Having trouble with PDF.Save(pdfStream)

Aspose.PDF Product Family
1

Hi,

I’m trying to save the PDF to a stream, so that I can pass it in the form of a byte array (using VB.Net).

My code looks like this:

Dim objPDF As Pdf
Dim filestream As StreamReader
Dim xmlDoc As New System.Xml.XmlDocument
Dim pdfStream As IO.Stream
Dim pdfByteArray As Byte()


Try

Dim str_CertTemplatePath As String = Trim(ConfigurationSettings.AppSettings(“str_CertTemplatePath”) & “”)

'Get PDF file
objPDF = New Pdf(Trim(ConfigurationSettings.AppSettings(“str_AsposeLicensePath”) & “”))
filestream = New StreamReader(str_CertTemplatePath)
Dim pdfString As String = filestream.ReadToEnd().ToString()
filestream.Close()
filestream = Nothing

xmlDoc.LoadXml(pdfString)
objPDF.BindXML(xmlDoc, Nothing)
objPDF.Save(pdfStream) ‘Exception is thrown on this line’
pdfStream.Read(pdfByteArray, 0, pdfStream.Length)

Return pdfByteArray

Catch objEx As Exception
lng_StatusCode = -1
str_StatusDesc = objEx.ToString()
Return pdfByteArray
End Try

The exception thrown looks like this:

?objEx
{System.NullReferenceException}
[System.NullReferenceException]: {System.NullReferenceException}
HelpLink: Nothing
InnerException: Nothing
Message: “Object reference not set to an instance of an object.”
Source: “Aspose.Pdf”
StackTrace: " at Aspose.Pdf.Pdf.Save(Stream stream)
at TermShareCert.view.RenderPDF(String str_MemberNum, String int_Share, Int64& lng_StatusCode, String& str_StatusDesc) in c:\inetpub\wwwroot\TermShareCert\view.aspx.vb:line 92"
TargetSite: {System.Reflection.RuntimeMethodInfo}

I know that my XML is valid, because I can save the pdf to a file, but I’m unable to save it to a stream. I tried looking at the documentation here: Document.Save | Aspose.Words for .NET, but when I click on the “public void Save(Stream);” link it takes me here: Document.Save | Aspose.Words for .NET - that being the reference for Pdf.Save Method (String, SaveType, HttpResponse), which is not what I expect to see there.

So basically there’s almost zero help on the Pdf.Save(Stream) method. I noticed that my pdfStream object is Nothing right before I try to call objPDF.Save(pdfStream), but I figured that the Save() method would return the instantiated stream object. But it throws an exception instead.

Any help would be greatly appreciated.

Thanks in advance.

2

Btw, I’m using Aspose.Pdf version 1.5.23.0. I know it’s not the latest, but was there a Save(Stream) method issue that was fixed between 1.5 and 2.0?

I just upgraded to 2.0.4.0 and am still having the same problem. I don’t know, maybe I’m just doing something very stupid - which is quite a possibility. [*-)] So, I’m still looking for help. Thanks.

3

Dear pecos,

Thank you for considering Aspose.

System.IO.Stream is an abstract class. You can save the PDF document to a System.IO.MemoryStream object.

4

Dear Tommy, I have the same problem (I am using memorystream). As I noticed the problem is in the document format. If I am using text only - everything is fine, however if doc. includes a list of items (number list) it raises “index was out of range” error :frowning:

5

forever,

Ah, that did it! See… I knew it was something silly that I was doing.

In case anyone else is interested, I needed to save to a stream to load into a byte array and pass it from a web service behind the firewall to the web page that actually displays the PDF.

And all it took was this:

objPDF.Save(pdfStream)
pdfByteArray = pdfStream.GetBuffer()

Thanks for your help, forever.

6

Dear PolarCat,

Thank you for considering Aspose.

Can you please send me an example that can reproduce this error?