ExportAsImage Null Exception

[Scott Kuhl]

I'm obviously doing something wrong here.  The follow code has no issue getting an image from the GetPage() method but the ExportAsImage() method always throws a null exception:

        public async Task ImportFileAsync(string path)

        {

            var file = await StorageFile.GetFileFromPathAsync(path);

            if (file.FileType == ".pdf")

            {

                    var stream = await file.OpenAsync(FileAccessMode.Read);

                    var fileStream = stream.AsStreamForRead();

                    var pdfViewer = new SfPdfViewerControl();

                    pdfViewer.LoadDocument(fileStream);

                    var image = pdfViewer.GetPage(0);

                    var imageStream = await pdfViewer.ExportAsImage(0) as MemoryStream;

            }

        }

System.NullReferenceException

  HResult=0x80004003

  Message=Object reference not set to an instance of an object.

  Source=Syncfusion.SfPdfViewer.UWP

  StackTrace:

   at Syncfusion.Windows.PdfViewer.PdfDocumentView.<ExportAsImage>d__348.MoveNext()

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Syncfusion.Windows.PdfViewer.SfPdfViewerControl.<ExportAsImage>d__604.MoveNext()

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

What am I doing wrong?

Thanks

[Ashokkumar Viswanathan]

Hi Scott, 

 

Thank you for contacting Syncfusion support, 

 

We were able to reproduce the issue, “Application crashes with null reference exception while exporting PDF pages as images”. Currently, we are validating the issue and we will update the further details on August 31^st 2020. 

 

Regards, 

Ashok Kumar Viswanathan.  

[Ashokkumar Viswanathan]

Hi Scott, 

 

We have confirmed that the issue, “Application crashes with null reference exception while exporting PDF pages as images” is a defect and logged a defect report for this issue.  The patch for this issue will be delivered on September 21^st , 2020. 

 

Please find the feedback link in the below link, 

https://www.syncfusion.com/feedback/17470/application-crashes-with-null-reference-exception-while-exporting-pdf-pages-as 

 

Regards, 

Ashok Kumar Viswanathan. 

[Aribalakrishnan Govindasamy]

Hi Scott, 

       

The issue with “Application crashes with null reference exception while exporting PDF pages as images” has been fixed and the  custom NuGet for the same can be downloaded from the following link      

      

        

Custom NuGet:     

 

 

https://www.syncfusion.com/downloads/support/forum/157313/ze/CustomNuget-927737167.zip 

 

    

Disclaimer:      

Please note that we have created this NuGet for version 18.2.0.56 specifically to resolve the following issue(s) reported in this forum 157313.    

 

      

Note: Kindly follow the steps to clear the NuGet cache and then install patched NuGet to get the issue resolved.      

       

https://www.syncfusion.com/kb/6987/how-to-clear-nuget-cache     

 

          

This fix will be included in our 2020 Volume 3 Sp1 Release which will be available in September 2020.     

   

       

 

Regards,       

 

Aribalakrishnan G.