Print pdf with RadPdfViewer - issue with font

[John]

Hello, 
I'm trying to merge several PDF files into one and then print them.
I am using version 2022.2.621.

My code looks like this

       public static void Print(List<string> files)
       {
           using (MemoryStream stream = new MemoryStream())
           {
               using (PdfStreamWriter fileWriter = new PdfStreamWriter(stream, leaveStreamOpen: true))
               {
                   foreach (string path in files)
                   {
                       using (PdfFileSource fileSource = new PdfFileSource(new MemoryStream(File.ReadAllBytes(path))))
                       {
                           for (int i = 0; i < fileSource.Pages.Length; i++)
                           {
                               PdfPageSource sourcePage = fileSource.Pages[i];
                               using (PdfPageStreamWriter resultPage = fileWriter.BeginPage(sourcePage.Size))
                               {
                                   // set content                      
                                   resultPage.WriteContent(sourcePage);
                               }
                           }
                       }
                   }
               }

               var pdfViewer = new RadPdfViewer();
               PdfFormatProvider provider = new PdfFormatProvider();
               RadFixedDocument document = provider.Import(stream);
               pdfViewer.Document = document;
               var printdlg = new PrintDialog();
               printdlg.UserPageRangeEnabled = true;
               printdlg.SelectedPagesEnabled = true;
               if (printdlg.ShowDialog() == true)
               {
                   var printSettings = new PrintSettings(Path.GetFileNameWithoutExtension("file"), false);
                   pdfViewer.Print(printdlg, printSettings);
               }
           }
       }

My problem is, that befor print pdf looks like this

But after print



What I discoverd, that file befor print has more fonts then after.
Befor:


After



How can I handle this problem?

[John]

What I found out, that build in Helvetica from FontsRepository doesn't support polish characters.
When I replace font with my own it works

                var fontData = File.ReadAllBytes(@"...\helvetica-255\Helvetica.ttf");
                FontsRepository.RegisterFont(new FontFamily("Helvetica"), FontStyles.Normal, FontWeights.Bold, fontData);
                FontsRepository.TryCreateFont(new FontFamily("Helvetica"), FontStyles.Normal, FontWeights.Bold, out var helvetica1);
                //Appy the font to the text fragments in the document
                foreach (RadFixedPage page in xx.Pages)
                {
                    foreach (ContentElementBase contentElement in page.Content)
                    {
                        if (contentElement is Telerik.Windows.Documents.Fixed.Model.Objects.Form form)
                        {
                            foreach (var f in form.FormSource.Content)
                            {
                                if (f is Telerik.Windows.Documents.Fixed.Model.Objects.Form ff)
                                {
                                    foreach (var f1 in ff.FormSource.Content)
                                    {
                                        if (f1 is TextFragment textFragment)
                                        {
                                            if (textFragment.Font.Name == "Helvetica")
                                            {
                                                textFragment.Font = helvetica1;
                                            }
                                            else if (textFragment.Font.Name == "Verdana,Bold")
                                            {
                                                // textFont = verdanaBold;
                                            }
                                        }
                                    }
                                }
                            }
                        }

                    }
                }

[Yoan]

Hello John,

Thank you for the follow-up feedback. Please correct me if I am wrong, but from what I understand, you were able to resolve the issue on your own. It is indeed possible that some fonts might not support certain characters, so switching to other fonts that do provide this support can always serve as a workaround.

Regards,

Yoan