(AutoIt) PDF Signature Appearance Width and Height

See more PDF Signatures Examples

This example explains how the width and height of the signature appearance rectangle box is determined.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

$oPdf = ObjCreate("Chilkat.Pdf")

; Load a PDF to be signed.
; The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
Local $bSuccess = $oPdf.LoadFile("qa_data/pdf/hello.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

; Options for signing are specified in JSON.
$oJson = ObjCreate("Chilkat.JsonObject")

; In most cases, the signingCertificateV2 and signingTime attributes are required.
$oJson.UpdateInt("signingCertificateV2",1)
$oJson.UpdateInt("signingTime",1)

; Put the signature on page 1, top left
$oJson.UpdateInt("page",1)
$oJson.UpdateString("appearance.y","top")
$oJson.UpdateString("appearance.x","left")

; Add some text.
$oJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
$oJson.UpdateString("appearance.text[1]","current_dt")

; Add a built-in SVG graphic to the right.
$oJson.UpdateString("appearance.image","blue-check-mark")
$oJson.UpdateString("appearance.imagePlacement","right")
$oJson.UpdateString("appearance.imageOpacity","100")

; There are 4 ways the width and height of the signature rectangle can be specified.
; 1) The width and height (in points) are both explicitly specified.
;    User space coordinates use "points" where 72 points equals 1 inch.
;    For example (3 inches wide and 1 inch high)
;    The fontScale is automatically chose to fit.  In addition, if a graphic (JPG or built-in SVG) is included,
;    it is automatically scaled such that the text + graphic fit together in the specified rectangle.
;    Note: When both height and width are explicitly specified, the resultant signature appearance rectangle
;    will match one of the dimensions, but the other dimension will be equal or smaller.  This is because the text
;    must be proportionally scaled.
$oJson.UpdateInt("appearance.width",72 * 3)
$oJson.UpdateInt("appearance.height",72)

; The signature would have this appearance. In this case, the height is actually less than 1 inch because
; if Chilkat chose a fontScale to fill the height, the resulting text's width would be too long for the desired width. 


; 2) The width is explicitly specified, but we use the keyword "auto" for height.
;    In this case, the fontScale is chosen to achieve the desired width,
;    and the height will be whatever the result of the chosen font scale.
;    In this example, the width is 4 inches, and the height is "auto".
$oJson.UpdateInt("appearance.width",72 * 4)
$oJson.UpdateString("appearance.height","auto")

; The signature would have this appearance: 


; 3) The height is explicitly specified, but we use the keyword "auto" for width.
;    In this case, the fontScale is chosen to achieve the desired height,
;    and the width will be whatever the result of the chosen font scale.
;    In this example, the height is 1 inch (72 points) and the width is "auto".
$oJson.UpdateString("appearance.width","auto")
$oJson.UpdateInt("appearance.height",72)

; The signature would have this appearance.


; 4) Finally, we don't need to specify width/height at all.  Instead, we can choose a fontScale
;    and the dimensions of the PDF signature appearance's rectangle will be the result of using the
;    specified fontScale.

Local $oJAppearance = $oJson.ObjectOf("appearance")
$oJAppearance.Delete("width")
$oJAppearance.Delete("height")

$oJson.UpdateString("appearance.fontScale","10.0")

; With fontScale = "10.0"


; Load the signing certificate. (Use your own certificate.)
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","pfx_password")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Tell the pdf object to use the certificate for signing.
$bSuccess = $oPdf.SetSigningCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oPdf.SignPdf($oJson,"qa_output/hello_signed.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("The PDF has been successfully cryptographically signed." & @CRLF)