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 ImageEn Library for Delphi, C++ and .Net
 ImageEn and IEvolution Support Forum
 PdfViewer Find & GetTextRects
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aleatprog

110 Posts

Posted - Feb 04 2023 :  11:22:46  Show Profile  Reply
Hi

I like to identify a specific text position inside a PDF table in order to extract a value which is in a relative position to the search term.

ImageEnView1.PdfViewer.Find(SearchTerm, False, True, False, False, True) highlights correctly the search term, so I thought to use GetTextRects to get the TextRect information of the search term and add then the relative XY distance of the text to extract. Is that the correct way?

If yes, how can I get the CharIndex from the calculated XY position on the PDF page (not on the screen as for ScrToCharIndex)?

Al

xequte

37553 Posts

Posted - Feb 04 2023 :  21:05:26  Show Profile  Reply
Hi Al

With TIEPdfViewerInteraction.Find() if you set the DoSelect to false, it becomes non-visual.

You can then use FindNext() to get the CharIndex and Count

http://www.imageen.com/help/TIEPdfViewerInteraction.FindNext.html

And GetTextRects() to convert those values into rects:

http://www.imageen.com/help/TIEPdfViewerInteraction.GetTextRects.html

// Get the location of the "Adobe" on the page
var
  wordIdx, wordLen, i: Integer;
  rects : TIERectArray;
begin
  memo1.Lines.Clear();

  // Get the location of the "Adobe" by index and count
  ImageEnView1.PdfViewer.Find( 'Adobe', False, False, False, False );
  ImageEnView1.PdfViewer.FindNext( wordIdx, wordLen, False, False );

  // Convert index and count to rects
  rects := ImageEnView1.PdfViewer.GetTextRects( wordIdx, wordLen );
  if rects = nil then
    memo1.Lines.Add( 'NOT FOUND!' )
  else
  for i := Low( rects ) to High( rects ) do
    memo1.Lines.Add( format( '(%d, %d, %d, %d)', [ rects[i].Left, rects[i].Top, rects[i].Right, rects[i].Bottom ]));
end;


Nigel
Xequte Software
www.imageen.com
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aleatprog

110 Posts

Posted - Feb 08 2023 :  04:52:05  Show Profile  Reply
Hi Nigel,

thank you for reply. I'd tried the above code without success before opening this thread. Meanwhile I solved the ScrToCharIndex coordinates problem by processing the file in background by a temporary TImageEnView object using the following code:

memo1.Clear;
ImageEnView1 := TImageEnView.Create(Self);
try
  ImageEnView1.PdfViewer.Enabled := True;
  ImageEnView1.PdfViewer.LoadFromFile(path);
  s := InputBox('Find', 'search term', '');
  ImageEnView1.PdfViewer.Find(s, False, False, False, False, False);
  while ImageEnView1.PdfViewer.FindNext( wordIdx, wordLen, False, False ) do
    rects := rects + ImageEnView1.PdfViewer.GetTextRects( wordIdx, wordLen );
  for i := Low(rects) to High(rects) do
    begin
      CharIndex := ImageEnView1.PdfViewer.ScrToCharIndex(dstX, rects[i].Top, 2.0, 1.0);
      ImageEnView1.PdfViewer.CharIndexToWord(CharIndex, TextIndex, TextLength);
      memo1.Lines.Add(ImageEnView1.PdfViewer.GetText(CharIndex, TextLength));
    end;
finally
  ImageEnView1.Free;
end;


Comparing the coordinates with their relative page position created an issue:
ImageEnView1.PdfViewer.PageWidth <> ImageEnView1.PdfViewer.CurrentPage.Width

ImageEnView1.PdfViewer.PageWidth returns the correct value.

Al
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xequte

37553 Posts

Posted - Feb 08 2023 :  14:56:50  Show Profile  Reply
Hi Al

Sorry, I missed the most important part of your first message.

I will expose the following methods in the coming update (ready next week probably):

PdfViewer.ScrToPage();
PdfViewer.PageToScr();

PdfViewer.CurrentPage.Width gives a raw PDFium value, so it may not be the same as PdfViewer.PageWidth, e.g. when the DPI has been changed. Generally you should only use PdfViewer.PageWidth.


Nigel
Xequte Software
www.imageen.com
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