(Xojo Plugin) PDF Signatures with Built-in SVG Graphics

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This example demonstrates the built-in SVG graphics that can be applied to the appearance when signing a PDF.

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

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// 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)

// Specify the location/position, scale, and content of the signature's appearance.
success = json.UpdateInt("page",1)
success = json.UpdateString("appearance.y","top")
success = json.UpdateString("appearance.x","left")
success = json.UpdateString("appearance.fontScale","10.0")
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.")

// In addition to the above, this example adds a built-in SVG graphic to the appearance.
// The built-in SVG graphic is specified by a name, such as "green-check-grey-circle".
// The full list of graphic names and images are shown below.
success = json.UpdateString("appearance.image","green-check-grey-circle")

// The graphic can be placed "left", "center", or "right".
// If "center", then the graphic is displayed behind the text.
success = json.UpdateString("appearance.imagePlacement","left")

// The graphic's opacity can range from 1 to 100.
// Centered graphics look best with less opacity (50 or less).
// In this example, we'll keep the opacity at 100.
success = json.UpdateString("appearance.imageOpacity","100")

// Here's an example of the signature's appearance if we centered the SVG graphic with an opacity of 40%


// 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 here:



// The SVG icon graphics are embedded within the Chilkat library, 
// and were graciously provided by uxwing - Free SVG Icons 
// 
// The uxwing licensing terms are reproduced here and can be verified at uxwing licensing

// Icons from uxwing.com are free (see https://uxwing.com/license/)
// 	- All icons on UXWing free to download, and use personal, commercial projects.
// 	- Attribution and Credit is NOT required, however, any credit will be much appreciated.
// 	- There is no limit to the number of times you can use.
// 	- You may modify the resources according to your requirements.

// The set of SVG names and the corresponding graphics are shown below.
// 
// For example, if we specify "green-check-green-circle"
success = json.UpdateString("appearance.image","green-check-green-circle")
// We get:


// "application-approved"


// "application-rejected"


// "document-accepted"


// "approved"


// "blue-check-mark"


// "green-check-mark"


// "green-check-grey-circle"


// "red-x-red-circle"


// "rejected"


// "result-failure"


// "result-pass"


// "signature"


// "document-check"


// "document-x"


// "red-x-grey-circle"