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Re: Checking version number [message #66831 is a reply to message #66828] Fri, 12 June 2009 14:52 Go to previous message
R.G. Stockwell is currently offline  R.G. Stockwell
Messages: 363
Registered: July 1999
Senior Member
"Kenneth P. Bowman" <k-bowman@null.edu> wrote in message
news:k-bowman-2E3784.16284012062009@news.tamu.edu...
> I don't like to write version-dependent code, but with the improved PS
> driver in IDL 7.1 I would like to keep my old workarounds for 24-bit
> color available.
>
> The quantity stored in !VERSION is a string
>
> IDL> help, !version.release
> <Expression> STRING = '7.1'
>
> But this is not simple to convert to a number, because there are
> instances like this
>
> IDL> help, !version.release
> <Expression> STRING = '6.4.1'
>
> Is there an easy way to test whether the version is greater than or equal
> to 7.1?
>
> Ken Bowman

how bout just parsing the field, and multiplying it by an increasing
number of powers of ten.

6.4.1 becomes 600 +40 + 1

7.1 becomes 700 +10 + 0

7.1.1.1.1.1.1.1.1.1.1.1 becomes 700 +10 + 1 + 0.1 + 0.01 ...etc

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