Printing Password protected file

[Andrea De Luca]

Hi, I can open a password protected file, but when i try to print it the file cannot be printed, Even if the file is visible it cannot be printed. Ask the password again.

Any Solution?

Thanks a lot

[Bharathi Selvam]

Hi Andrea De Luca,

Thank you for contacting us.

To investigate the issue, where a password‑protected PDF opens correctly but cannot be printed and prompts for the password again, could you please provide us with a few additional details?

• Which Syncfusion PDF Viewer platform are you using?
• Product version of the PDF Viewer control you are currently using?
• A simple replication sample (if possible) that demonstrates the issue.
• Any specific steps you follow before the issue appears.

These details will help us analyze the scenario accurately and provide the appropriate solution.

We look forward to your response.

Regards,

Bharathi S

[Andrea De Luca]

Hi, the plartform is WinUI. the version of pdf viewer is 32.2462.3.0.

The code:

 Private Function PrintPDF(ByVal FilePDF As String, Optional PassDoc As String = "") As Integer

     Dim dialog As New PrintDialog(), docPdf As New PdfDocumentView(), NumPagine As Integer

     Using docPdf

         With dialog
             Try
                 Dim a As New PdfLoadedDocument(FilePDF, PassDoc)

                 If a.Security.UserPassword = String.Empty Then

                     docPdf.Load(FilePDF, PassDoc)
                 Else
                     Dim PswDoc As String = InputBox("Type the Password to print the document", "")
                     If PswDoc.Length > 0 Then
                         StampaPDF(FilePDF, PswDoc)
                     Else
                         docPdf = Nothing
                     End If
                 End If
             Catch ex As Exception 'Syncfusion.Pdf.PdfDocumentException

                 Dim PswDoc As String = InputBox("Type the Password to print the document","")

                 If PswDoc.Length > 0 Then                     

PrintPDF(FilePDF, PswDoc)

                 Else
                     docPdf = Nothing
                 End If

             End Try
             If docPdf IsNot Nothing Then
                 .Document = docPdf.PrintDocument
                 .Document.DocumentName = Path.GetFileName(FilePDF)
                 .PrinterSettings.Collate = True
                 docPdf.PrinterSettings.PageSize = PdfViewerPrintSize.Fit
                 If ImpostazioniStampa Is Nothing Then
                     .PrinterSettings.Duplex = Duplex.Simplex
                     If ChkStampaFR.Checked Then
                         .PrinterSettings.Duplex = Duplex.Horizontal
                         If RBtnLatoLungo.Checked Then
                             .PrinterSettings.Duplex = Duplex.Vertical
                         End If
                         docPdf.PrinterSettings.Copies = NumUD_NumCopie.Value
                     Else
                         .PrinterSettings = ImpostazioniStampa
                     End If
                     If RbtnIntervallo.Checked Then
                         .PrinterSettings.FromPage = NudPagineDa.Value
                         .PrinterSettings.ToPage = NudPagineA.Value
                     ElseIf RbtnPaginaCorrente.Checked Then

                         If TabControl1.Visible Then
                             Dim PDF_Viewer As PdfViewerControl = TabControl1.SelectedTab.Controls(0)
                             .PrinterSettings.FromPage = PDF_Viewer.CurrentPageIndex
                             .PrinterSettings.ToPage = PDF_Viewer.CurrentPageIndex
                         Else
                             .PrinterSettings.FromPage = PdfViewerControl1.CurrentPageIndex
                             .PrinterSettings.ToPage = PdfViewerControl1.CurrentPageIndex
                         End If
                     End If
                     docPdf.PrinterSettings.Copies = NumUD_NumCopie.Value
                 Else
                     .PrinterSettings = ImpostazioniStampa
                 End If
                 '  .PrinterSettings.Collate = True
                 docPdf.Print(StatLblNomeStampante.Text)
                 NumPagine = docPdf.PageCount * NumUD_NumCopie.Value
                 docPdf.Unload()
             End If
         End With
         dialog.Dispose()
     End Using
     Return NumPagine
 End Function

 

[Bharathi Selvam]

Hi Andrea,

Thank you for sharing the additional details and the code snippet.

We would like to clarify that Syncfusion does not provide a direct PDF Viewer control for the WinUI platform. The PDF Viewer can be used in a WinUI application only by embedding the .NET MAUI PDF Viewer into a native WinUI application, as described in the following KB article:
Integrate .NET MAUI PDF Viewer in native WinUI app | Syncfusion

The APIs used in your shared code snippet (such as Load, Unload, CurrentPageIndex, PrinterSettings, and related printing APIs) are not available in the .NET MAUI PDF Viewer.

Additionally, the version you mentioned (32.2462.3.0) is not available on NuGet.org for the .NET MAUI PDF Viewer. Could you please confirm:

• Whether you are using the .NET MAUI PDF Viewer embedded in a native WinUI application as per the above KB article, and
• In which platform NuGet the mentioned version (32.2462.3.0) available.

This information will help us accurately understand your implementation and guide you with the appropriate approach for your platform.

We appreciate your clarification and look forward to assisting you further.

Regards,
Bharathi S

[Andrea De Luca]

Yes, it was my mistake. It' s a Windows forms application.

[Yamini Sri Muthunagarajan]

Hi Andrea De Luca,

We were unable to reproduce the reported issues with the information provided. For your reference, we've attached a sample we used to attempt to replicate the issue. If you continue to experience the problem, please modify the sample as needed and share it with us. This will help us conduct a more thorough investigation.

Regards,

Yaminisri M

Attachment: Password_issue_vb_(2)_65ebde54.zip

[Arham Asif]

Printing a password-protected file requires first unlocking it by entering the correct password, since most printers and applications cannot process encrypted or restricted documents directly; once the password is entered, the file can be opened, previewed, and printed like any regular document, while ensuring that sensitive information remains secure, and for more guidance you can always visit site.

[Andrea De Luca]

Wonderful!

It Works, it was easier then I thought.

Thank You very much indeed

[Lingeshwaran Sankar]

Hi Arham Asif,
The password prompt appears only when opening an encrypted document, not when printing it. This is the default behavior of the WinForms PDF Viewer. The same behavior can be observed in both Adobe Acrobat Reader and the Microsoft Edge browser.

If you want to enforce password authentication during printing, this can be achieved by adding a custom button that prompts for a password and then implements the printing functionality using the Print() API. We have attached the UG link for your reference.
Printing PDF in WinForms PDF Viewer | Syncfusion®

 

Regards,

Lingeshwaran S

[Andrea De Luca]

Yes, i Know, but in my SW I print the PDFs from a list and not directly from a PDFViewer control.
With one click a print more the one file at the same time.

[Andrea De Luca]

At the end my code is this:

Private Function StampaPDF(ByVal FilePDF As String, Optional PassPdf As String = "") As Integer

    Dim dialog As New PrintDialog(), docPdf As New PdfDocumentView(), NumPagine As Integer

    Dim ProtectedPDF As Boolean = False

    If PassPdf.Length = 0 Then

            If Path.Combine(PdfViewerControl1.DocumentInformation.FilePath, PdfViewerControl1.DocumentInformation.FileName) = FilePDF Then

                PdfViewerControl1.LoadedDocument.Security.UserPassword = String.Empty

                docPdf.Load(PdfViewerControl1.LoadedDocument)

            End If

        If docPdf IsNot Nothing Then

            Try

                docPdf.Load(FilePDF)

            Catch ex As Syncfusion.Pdf.PdfInvalidPasswordException

             ProtectedPDF = True

            End Try

        End If

    Else

        Try

            Dim loadedDoc As New PdfLoadedDocument(FilePDF, PassPdf)

            loadedDoc.Security.UserPassword = String.Empty

            docPdf.Load(FilePDF, PassPdf)

        Catch ex As Syncfusion.Pdf.PdfInvalidPasswordException

            MsgBox("The password for the file " & Path.GetFileName(FilePDF) & " is wrong", MsgBoxStyle.Critical Or MsgBoxStyle.OkOnly, "Stampa PDF")

            docPdf = Nothing

        End Try

    End If

    If DocProtetto Then

        Dim Password As String = InputBox("The file " & Path.GetFileName(FilePDF) & " is password protected" & Environment.NewLine &

                                                  "Type the password")

        If Password <> String.Empty Then

            StampaPDF(FilePDF, Password)

        Else

            docPdf = Nothing

        End If

    End If

        If docPdf IsNot Nothing Then

'Print the document

end if

End Function

[Lingeshwaran Sankar]

Hi Andrea De Luca,

After reviewing the code, we recommend loading the PDF document as a stream instead of directly loading the PdfLoadedDocument from the PDF Viewer. Loading the PdfLoadedDocument directly from the viewer is not a recommended or best practice.

Additionally, to print the document, please make sure to use the Print() API. Using the appropriate printing API will ensure the document is printed correctly.

 

Regards,

Lingeshwaran S