PowerBuilder

PDF Signature with Background Image (Seal/Stamp/etc.)

See more PDF Signatures Examples

Demonstrates how to sign a PDF with an appearance that includes a background image, such as a seal, stamp, etc.

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

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Pdf
oleobject loo_Json
oleobject loo_JpgData
oleobject loo_Cert

li_Success = 0

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loo_Pdf = create oleobject
li_rc = loo_Pdf.ConnectToNewObject("Chilkat.Pdf")
if li_rc < 0 then
    destroy loo_Pdf
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Load a PDF to be signed.
// The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
li_Success = loo_Pdf.LoadFile("qa_data/pdf/hello.pdf")
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    return
end if

// Options for signing are specified in JSON.
loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

// In most cases, the signingCertificateV2 and signingTime attributes are required.
loo_Json.UpdateInt("signingCertificateV2",1)
loo_Json.UpdateInt("signingTime",1)

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

// Use a font scale of 10.0
loo_Json.UpdateString("appearance.fontScale","10.0")

// 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.
loo_Json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
loo_Json.UpdateString("appearance.text[1]","current_dt")
loo_Json.UpdateString("appearance.text[2]","The crazy brown fox jumps over the lazy dog.")

// Load a JPG image to be shown with 30% opacity in the background.
// (the image must be in the JPG format)
// The sample university.jpb is available at https://example-code.com/images/university.jpg

loo_JpgData = create oleobject
li_rc = loo_JpgData.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_JpgData.LoadFile("qa_data/jpg/university.jpg")
if li_Success = 0 then
    Write-Debug "Failed to load the JPG image."
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_JpgData
    return
end if

li_Success = loo_Pdf.SetSignatureJpeg(loo_JpgData)
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_JpgData
    return
end if

// Specify that we want to display the JPG image in the center with 30% opacity.
loo_Json.UpdateString("appearance.image","custom-jpg")
loo_Json.UpdateString("appearance.imagePlacement","center")
loo_Json.UpdateString("appearance.imageOpacity","30")

// Load the signing certificate. (Use your own certificate.)
loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret")
if li_Success = 0 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_JpgData
    destroy loo_Cert
    return
end if

// Tell the pdf object to use the certificate for signing.
li_Success = loo_Pdf.SetSigningCert(loo_Cert)
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_JpgData
    destroy loo_Cert
    return
end if

li_Success = loo_Pdf.SignPdf(loo_Json,"qa_output/hello_signed.pdf")
if li_Success = 0 then
    Write-Debug loo_Pdf.LastErrorText
    destroy loo_Pdf
    destroy loo_Json
    destroy loo_JpgData
    destroy loo_Cert
    return
end if

Write-Debug "The PDF has been successfully cryptographically signed."

// The appearance of the signature appears in Adobe Acrobat as shown below.
// The JPG is automatically scaled to the size of the signature based on the signature's font scale
// and number of text lines.
// (image:https://example-code.com/images/signature2.jpg/endImage)


destroy loo_Pdf
destroy loo_Json
destroy loo_JpgData
destroy loo_Cert