| (Beginner) issue setting variables using ENVI_FILE_QUERY [message #86286] |
Wed, 23 October 2013 03:05  |
Simon Mitchell
Messages: 6
Registered: October 2013
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Junior Member |
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Hello All,
I am having an issue when using ENVI_FILE_QUERY to set a variable containing the number of samples and number of lines from an opened image. This is possibly a very simple mistake that I am making, but I cannot see where I am going wrong (I am new to IDL, but having to update old existing code).
My code loops through a directory and opens .TIF images, to perform processing on.
------------------------------------------------------------ -------------
PRO CALL_HOTSPOT
COMMON PARAM, ns, nl, ifname, ofname, w, yd1, iyd, ib, yy
COMMON NAMES, opendir
COMMON LOOP, count_str
;Scan the tif_output directory for all files
tifdir = opendir + 'Tif_Output\'
CD, tifdir
tif_files = FILE_SEARCH('*.tif', COUNT = numfiles)
counter = 0
WHILE (counter LT numfiles) DO BEGIN
count_str = STRTRIM(STRING(counter), 2)
ifname = tif_files(counter)
OPENR, lun_tif, ifname, /GET_LUN
;determine the number of samples and lines
ENVI_FILE_QUERY, lun_tif, NS=ns, NL=nl
print, ns
; Call the TET algorithm
TET_HOTSPOT_IDL_MAIN_SIMULATION_SM
CLOSE, lun_tif
FREE_LUN, lun_tif
counter = counter + 1
ENDWHILE
END
------------------------------------------------------------ -------------
The error that I am getting is:
% PRINT: Variable is undefined: NS (PARAM).
Would anyone be able to help me with this?
Thanks in advance
Simon
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| Re: (Beginner) issue setting variables using ENVI_FILE_QUERY [message #86288 is a reply to message #86286] |
Wed, 23 October 2013 06:28  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Simon Mitchell writes:
> I am having an issue when using ENVI_FILE_QUERY to set a variable
containing the number of samples and number of lines from an opened
image. This is possibly a very simple mistake that I am making, but I
cannot see where I am going wrong (I am new to IDL, but having to update
old existing code).
> ;determine the number of samples and lines
>
> ENVI_FILE_QUERY, lun_tif, NS=ns, NL=nl
>
> The error that I am getting is:
> % PRINT: Variable is undefined: NS (PARAM).
>
> Would anyone be able to help me with this?
Instead of using ENVI_FILE_QUERY here, you want to use QUERY_TIFF:
void = Query_Tiff(ifname, fileInfo)
dims = fileInfo.dimensions
ns = dims[0]
nl = dims[1]
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: (Beginner) issue setting variables using ENVI_FILE_QUERY [message #86289 is a reply to message #86288] |
Wed, 23 October 2013 07:21 |
Simon Mitchell
Messages: 6
Registered: October 2013
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Junior Member |
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On Wednesday, 23 October 2013 15:28:45 UTC+2, David Fanning wrote:
> Simon Mitchell writes:
>
>
>
>> I am having an issue when using ENVI_FILE_QUERY to set a variable
>
> containing the number of samples and number of lines from an opened
>
> image. This is possibly a very simple mistake that I am making, but I
>
> cannot see where I am going wrong (I am new to IDL, but having to update
>
> old existing code).
>
>
>
>> ;determine the number of samples and lines
>
>>
>
>> ENVI_FILE_QUERY, lun_tif, NS=ns, NL=nl
>
>>
>
>> The error that I am getting is:
>
>> % PRINT: Variable is undefined: NS (PARAM).
>
>>
>
>> Would anyone be able to help me with this?
>
>
>
> Instead of using ENVI_FILE_QUERY here, you want to use QUERY_TIFF:
>
>
>
> void = Query_Tiff(ifname, fileInfo)
>
> dims = fileInfo.dimensions
>
> ns = dims[0]
>
> nl = dims[1]
>
>
>
> Cheers,
>
>
>
> David
>
> --
>
> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")
Hello David,
Thank you for your help.
I used your example code, but I get another error.
% Expression must be a structure in this context: FILEINFO.
With the "dims = fileInfo.dimensions" highlighted.
Would you please be able to tell me what this means?
Regards
Simon
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| Re: (Beginner) issue setting variables using ENVI_FILE_QUERY [message #86312 is a reply to message #86286] |
Fri, 25 October 2013 05:04 |
Josh Sixsmith
Messages: 13
Registered: December 2012
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Junior Member |
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Seeing as you are still trying to use ENVI_FILE_QUERY, i suggest you ditch the call to openr, which is meant for access to a file on disk. ENVI_FILE_QUERY uses an fid to track files, and this is what you need to pass to ENVI_FILE_QUERY, not the file allocation unit.
If you want ENVI to open the file and then you can pass around the fid to all sorts of ENVI_DO_IT routines, then use ENVI_OPEN_DATA_FILE with the /TIFF keyword set for ENVI to automatically open the TIFF file. ENVI will internally keep track of the fid and you just pass around the fid to all sorts of ENVI related functions and procedures.
Cheers
Josh
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