Marco wrote:
> One question: from an acrofield I can get PdfName.DA to know the Helv type.

Please explain. You get an appearance stream containing the name /Helv.

> When I want to create the basefont I must use the constant "Helvetica" and 
> not "Helv".

In the resources of this stream you can find out that /Helv is a name
referring to a dictionary where one of the key-value pairs is
/BaseFont /Helvetica

> There's a way to transform "Helv" in "Helvetica"? so I can use it to 
> transform 
> every font style.

The name used to refer to a font can be anything.
Sometimes it will be /f1, it could even be /Marco.
If you want the font name, you have to look in the
resources dictionary (/DR).
-- 
This answer is provided by 1T3XT BVBA

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