","Cert Organziational Unit: cert_ou")
loJson.UpdateString("appearance.text[12]","Cert State: cert_state")
loJson.UpdateString("appearance.text[13]","Cert Country: cert_country")
loJson.UpdateString("appearance.text[14]","Cert Locality: cert_locality")
loJson.UpdateString("appearance.text[15]","Cert Serial Number (hex): cert_serial_hex")
loJson.UpdateString("appearance.text[16]","Cert Serial Number (decimal): cert_serial_dec")
loJson.UpdateString("appearance.text[17]","Cert Thumbprint: cert_thumbprint")
loJson.UpdateString("appearance.text[18]","Cert Issuer Common Name: cert_issuer_cn")

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loJpgData = CreateObject('Chilkat.BinData')
lnSuccess = loJpgData.LoadFile("qa_data/jpg/seal1.jpg")
IF (lnSuccess = 0) THEN
    ? "Failed to load the JPG image."
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJpgData
    CANCEL
ENDIF

lnSuccess = loPdf.SetSignatureJpeg(loJpgData)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJpgData
    CANCEL
ENDIF

* Specify that we want to display the JPG image in the center with 33% opacity.
loJson.UpdateString("appearance.image","custom-jpg")
loJson.UpdateString("appearance.imagePlacement","center")
loJson.UpdateString("appearance.imageOpacity","33")

* 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","pfx_password")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJpgData
    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 loJpgData
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loPdf.SignPdf(loJson,"qa_output/hello_signed.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJpgData
    RELEASE loCert
    CANCEL
ENDIF

? "The PDF has been successfully cryptographically signed."

* The appearance of the signature appears in Adobe Acrobat as shown here:



RELEASE loPdf
RELEASE loJson
RELEASE loJpgData
RELEASE loCert