DataFlex

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.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPdf
    Variant vJson
    Handle hoJson
    Variant vCert
    Handle hoCert
    String sTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatPdf)) To hoPdf
    If (Not(IsComObjectCreated(hoPdf))) Begin
        Send CreateComObject of hoPdf
    End

    //  Load a PDF to be signed.
    //  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    Get ComLoadFile Of hoPdf "qa_data/pdf/hello.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Options for signing are specified in JSON.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End

    //  In most cases, the signingCertificateV2 and signingTime attributes are required.
    Get ComUpdateInt Of hoJson "signingCertificateV2" 1 To iSuccess
    Get ComUpdateInt Of hoJson "signingTime" 1 To iSuccess

    //  Specify the location/position, scale, and content of the signature's appearance.
    Get ComUpdateInt Of hoJson "page" 1 To iSuccess
    Get ComUpdateString Of hoJson "appearance.y" "top" To iSuccess
    Get ComUpdateString Of hoJson "appearance.x" "left" To iSuccess
    Get ComUpdateString Of hoJson "appearance.fontScale" "10.0" To iSuccess
    Get ComUpdateString Of hoJson "appearance.text[0]" "Digitally signed by: cert_cn" To iSuccess
    Get ComUpdateString Of hoJson "appearance.text[1]" "current_dt" To iSuccess
    Get ComUpdateString Of hoJson "appearance.text[2]" "The crazy brown fox jumps over the lazy dog." To iSuccess

    //  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.
    Get ComUpdateString Of hoJson "appearance.image" "green-check-grey-circle" To iSuccess

    //  The graphic can be placed "left", "center", or "right".
    //  If "center", then the graphic is displayed behind the text.
    Get ComUpdateString Of hoJson "appearance.imagePlacement" "left" To iSuccess

    //  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.
    Get ComUpdateString Of hoJson "appearance.imageOpacity" "100" To iSuccess

    //  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.)
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get ComLoadPfxFile Of hoCert "qa_data/pfx/myPdfSigningCert.pfx" "secret" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Tell the pdf object to use the certificate for signing.
    Get pvComObject of hoCert to vCert
    Get ComSetSigningCert Of hoPdf vCert To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get pvComObject of hoJson to vJson
    Get ComSignPdf Of hoPdf vJson "qa_output/hello_signed.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "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"
    Get ComUpdateString Of hoJson "appearance.image" "green-check-green-circle" To iSuccess
    //  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"
    //  


End_Procedure