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When adding text to a page using your code from this post, I get inconsistent results if there are unpaired parentheses in the text. I believe that Pdfium.Net is not escaping the characters correctly in this situation. For example, if I use: Code:
txtObj.TextUnicode = ")";
the resulting pdfPage will render to an image correctly with code like this: Code:
pdfPage.Render(pdfBitmap, 0, 0, pdfBitmap.Width, pdfBitmap.Height, Patagames.Pdf.Enums.PageRotate.Normal, Patagames.Pdf.Enums.RenderFlags.FPDF_ANNOT);
however, saving the same PDF with this code: Code:
pdfDocument.Save(memoryStream, SaveFlags.NoIncremental, 17);
results in an invalid file with unpredictable results. Acrobat might display a corrupted version of the encodedText in place of the parentthesis (e.g. Tj ET BT / 12 Tf 1 0 0 1 383.707 515.5225 Tm 255), or it might simply refuse to open the file at all. On the other hand, if I manually escape all parenthesis before calling EncodeText like this: Code:
pdfTextObject.TextAnsi = pdfTextObject.TextAnsi.Replace("(", @"\(").Replace(")", @"\)");
...then pdfDocument.Save works as expected, but now pdfPage.Render now displays the extra backslash used to escape the parenthesis, and this is true whether the parenthesis are paired or unpaired. I am creating a PDF from scratch using your EncodeTextObject() function, then using pdfPage.Render() to preview the PDF in a web application, and finally pdfDocument.Save() to create a PDF file, but I think these two functions are handling escape characters in either an incorrect or inconsistent way. Edited by user Tuesday, December 26, 2017 11:26:26 AM(UTC)
| Reason: correcting double negative
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Rank: Guest
Groups: Guests
Joined: 1/5/2016(UTC)
Posts: 162
Was thanked: 5 time(s) in 5 post(s)
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One workaround for inconsistent behavior between the PDF and the rendered pages is to save and reload the PdfDocument to and from a MemoryStream - after modifying the PDF, but before rendering the page. Code:MemoryStream memoryStream = new MemoryStream;
PdfPage.Document.Save(memoryStream, saveFlags, 17);
pdfDocument = PdfDocument.Load(memoryStream);
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