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Visual FoxPro

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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LOCAL lnSuccess
LOCAL loPdf
LOCAL loJson
LOCAL loCert

lnSuccess = 0

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

loPdf = CreateObject('Chilkat.Pdf')

* Load a PDF to be signed.
* The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
lnSuccess = loPdf.LoadFile("qa_data/pdf/hello.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

* Options for signing are specified in JSON.
loJson = CreateObject('Chilkat.JsonObject')

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

* Specify the location/position, scale, and content of the signature's appearance.
loJson.UpdateInt("page",1)
loJson.UpdateString("appearance.y","top")
loJson.UpdateString("appearance.x","left")
loJson.UpdateString("appearance.fontScale","10.0")
loJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
loJson.UpdateString("appearance.text[1]","current_dt")
loJson.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.
loJson.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.
loJson.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.
loJson.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.)
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    CANCEL
ENDIF

* Tell the pdf object to use the certificate for signing.
lnSuccess = loPdf.SetSigningCert(loCert)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loPdf.SignPdf(loJson,"qa_output/hello_signed.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loCert
    CANCEL
ENDIF

? "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"
loJson.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)

RELEASE loPdf
RELEASE loJson
RELEASE loCert