> But, PDBookmarkGetTile return Ascii characters which shows some symbols ( by?)
Yes. Don't use that API, it cannot help you;
> After host encoding only, I can see the title how it is in PDF document.
I don't understand what you mean, sorry.
> Do you want me to convert the title ( by? or char* ) to Unicode to get special characters.
No, it needs to remain Unicode at all times. You cannot use PDBookmarkGetTitle.
> After converting, I want to add the special characters to the title and set the bookmark.
No problem, stay in Unicode.
>And also PDBookmarkSetTitle takes the parameter as char *.
Do not use this API either. It is unsuitable.
>Can I set the bookmark title with special characters.
Yes. But work in only Unicode APIs (including ASText).