Hi,
Part of our PDF generation process uses xslt and xml data. We are finding that we have issues when the PDF that this generates contains local links that point to other pages within the document (rather than the same page the link is on).
Using version 11.5.0 this results in an Object reference not set to an instance of an object exception.
Note this all worked fine in versions prior to 11.5.0 (e.g 11.4.0 and 9.4.0 - 9.4.0 was the original version we were using until we decided to upgrade recently).
I have created a small test example that is just a link to some text that is on another page to show the problem. The error occurs during converting the Aspose.Pdf.Generator.Pdf to a Aspose.Pdf.Document.Document and then adding those pages to an in-progress document.
i.e.:
using (var contentDocument = new Document(pdf))
{
outputDocument.Pages.Add(contentDocument.Pages); // Error thrown here
contentPages = contentDocument.Pages.Count;
}The full test code to show this issue is below. If you force the Footnote link and Footnote text to be on the same page (e.g. change it to be in the 1 Section) then there is no error.Note that in our actual code the link and text are all in the same Section and it is just the content that is pushing them to different pages.public void FootnoteErrorExample()
{
var license = new License();
license.SetLicense(“Aspose.Pdf.lic”);<span style="color:blue;">var</span> dummyXml = <span style="color:#a31515;">"<DummyData></DummyData>"</span>; <span style="color:blue;">var</span> xslt = <span style="color:maroon;">@"<?xml version='1.0' encoding='utf-8'?> <xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'> <xsl:template match='/'> <Pdf xmlns='Aspose.Pdf'> <Section> <Text> <Segment LinkType='Local'> <xsl:attribute name='TargetID'> <xsl:text>test-footnote-link</xsl:text> </xsl:attribute> Footnote link </Segment> </Text> </Section> <Section> <Text> <Segment> <xsl:attribute name='Id'> <xsl:text>test-footnote-link</xsl:text> </xsl:attribute> Footnote text </Segment> </Text> </Section> </Pdf> </xsl:template> </xsl:stylesheet>"</span>; <span style="color:blue;">try</span> { <span style="color:blue;">var</span> outputDocument = <span style="color:blue;">new</span> <span style="color:darkblue;">Document</span>(); <span style="color:blue;">var</span> pdf = <span style="color:blue;">new</span> <span style="color:darkblue;">Pdf</span>(); pdf.<span style="color:darkcyan;">BindXML</span>(<span style="color:darkcyan;">GenerateStreamFromString</span>(dummyXml), <span style="color:darkcyan;">GenerateStreamFromString</span>(xslt)); pdf.<span style="color:darkcyan;">Save</span>(<span style="color:maroon;">@"D:\temp\generated.pdf"</span>); <span style="color:blue;">var</span> contentPages = 0; <span style="color:blue;">using</span> (<span style="color:blue;">var</span> contentDocument = <span style="color:blue;">new</span> <span style="color:darkblue;">Document</span>(pdf)) { outputDocument.<span style="color:purple;">Pages</span>.<span style="color:darkcyan;">Add</span>(contentDocument.<span style="color:purple;">Pages</span>); contentPages = contentDocument.<span style="color:purple;">Pages</span>.<span style="color:purple;">Count</span>; } } <span style="color:blue;">catch</span> (<span style="color:darkblue;">Exception</span> e) { <span style="color:darkblue;">Assert</span>.<span style="color:darkcyan;">Fail</span>(e.<span style="color:purple;">Message</span>); }}
private Stream GenerateStreamFromString(string value)
{
var stream = new MemoryStream();
var writer = new StreamWriter(stream);
writer.Write(value);
writer.Flush();
stream.Position = 0;
return stream;
}
ckling: