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Re: File units (de)allocation in IDL - what is the proper way? [message #93460 is a reply to message #93459]

Fri, 22 July 2016 02:51

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Friday, July 22, 2016 at 11:05:09 AM UTC+2, Dave wrote:
> Hello everyone,
> when opening files to write outputs I usually do:
>
> OPENW, unit1, 'file1.txt', /GET_LUN
> OPENW, unit2, 'file2.txt', /GET_LUN
> ...
> CLOSE, unit1
> CLOSE, unit2
>
> FREE_LUN, unit1
> FREE_LUN, unit2
>
> However, it seems that closing *and freeing* can be equally achieved with:
>
> CLOSE, unit1, unit2, /ALL
>
> Is this correct? Is there a best practice?
> Thanks in advance.
> Dave

I don't think so.
These commands:

CLOSE, unit1
CLOSE, unit2

are the same as

CLOSE, unit1, unit2

But this command could do much more:

CLOSE, unit1, unit2, /all

In fact it will close *all* open units. And you don't need to specify the units at all. In other words it is equivalent to:

CLOSE, /ALL

Now you should see the problem: If you have other units open, this will close them. So it is only useful if you lost track of open units and you want to close them all... Otherwise you might close units that you don't want to close at all.

I hope this helps.

Cheers,
Helder

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[Message index]

		File units (de)allocation in IDL - what is the proper way? By: DAVIDE LENA on Fri, 22 July 2016 02:05
		Re: File units (de)allocation in IDL - what is the proper way? By: Helder Marchetto on Fri, 22 July 2016 02:51
		Re: File units (de)allocation in IDL - what is the proper way? By: Markus Schmassmann on Fri, 22 July 2016 03:43

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