You can use the latest version of Aspose.Slides for .NET, that is 4.0.1 and use the following code to export pptx to pdf.
PresentationEx pres = new PresentationEx("tst1.pptx");
I am trying to use the technique in this thread as:
Dim sFile As String
Dim oTemplate As PresentationEx
oTemplate = New PresentationEx(file://rtselp-fs01/Final%20Art/PATRIOT/LessonTemplates/MIRTemplate.pptx)
sFile = Request.MapPath("~\Documents\export_example.pdf")
Neither oTemplate nor sFile are nothing, yet I get the error "Object reference not set to an instance of an object." when the Save line executes. I'm using .net Slides version 4.2.
Can't figure what is wrong; any clues? (MIRTemplate.pptx attached).
I have tried to work with the presentation file shared by you and have successfully been able to generate the PDF using Aspose.Slides for .NET 4.3.0. For your kind reference, I have shared the generated PDF as well. I have used the following code snippet to generate the PDF.
Dim TestPres As PresentationEx = New PresentationEx("D:\\Aspose Data\\MIRTemplate.pptx")
Dim sFile As String = "D:\\Aspose Data\\thumbnail\\Pres.pdf"
Thanks and Regards,