如何创建具有相对文件路径和PDFsharp的PDF文件链接？

Question

My App creates a Content.pdf file that links to Server.pdf and Client.pdf. This is the folder structure:

• ..\\MyApp\\Ressources\\Content.pdf
• ..\\MyApp\\Ressources\\Server\\Server.pdf
• ..\\MyApp\\Ressources\\Client\\Client.pdf

Furthermore, the folders and files get burned on a CD/DVD or get backed up on a network drive - that causes me to use relative file paths. I use following code to create the Content.pdf:

relative WebLink:

var relativeFileLinkPath =  "./" + Directory.GetParent(doc.Uri.LocalPath).Name + "/"+ doc.OutputFileName;
page.AddWebLink(pdfrect, relativeFileLinkPath);

relative FileLink:

var relativeFileLinkPath =  "./" + Directory.GetParent(doc.Uri.LocalPath).Name + "/"+ doc.OutputFileName;
page.AddFileLink(pdfrect, relativeFileLinkPath);

Both work fine on local drive, but my issues are:

• WebLinks do not work/open on network drive
• FileLinks close the Content.pdf and replace it with the linked pdf file

Questions:

How can I modify the FileLinks to get opened in a new (PDF reader) instance/window?

• Holding the CTRL-Key when clicking on the FileLink is an option but not a nice solution.

What's the right syntax for relative PDF web links?

Answer 1

AddFileLink is the correct method for files sitting side by side in a folder.

To control whether a new window will be opened, a small modification of PDFsharp's PdfLinkAnnotation class will be needed. PDF supports a NewWindow attribute which PDFsharp cannot currently set.

Get the source for PDFsharp, locate "<</Type/Action/S/Launch/F<</Type/Filespec/F{0}>> >>" in PdfLinkAnnotation.cs and replace it with "<</Type/Action/S/Launch/NewWindow true/F<</Type/Filespec/F{0}>> >>" .

Disclaimer: I did not test the proposed change - I hope it is syntactically correct and I hope it does what you want.
Disclaimer 2: This change is needed for PDFsharp 1.50 beta 3. Later versions may have support for that flag.