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"jr" <cre### [at] gmail com> wrote:
> hi,
>
> "And" <49341109@ntnu.edu.tw> wrote:
> > How to check... a defined identifier string?
> > or number?
>
> not sure if you're using Linux, or have access to. if so, have a look perhaps
> at WFP's 'povr' branch. eg
> <http://news.povray.org/60abd77d%241%40news.povray.org>.
>
>
> regards, jr.
No, I don't use Linux. I'm writing a macro, it input a file_name string. If
(file_name = ""), it will not output that file.
I just found a method using concat(file_name) to avoid inputting non-string
type.
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