CODEWITHSUNDEEP
javapdfbox
karthick
karthick

Reputation: 12176

How to get the position of a field using pdfbox?

I got stuck in one area. I need to identify the positions of the PDAcroForm fields in one pdf. I need to do some processing with the x and y value of the fields.

Any idea how to do this? Is the information present in the COS object?

Upvotes: 8

Views: 11192

Answers (4)

Nuwantha Fernando
Nuwantha Fernando

Reputation: 70

Use below code for the latest PdfBox dependency releases

private PDRectangle getFieldArea(PDField field) {
    COSDictionary fieldDict = field.getCOSObject();
    COSArray fieldAreaArray = (COSArray) fieldDict.getDictionaryObject(COSName.RECT);
    PDRectangle rectangle = new PDRectangle(fieldAreaArray);
    System.out.println(rectangle);
    return rectangle;
}

Upvotes: 1

peak
peak

Reputation: 181

The accepted answer does not work anymore. I have tried the approach and received NullPointerException for some elements. In PDFBOX 2.x, you can obtain the rectangle without querying the COS object tree directly.

The information about the field position is stored in PDAnnotationWidget. There can be more widgets associated with the field. To obtain the first one (without checking whether these is one).

PDRectangle rectangle = field.getWidgets().get(0).getRectangle();

To obtain all rectangles (in cases there can be more):

List<PDRectangle> rectangles = field.getWidgets().stream().map(PDAnnotation::getRectangle).collect(Collectors.toList());

Upvotes: 8

Lukas
Lukas

Reputation: 1167

I had the same problem today. The following code works in my case:

private PDRectangle getFieldArea(PDField field) {
  COSDictionary fieldDict = field.getDictionary();
  COSArray fieldAreaArray = (COSArray) fieldDict.getDictionaryObject(COSName.RECT);

  float left = (float) ((COSFloat) fieldAreaArray.get(0)).doubleValue();
  float bottom = (float) ((COSFloat) fieldAreaArray.get(1)).doubleValue();
  float right = (float) ((COSFloat) fieldAreaArray.get(2)).doubleValue();
  float top = (float) ((COSFloat) fieldAreaArray.get(3)).doubleValue();

  return new PDRectangle(new BoundingBox(left, bottom, right, top));
}

Edit: karthicks code is shorter. So I use this code now:

private PDRectangle getFieldArea(PDField field) {
  COSDictionary fieldDict = field.getDictionary();
  COSArray fieldAreaArray = (COSArray) fieldDict.getDictionaryObject(COSName.RECT);
  PDRectangle result = new PDRectangle(fieldAreaArray);
  return result;
}

And you can use this code if you want to test that the returned rectangle is correct:

private void printRect(final PDPageContentStream contentStream, final PDRectangle rect) throws IOException {
  contentStream.setStrokingColor(Color.YELLOW);
  contentStream.drawLine(rect.getLowerLeftX(), rect.getLowerLeftY(), rect.getLowerLeftX(), rect.getUpperRightY()); // left
  contentStream.drawLine(rect.getLowerLeftX(), rect.getUpperRightY(), rect.getUpperRightX(), rect.getUpperRightY()); // top
  contentStream.drawLine(rect.getUpperRightX(), rect.getLowerLeftY(), rect.getUpperRightX(), rect.getUpperRightY()); // right
  contentStream.drawLine(rect.getLowerLeftX(), rect.getLowerLeftY(), rect.getUpperRightX(), rect.getLowerLeftY()); // bottom
  contentStream.setStrokingColor(Color.BLACK);
}

Upvotes: 13

karthick
karthick

Reputation: 12176

I am able to get the details like this

   COSDictionary trailer = document.getDocument().getTrailer();
   COSDictionary root = (COSDictionary) trailer.getDictionaryObject(COSName.ROOT);
   COSDictionary acroForm = (COSDictionary) root.getDictionaryObject(COSName.getPDFName("AcroForm"));
   if (null != acroForm) {
    COSArray fields1 = (COSArray) acroForm.getDictionaryObject(COSName.getPDFName("Fields"));
    for (int l = 0; l < fields1.size(); l++) {
     COSDictionary field = (COSDictionary) fields1.getObject(l);
     COSArray rectArray= (COSArray)field.getDictionaryObject("Rect");
     PDRectangle mediaBox = new PDRectangle( rectArray ); 
System.out.println("mediaBox: " + mediaBox.getLowerLeftX()  +"||" +mediaBox.getLowerLeftY());
System.out.println("mediaBox: " + mediaBox.getUpperRightX()  +"||" + mediaBox.getUpperRightY());

Upvotes: 2

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