I have a piece of code that is attempting to add a text to a text field with
PdfStamper. I need to save the new file over the old one so I use a
MemoryStream. Everything works fine but the PDF is corrupt or the text is
missing.
When I use the following code the PDF is corrupt. It was also very small in
size so I thought that perhaps I should append to the old one instead of
saving it on its own. That didn't work either (the text was missing).
Below, `ret` becomes true (so everything seems OK) but, when saving the
memory stream, things are weird.
public void AddSignerComment(BaseDocumentFile pdf, string
comment)
{
var fileMSer =
IoC.GetInstance<Services.IFileManagementService>();
using (var memStrm = new MemoryStream(70000))
{
// Open the file for read.
using (var rStrm =
fileMSer.GetExistingTempFileStream(pdf, FileMode.Open, FileAccess.Read))
using (var pdfReader = new
PdfReader(rStrm))
{
var pdfStamper = new
PdfStamper(pdfReader, memStrm);
AcroFields fields =
pdfStamper.AcroFields;
var blankSign =
fields.GetBlankSignatureNames();
if (blankSign.Count > 0)
{
var name = blankSign[0];
var indexStr =
name.Substring(SignatureFieldName.Length);
bool ret =
fields.SetField(TextFieldName + indexStr, comment, comment);
}
pdfReader.Close();
//pdfStamper.Close(); // iText
closes the memory stream...!
}
// Overwrite the file for write and save
the mem. stream.
using (var rStrm =
GetExistingTempFileStream(pdf, FileMode.Create, FileAccess.Write)
{
memStrm.Position = 0;
fileMSer.CopyStream(memStrm,
rStrm);
}
}
}
Any ideas on why the output file is small and corrupt?
I've spent a whole day fighting with this one. L
Thanks in advance,
Kostas.
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