[
https://issues.apache.org/jira/browse/PDFBOX-4556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16851533#comment-16851533
]
bal commented on PDFBOX-4556:
-----------------------------
Hi tilman,
can you please guide how the stamping on PDF is achieved using the pdfbox? i
want to show some image or text on the PDF when it is signed. i am using below
code to show the visual representation of the signature.i am reading the the
inputstream returned from the method and set it to
signatureoptions.setVisualSignature to read it. Also attaching the stacktrace
please let me know where i am doing wrong?
getting null pointer exception
stacktrace :
at org.apache.pdfbox.pdfwriter.COSWriter.visitFromStream(COSStream obj)
at org.apache.pdfbox.cos.COSStream.accept(ICOSVisitor visitor)
at org.apache.pdfbox.pdfwriter.COSWriter.doWriteObject(COSBase obj)
at org.apache.pdfbox.pdfwriter.COSWriter.doWriteBody(COSDocument doc)
at org.apache.pdfbox.pdfwriter.COSWriter.visitFromDocument(COSDocument doc)
at org.apache.pdfbox.cos.COSDocument.accept(ICOSVisitor visitor)
at org.apache.pdfbox.pdfwriter.COSWriter.write(PDDocument doc)
at org.apache.pdfbox.pdmodel.PDDocument.save(OutputStream output)
at PdfBox.ResponseDigest.createVisualSignatureTemplate(PDDocument signedDoc,
Int32 stampingPage, String tickImagePath, String name, String location, String
reason, Int32 xCo_ordinates, Int32 yCo_ordinates, Int32 signatureHeight, Int32
signatureWidth) in D:\balasaheb\Esign
2.1Try\PdfBoxTest\PdfBox\PdfBox\ResponseDigest.aspx.cs:line 466
-----------------------------------------------------------------------------------------------------------
SignatureOptions signatureoptions = new SignatureOptions();
signatureoptions.setVisualSignature(createVisualSignatureTemplate(signedDocument,
pageNo, tickImagePath, name, location, reason, xCo_ordinates, yCo_ordinates,
signatureHeight, signatureWidth));
please find the method
private InputStream createVisualSignatureTemplate(PDDocument signedDoc, int
stampingPage, string tickImagePath, string name, string location, string
reason, int xCo_ordinates, int yCo_ordinates, int signatureHeight, int
signatureWidth)
{
java.io.File imageFile = new java.io.File(tickImagePath);
PDPage page =
(PDPage)signedDoc.getDocumentCatalog().getAllPages().get(stampingPage - 1);
float x = (float)xCo_ordinates;
float y = (float)yCo_ordinates;
float sigWidth = (float)signatureWidth;
float sigheight = (float)signatureHeight;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try
{
Rectangle2D humanRectangle = new Rectangle2D.Float(xCo_ordinates,
yCo_ordinates, signatureWidth, signatureHeight);
// create signature rectangle
PDRectangle pdRectangle = null;
if (pdRectangle == null)
{
pdRectangle = createSignatureRectangle(signedDoc, humanRectangle,
stampingPage);
}
PDAcroForm acroForm = new PDAcroForm(signedDoc);
signedDoc.getDocumentCatalog().setAcroForm(acroForm);
signedDoc.getDocumentCatalog().getCOSObject().setNeedToBeUpdate(true);
PDSignatureField signatureField = new PDSignatureField(acroForm);
List<PDField> acroFormFields = new List<PDField>();
acroForm.getCOSObject().setDirect(true);
acroForm.getCOSObject().setNeedToBeUpdate(true);
acroFormFields.Add(signatureField);
signatureField.getCOSObject().setNeedToBeUpdate(true);
PDAnnotationWidget Widget = new PDAnnotationWidget();
//PDAnnotation Widget =
PDAnnotation.createAnnotation(signedDoc.getDocumentCatalog().getCOSObject());
Widget.getCOSObject().setNeedToBeUpdate(true);
Widget.setRectangle(pdRectangle);
Widget.setPage(page);
PDStream pdfstream = new PDStream(signedDoc);
pdfstream.getCOSObject().setNeedToBeUpdate(true);
PDXObjectForm form = new PDXObjectForm(pdfstream);
form.getCOSObject().setNeedToBeUpdate(true);
// set resources to xobj
PDResources resources = new PDResources();
resources.getCOSObject().setNeedToBeUpdate(true);
PDFont font = PDType1Font.HELVETICA;
form.setResources(resources);
form.setFormType(1);
PDRectangle bbox = new PDRectangle(pdRectangle.getWidth(),
pdRectangle.getHeight());
float height = bbox.getHeight();
form.setBBox(pdRectangle);
PDAppearanceDictionary appearanceDictionary = new
PDAppearanceDictionary(signedDoc.getDocumentCatalog().getCOSDictionary());
appearanceDictionary.getCOSObject().setDirect(true);
appearanceDictionary.getCOSObject().setNeedToBeUpdate(true);
PDAppearanceStream appearanceStream = new
PDAppearanceStream(form.getCOSStream());
appearanceStream.getCOSObject().setNeedToBeUpdate(true);
appearanceDictionary.setNormalAppearance(appearanceStream);
Widget.setAppearance(appearanceDictionary);
try
{
PDPageContentStream pagecontentStream = new PDPageContentStream(signedDoc,
page, true, false);
pagecontentStream.setNonStrokingColor(java.awt.Color.black);
pagecontentStream.addRect(x, y, sigWidth, sigheight);
int windingRule = PathIterator.WIND_NON_ZERO;
pagecontentStream.fill(windingRule);
PDXObjectImage imgobj = null;
imgobj = new PDJpeg(signedDoc, new FileInputStream(tickImagePath));
//imgobj = createImageobject(tickImagePath, signedDoc, stampingPage);
// draw xobject with coordinates
pagecontentStream.drawImage(imgobj, x, y);
pagecontentStream.saveGraphicsState();
pagecontentStream.restoreGraphicsState();
float fontSize = 8;
float leading = fontSize * 1.0f;
pagecontentStream.beginText();
if (!string.IsNullOrEmpty(name))
{
pagecontentStream.drawString("signed By:");
pagecontentStream.drawString("Name:" + name);
}
if (!string.IsNullOrEmpty(location))
pagecontentStream.drawString("Location:" + location);
if (!string.IsNullOrEmpty(reason))
pagecontentStream.drawString("Reason:" + reason);
pagecontentStream.endText();
pagecontentStream.close();
}
catch (System.Exception ex)
{
ex.StackTrace.ToString();
using (StreamWriter sw = new StreamWriter(@"D:\balasaheb\Esign 2.1Try\Test" +
"\\" + "Log.txt"))
{
sw.Write(ex.StackTrace.ToString());
sw.Close();
}
}
signedDoc.save(baos);
return new ByteArrayInputStream(baos.toByteArray());
}
> how the visual representation of the signature is achieved
> ------------------------------------------------------------
>
> Key: PDFBOX-4556
> URL: https://issues.apache.org/jira/browse/PDFBOX-4556
> Project: PDFBox
> Issue Type: Wish
> Components: .NET
> Reporter: bal
> Priority: Major
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
