Hello, I'm trying to digitally sign a PDF file using THIS project as an example.
When it executes st.Close(); I am getting the infamous "Object reference not set to instance of an object".
I have no idea of why this is happening, st is an instance of an object and it is used above. This exception is happening inside .Close() and as I do not have the source code i can only try to guess why...
All i can say is that:
- The original PDF is being successfully read.
- An empty pdf is being generated (I guess the .Close() will write the file).
- My certificate is being loaded, but I am not sure it's the right way to do it.
Here is How I'm loading the certificate:
private void processCert(X509Certificate2 card)
{
X509CertificateParser cp = new org.bouncycastle.x509.X509CertificateParser(card.RawData);
chain = new org.bouncycastle.x509.X509Certificate[] { cp.ReadCertificate() };
}
This is how I am trying to sign the PDF.
public string Sign(string SigReason, string SigContact, string SigLocation, bool visible)
{
string bugLog ="";
try
{
PdfReader reader = new PdfReader(this.inputPDF);
//Activate MultiSignatures
PdfStamper st = PdfStamper.CreateSignature(reader, new FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0', null, true);
FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0');
st.MoreInfo = this.metadata.getMetaData();
st.XmpMetadata = this.metadata.getStreamedMetaData();
PdfSignatureAppearance sap = st.SignatureAppearance;
sap.SetCrypto(this.myCert.Akp, this.myCert.Chain, null, PdfSignatureAppearance.WINCER_SIGNED);
sap.Reason = SigReason;
sap.Contact = SigContact;
sap.Location = SigLocation;
if (visible)
sap.SetVisibleSignature(new iTextSharp.text.Rectangle(100, 100, 250, 150), 1, null);
st.Close();
}
catch (Exception e)
{
bugLog += " ERROR Sign: " + e.Message;
}
return buglog;
}
Has anyone got a though on why I am getting this exception, or what should i do to overcome this?
The iTextSharp Documentation has not been much help...