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B4X

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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Dim success As Boolean = False

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

Dim pdf As ChilkatPdf
pdf.Initialize("pdf")

'  Load a PDF to be signed.
'  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success = pdf.LoadFile("qa_data/pdf/hello.pdf")
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


'  Options for signing are specified in JSON.
Dim json As ChilkatJsonObject
json.Initialize

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

'  Specify the location/position, scale, and content of the signature's appearance.
json.UpdateInt("page", 1)
json.UpdateString("appearance.y", "top")
json.UpdateString("appearance.x", "left")
json.UpdateString("appearance.fontScale", "10.0")
json.UpdateString("appearance.text[0]", "Digitally signed by: cert_cn")
json.UpdateString("appearance.text[1]", "current_dt")
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.
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.
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.
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%
'  (image:https://example-code.com/images/centered_svg.jpg/endImage)

'  Load the signing certificate. (Use your own certificate.)
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx", "secret")
If success = False Then
    Log(cert.LastErrorText)
    Return
End If


'  Tell the pdf object to use the certificate for signing.
success = pdf.SetSigningCert(cert)
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


success = pdf.SignPdf(json, "qa_output/hello_signed.pdf")
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


Log("The PDF has been successfully cryptographically signed.")

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

'  (image:https://example-code.com/images/pdf_signature_green_check_grey_circle.jpg/endImage)

'  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"
json.UpdateString("appearance.image", "green-check-green-circle")
'  We get:
'  (image:https://example-code.com/images/green-check-green-circle.jpg/endImage)

'  "application-approved"
'  (image:https://example-code.com/images/application-approved.jpg/endImage)

'  "application-rejected"
'  (image:https://example-code.com/images/application-rejected.jpg/endImage)

'  "document-accepted"
'  (image:https://example-code.com/images/document-accepted.jpg/endImage)

'  "approved"
'  (image:https://example-code.com/images/approved.jpg/endImage)

'  "blue-check-mark"
'  (image:https://example-code.com/images/blue-check-mark.jpg/endImage)

'  "green-check-mark"
'  (image:https://example-code.com/images/green-check-mark.jpg/endImage)

'  "green-check-grey-circle"
'  (image:https://example-code.com/images/green-check-grey-circle.jpg/endImage)

'  "red-x-red-circle"
'  (image:https://example-code.com/images/red-x-red-circle.jpg/endImage)

'  "rejected"
'  (image:https://example-code.com/images/rejected.jpg/endImage)

'  "result-failure"
'  (image:https://example-code.com/images/result-failure.jpg/endImage)

'  "result-pass"
'  (image:https://example-code.com/images/result-pass.jpg/endImage)

'  "signature"
'  (image:https://example-code.com/images/signature.jpg/endImage)

'  "document-check"
'  (image:https://example-code.com/images/document-check.jpg/endImage)

'  "document-x"
'  (image:https://example-code.com/images/document-x.jpg/endImage)

'  "red-x-grey-circle"
'  (image:https://example-code.com/images/red-x-grey-circle.jpg/endImage)