PureBasic
PureBasic
PDF Signatures with Built-in SVG Graphics
See more PDF Signatures Examples
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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IncludeFile "CkCert.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkPdf.pb"
Procedure ChilkatExample()
success.i = 0
; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.
pdf.i = CkPdf::ckCreate()
If pdf.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
; Load a PDF to be signed.
; The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success = CkPdf::ckLoadFile(pdf,"qa_data/pdf/hello.pdf")
If success = 0
Debug CkPdf::ckLastErrorText(pdf)
CkPdf::ckDispose(pdf)
ProcedureReturn
EndIf
; Options for signing are specified in JSON.
json.i = CkJsonObject::ckCreate()
If json.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
; In most cases, the signingCertificateV2 and signingTime attributes are required.
CkJsonObject::ckUpdateInt(json,"signingCertificateV2",1)
CkJsonObject::ckUpdateInt(json,"signingTime",1)
; Specify the location/position, scale, and content of the signature's appearance.
CkJsonObject::ckUpdateInt(json,"page",1)
CkJsonObject::ckUpdateString(json,"appearance.y","top")
CkJsonObject::ckUpdateString(json,"appearance.x","left")
CkJsonObject::ckUpdateString(json,"appearance.fontScale","10.0")
CkJsonObject::ckUpdateString(json,"appearance.text[0]","Digitally signed by: cert_cn")
CkJsonObject::ckUpdateString(json,"appearance.text[1]","current_dt")
CkJsonObject::ckUpdateString(json,"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.
CkJsonObject::ckUpdateString(json,"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.
CkJsonObject::ckUpdateString(json,"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.
CkJsonObject::ckUpdateString(json,"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.)
cert.i = CkCert::ckCreate()
If cert.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
success = CkCert::ckLoadPfxFile(cert,"qa_data/pfx/myPdfSigningCert.pfx","secret")
If success = 0
Debug CkCert::ckLastErrorText(cert)
CkPdf::ckDispose(pdf)
CkJsonObject::ckDispose(json)
CkCert::ckDispose(cert)
ProcedureReturn
EndIf
; Tell the pdf object to use the certificate for signing.
success = CkPdf::ckSetSigningCert(pdf,cert)
If success = 0
Debug CkPdf::ckLastErrorText(pdf)
CkPdf::ckDispose(pdf)
CkJsonObject::ckDispose(json)
CkCert::ckDispose(cert)
ProcedureReturn
EndIf
success = CkPdf::ckSignPdf(pdf,json,"qa_output/hello_signed.pdf")
If success = 0
Debug CkPdf::ckLastErrorText(pdf)
CkPdf::ckDispose(pdf)
CkJsonObject::ckDispose(json)
CkCert::ckDispose(cert)
ProcedureReturn
EndIf
Debug "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"
CkJsonObject::ckUpdateString(json,"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)
CkPdf::ckDispose(pdf)
CkJsonObject::ckDispose(json)
CkCert::ckDispose(cert)
ProcedureReturn
EndProcedure