AcroPDF print in reverse order

[haidomingo]

Hi,
I use AcroPDF.dll : AcroPDF.printAll;
Now I want to print in reverse order.
I could use the function AcroPDF.printPages (LastPage, FirstPage).
How can I get the total number of pages in the PDF document? (lastPage?).
I found with google this dll
This Counts the total number of pages of pdf file.
Unfortunately the call to the DLL returns always -1.
The code of dll is: Titel der Webseite
The code is not compatible with Delphi 2010.
Is there another way to print in reverse order?

Thanks.