(VB.NET) PDF List Unsigned Signature Fields

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Demonstrates how to list the unsigned signature fields in a PDF.

Note: This example requires Chilkat v9.5.0.90 or greater.

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

Dim pdf As New Chilkat.Pdf

' Load a PDF containing 2 remaining unsigned signature fields:
Dim success As Boolean = pdf.LoadFile("qa_data/pdf/doctor_patient_parent.pdf")
If (success = False) Then
    Debug.WriteLine(pdf.LastErrorText)
    Exit Sub
End If


' Note: This example requires Chilkat v9.5.0.90 or greater.
Dim json As New Chilkat.JsonObject
pdf.GetUnsignedSigFields(json)

json.EmitCompact = False
Debug.WriteLine(json.Emit())

' Result:
' {
'   "unsignedSigField": [
'     "doctor_signature",
'     "parent_signature"
'   ]
' }

' To iterate over the field names:
Dim strVal As String

Dim i As Integer = 0
Dim count_i As Integer = json.SizeOfArray("unsignedSigField")
While i < count_i
    json.I = i
    strVal = json.StringOf("unsignedSigField[i]")
    Debug.WriteLine(strVal)
    i = i + 1
End While