(PowerShell) PDF Signature Appearance Width and Height

See more PDF Signatures Examples

Note: This example requires Chilkat v11.0.0 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

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

$pdf = New-Object Chilkat.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 -eq $false) {
    $($pdf.LastErrorText)
    exit
}

# Options for signing are specified in JSON.
$json = New-Object Chilkat.JsonObject

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

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

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

# Add a built-in SVG graphic to the right.
$json.UpdateString("appearance.image","blue-check-mark")
$json.UpdateString("appearance.imagePlacement","right")
$json.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.
$json.UpdateInt("appearance.width",72 * 3)
$json.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".
$json.UpdateInt("appearance.width",72 * 4)
$json.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".
$json.UpdateString("appearance.width","auto")
$json.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.

$jAppearance = New-Object Chilkat.JsonObject
$json.ObjectOf2("appearance",$jAppearance)

$jAppearance.Delete("width")
$jAppearance.Delete("height")
$json.UpdateString("appearance.fontScale","10.0")

# With fontScale = "10.0"


# Load the signing certificate. (Use your own certificate.)
$cert = New-Object Chilkat.Cert
$success = $cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","pfx_password")
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

# Tell the pdf object to use the certificate for signing.
$success = $pdf.SetSigningCert($cert)
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

$success = $pdf.SignPdf($json,"qa_output/hello_signed.pdf")
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

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