comp.lang.idl-pvwave archive - RDF feed
type: channel
description: Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
items: Re: multiple filters
items: multiple filters take 2

Re: multiple filters
type: item
description: Rochelle Hatton (nrh@imag.wsahs.nsw.gov.au) writes: > I've trawled the archives, with little luck, but hopefully it's > an easy question - is there a workaround to use more than one > filter in DIALOG_PICKFILE ? > Or has someone got a nice tidy little programto do this? > All the ones I have are a bit too involved for what I need. I presume you are using a PC version of IDL, since a single file filter has been the only option there for some time. DIALOG_PICKFILE has been made marginally smarter in IDL 5.4, in that you can now specify a string array of file filters and it will recognize all of them. Unfortunately, the filters are listed on a single filter line in the little droplist widget that shows the filters, so it is an all or nothing kind of thing. Every other Windows application I've ever used separates each individual filter, which I presume is what we were looking for when we asked for this feature. :-( Perhaps we should file another feature request. Cheers, David -- David Fanning, Ph.D. Fanning Software Consulting Phone: 970-221-0438 E-Mail: davidf@dfanning.com Coyote's Guide to IDL Programming: http://www.dfanning.com/ Toll-Free IDL Book Orders: 1-888-461-0155
creator: davidf
date: 2001-01-16T14:43:35-00:00

Re: multiple filters
type: item
description: David Fanning wrote: > I presume you are using a PC version of IDL, since a > single file filter has been the only option there for > some time. DIALOG_PICKFILE has been made marginally > smarter in IDL 5.4, in that you can now specify a > string array of file filters and it will recognize > all of them. > Actually, I am using IDL on a Sun. We have a few different versions of IDL due to the versions of Unix we have installed around the place. I was working in 5.1(I know, I know) to ensure compatibility on all our systems when I first posted my query. Strangely, I was reading the online help about dialog_pickfile in 5.4 and came across this: "On UNIX, the FILTER keyword does not support specifying more than one filter. If you specify more than one filter, all files in the current directory will be displayed. For example, to display only files of type .jpg, .tif, or .png in the file selection window, you could use the following code: file = DIALOG_PICKFILE(/READ, $ FILTER = ['*.jpg', '*.tif', '*.png'])..." Sounds like some obscure alien talk to me - doesn't this sound a little contradictory? First it says it won't work, and then it gives an example of how it *would* work.Or perhaps the example is actually about the paragraph much earlier - for Windows? I tried it anyway, and what actually happens at the start is that the files displayed use the first filter in the array. After that(when you change directories), nothing gets displayed - completely the opposite to what the help file says! Curiouser and curiouser.... All that grumbling late last year on the newsgroup about reading documentation...I guess it helps if the documentation is clear:) -- Basic research is what I am doing when I don't know what I am doing. Werner Von Braun (1912-1977) German rocket engineer Rochelle Hatton Department of Nuclear Medicine and Ultrasound Westmead Hospital ph(02) 9845 7223
creator: nrh
date: 2001-01-16T21:58:34-00:00

Re: multiple filters
type: item
description: Well I feel totally stupid now - just as well most of you are asleep. I discovered that I wasn't using dialog_pickfile at all, but a custom version we wrote years ago, that uses SPAWN. Allow me to dig a hole and bury myself :) ...The help documentation is still an enigma though.., -- Basic research is what I am doing when I don't know what I am doing. Werner Von Braun (1912-1977) German rocket engineer Rochelle Hatton Department of Nuclear Medicine and Ultrasound Westmead Hospital
creator: nrh
date: 2001-01-16T22:09:26-00:00

Re: multiple filters
type: item
description: Rochelle Hatton (nrh@imag.wsahs.nsw.gov.au) writes: > The help documentation is still an enigma though.., Well, it weeds out the rift-raft. :-) Cheers, David P.S. I just re-read the documentation for Dialog_Pickfile. Let's just say it hasn't marginally *improved* since IDL 5.1. :-) -- David Fanning, Ph.D. Fanning Software Consulting Phone: 970-221-0438 E-Mail: davidf@dfanning.com Coyote's Guide to IDL Programming: http://www.dfanning.com/ Toll-Free IDL Book Orders: 1-888-461-0155
creator: davidf
date: 2001-01-16T22:49:57-00:00

multiple filters take 2
type: item
description: A few days ago I asked about the possibility of using multiple file filters with a file selection program. After much fiddling with an old program, I decided to have a go at writing a new version that uses DIALOG_PICKFILE. My question still remains - the help on DIALOG_PICKFILE seems make no sense - is it a Windows only option? I can't work out from the help whether it is possible on Unix, or is it a feature request for RSI? Alternatively, has anyone written their own version to allow for more than one filter? -- Basic research is what I am doing when I don't know what I am doing. Werner Von Braun (1912-1977) German rocket engineer Rochelle Hatton Department of Nuclear Medicine and Ultrasound Westmead Hospital
creator: nrh
date: 2001-01-18T05:13:42-00:00

Re: multiple filters
type: item
description: Rochelle Hatton wrote: > > Actually, I am using IDL on a Sun. We have a few different > versions of IDL due to the versions of Unix we have installed > around the place. > I was working in 5.1(I know, I know) to ensure compatibility on > all our systems when I first posted my query. > > Strangely, I was reading the online help about dialog_pickfile in 5.4 > and came across this: > "On UNIX, the FILTER keyword does not support specifying more > than one filter. > If you specify more than one filter, all files in the current > directory will be displayed. > For example, to display only files of type .jpg, .tif, or > .png in the file selection window, you could use the > following code: > file = DIALOG_PICKFILE(/READ, $ > FILTER = ['*.jpg', '*.tif', '*.png'])..." > > Rochelle Hatton > Department of Nuclear Medicine and Ultrasound > Westmead Hospital > ph(02) 9845 7223 It's a little while since you asked this question, but maybe you are still interested in how to do this? What is meant with "a single filter" is a little ambiguous: do you want all these files displayed simultaneously (as in your example, where you want all "image" files), or do you want to select different file types exclusively (these are ususally listed in a drop down box). Now, the Unix filter only allows one "exclusive" selection, but (contrary to the Windows version) can be edited by the user. I have never tried to use the simulataneous entries which according to the documentation should work as you suggest, but you can achieve such an effect with something like "*." (often it is sufficiently exact to specify something like "*.[jtp]??" instead). In summary: take advantage of the way Unix expands wild cards. Cheers, Martin -- [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[ [[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[ [[ Bundesstr. 55, 20146 Hamburg [[ [[ phone: +49 40 41173-308 [[ [[ fax: +49 40 41173-298 [[ [[ martin.schultz@dkrz.de [[ [[[[[[[[[[[[[[[[[[[[[[[[[…
creator: Martin Schultz
date: 2001-02-06T12:02:24-00:00