Programmatically adding JavaScripts to existent PDF files?

Technical Support Apryse SDK
1

Hello:

I searched in the PDFNetC help and there is only one mention of the term
"JavaScript".
I assume that JavaScripts are added to PDF files at the COS SDF/level,
correct?

Can anyone please provide an example?

TIA,

-RFH

2

In PDF format, JavaScript is usually added as part of JavaScript
Action objects (see “JavaScript Actions” on page 709 in PDF Reference
Manual rev 1.7).

Using PDFNet you can create a JavaScript Action as follows:

// In C# (JAVA, C++, VB.NET is similar...)
Obj act_dict = doc.CreateIndirectDict();
act_dict.PutName("S", "JavaScript");
act_dict.PutString("JS", "alert(' Hello World! ');");
Action action = new Action(act_dict);

The action can be assigned to a bookmark:

bookmark.SetAction(action);

or with a link annotation:

link.SetLinkAction(action);

or with a 'document' specific event (see See Table 8.47 in PDF
Reference):

// Add Document Close Action
Obj root = pdfdoc.GetRoot();
Obj aa = root.PutDict("AA");
aa.Put("DC", act_dict);

and so forth ...

3

I would like to extract a TIFF file from a PDF document. The next step will
be to use some OCR software to scrutinize the TIFF file internals. The catch
is that I do no want to save the TIFF file in the filesystem. I prefer
to pass a handle
or pointer provided by SDKNet to the TIFF processing function.

In short: what I need is the TIFF file in RAM, and a pointer to it.

How can I accomplish that?

TIA,

-RFH

4

Hello Ramon,

You can use image.ExportAsTiff() method that accepts FilterWriter. For
example,

// using C#
MemoryFilter mem = new MemoryFilter(8192, false);
FilterWriter writer = FilterWriter(mem);

image.ExportAsTiff(writer);
writer.FlushAll();

mem.GetBuffer();
int tiff_gif_sz = mem.Count();

// C# / JAVA / VB.NET implementation should be along the same lines:

MemoryFilter mem = new MemoryFilter(8192, false);
FilterWriter writer = new FilterWriter(mem);

image.ExportAsTiff(writer);
writer.FlushAll();

mem.GetBuffer();
mem.Count();
------
On May 29, 1:12 pm, Ramon F Herrera <ra...@forcewise.com> wrote:

I would like to extract a TIFF file from a PDF document. The next step will
be to use some OCR software to scrutinize the TIFF file internals. The catch
is that I do no want to save the TIFF file in the filesystem. I prefer
to pass a handle
or pointer provided by SDKNet to the TIFF processing function.

In short: what I need is the TIFF file in RAM, and a pointer to it.

How can I accomplish that?

TIA,

-RFH

5

Great! That seems like a really good solution. I am going to
try it right now.

Thanks so much.

-Ramon

Support wrote:

6

I believe there are some errors in the attached explanation that you
folks kindly sent me.

- The upper snippet uses the variable 'doc', while the lower snippet
uses 'pdfdoc'
   This can be unnecessarily confusing to some users.

- The JavaScript statement alert() should be app.alert()

Thanks and keep up the good work!

-Ramon F Herrera