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Re: End of Array - like - End Of File [message #26281 is a reply to message #25952]

Mon, 20 August 2001 07:36

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Timm Weitkamp wrote:
>
> Reimar's suggestion of using the COUNT keyword to FINDFILE is indeed
> *much* better than using N_ELEMENTS, because the latter will result in
> an error when the file list is empty (unless you use an additional
> line to catch that situation). The reason is that when FINDFILE finds
> no matches, its return value is a scalar null string, and N_ELEMENTS()
> of that is one (not zero).
>
> Reimar Bauer <r.bauer@fz-juelich.de> wrote in message news:<3B7FF5BE.526BE6@fz-juelich.de>...
>> "Emmler, Oliver" wrote:
>>>
>>> Hi all,
>>> i have a directory with different numbers of files. I read the filenames by
>>>
>>> text = FINDFILE('H:/radiologie/*.dcm')
>>
>> you should use the count keyword of findfile
>>
>> Result = FINDFILE( File_Specification [, COUNT=variable] )
>>
>> FOR i=0,count-1 do ...
>>
>> regards
>> Reimar

I actually prefer the following syntax:

list = findfile('*.dcm')
if (list[0] ne '') then begin
;- process each name in list
endif

This takes advantage of the fact that FINDFILE returns a null string if
no files are found.

Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/

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[Message index]

		End of Array - like - End Of File By: Emmler, Oliver on Fri, 27 July 2001 08:59
		Re: End of Array - like - End Of File By: Liam E. Gumley on Mon, 20 August 2001 07:36
		Re: End of Array - like - End Of File By: R.Bauer on Fri, 24 August 2001 03:02
		Re: End of Array - like - End Of File By: weitkamp on Mon, 20 August 2001 00:46
		Re: End of Array - like - End Of File By: R.Bauer on Sun, 19 August 2001 10:22

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