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(Xojo Plugin) PDF Signature with Background Image (Seal/Stamp/etc.)See more PDF Signatures ExamplesDemonstrates 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.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Dim pdf As New Chilkat.Pdf // Load a PDF to be signed. // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf Dim success As Boolean success = pdf.LoadFile("qa_data/pdf/hello.pdf") If (success = False) Then System.DebugLog(pdf.LastErrorText) Return End If // Options for signing are specified in JSON. Dim json As New Chilkat.JsonObject // In most cases, the signingCertificateV2 and signingTime attributes are required. success = json.UpdateInt("signingCertificateV2",1) success = json.UpdateInt("signingTime",1) // Put the signature on page 1, top left success = json.UpdateInt("page",1) success = json.UpdateString("appearance.y","top") success = json.UpdateString("appearance.x","left") // Use a font scale of 10.0 success = 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. success = json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn") success = json.UpdateString("appearance.text[1]","current_dt") success = 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 Dim jpgData As New Chilkat.BinData success = jpgData.LoadFile("qa_data/jpg/university.jpg") If (success = False) Then System.DebugLog("Failed to load the JPG image.") Return End If success = pdf.SetSignatureJpeg(jpgData) If (success = False) Then System.DebugLog(pdf.LastErrorText) Return End If // Specify that we want to display the JPG image in the center with 30% opacity. success = json.UpdateString("appearance.image","custom-jpg") success = json.UpdateString("appearance.imagePlacement","center") success = json.UpdateString("appearance.imageOpacity","30") // Load the signing certificate. (Use your own certificate.) Dim cert As New Chilkat.Cert success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret") If (success = False) Then System.DebugLog(cert.LastErrorText) Return End If // Tell the pdf object to use the certificate for signing. success = pdf.SetSigningCert(cert) If (success = False) Then System.DebugLog(pdf.LastErrorText) Return End If success = pdf.SignPdf(json,"qa_output/hello_signed.pdf") If (success = False) Then System.DebugLog(pdf.LastErrorText) Return End If System.DebugLog("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. |
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