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Re: IDL 8.0 questions [message #71816 is a reply to message #71815]

Sun, 25 July 2010 10:20

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

I just did some tests, and I can confirm that this is a bug, it is
completely reproducible, and it is not limited to Windows. I tried on
Vista 32 with similar results. In Linux 64, besides the problem as
reported (the string contents getting changed), IDL crashes. Same on
command line and Workbench.

This is what I used:

pro test_foreach
compile_opt IDL2

file_names=(file_search('*.fits'))[0:1]

for i=0,n_elements(file_names)-1 do begin
qfile = file_names[i]
help,qfile,i
qim = readfits( qfile )
help,qfile
endfor

foreach qfile, file_names,i do begin
print,i
qim = readfits( qfile )
endforeach

print,file_names
end

Then it crashes on the first call to readfits() in the foreach loop:

IDL> test_foreach
QFILE STRING = 'dec18i0001.fits'
I LONG = 0
% READFITS: Now reading 256 by 256 array
QFILE STRING = 'dec18i0001.fits'
QFILE STRING = 'dec18i0002.fits'
I LONG = 1
% READFITS: Now reading 256 by 256 array
QFILE STRING = 'dec18i0002.fits'
0
% READFITS: ERROR - Unable to locate file ts
*** glibc detected *** /usr/local/itt/idl/idl80/bin/bin.linux.x86_64/
idl: double free or corruption (fasttop): 0x0000000001ff7a80 ***

Even more strange, if I change the line before that to

print,i,' ',qfile

All goes as it should:

IDL> test_foreach
QFILE STRING = 'dec18i0001.fits'
I LONG = 0
% READFITS: Now reading 256 by 256 array
QFILE STRING = 'dec18i0001.fits'
QFILE STRING = 'dec18i0002.fits'
I LONG = 1
% READFITS: Now reading 256 by 256 array
QFILE STRING = 'dec18i0002.fits'
0 dec18i0001.fits
% READFITS: Now reading 256 by 256 array
1 dec18i0002.fits
% READFITS: Now reading 256 by 256 array
dec18i0001.fits dec18i0002.fits

In the few months I had been using the test releases for IDL 8, I
never saw something like this. I tested on Tech Preview 3, and found
it also crashes, though in a different way.

I am going to look into it in more detail, to see if I can tell where
the value of qfile gets changed. And I am reporting this to ITTVIS.

Report message to a moderator

[Message index]

		Re: IDL 8.0 questions By: David Fanning on Sun, 25 July 2010 12:33
		Re: IDL 8.0 questions By: penteado on Sun, 25 July 2010 12:11
		Re: IDL 8.0 questions By: Mike Potter on Sun, 25 July 2010 11:15
		Re: IDL 8.0 questions By: penteado on Sun, 25 July 2010 10:20
		Re: IDL 8.0 questions By: penteado on Sun, 25 July 2010 09:27
		Re: IDL 8.0 questions By: Mike Potter on Sun, 25 July 2010 08:22
		Re: IDL 8.0 questions By: Mike Potter on Sun, 25 July 2010 07:22
		Re: IDL 8.0 questions By: wlandsman on Sun, 25 July 2010 04:12
		Re: IDL 8.0 questions By: Mike Potter on Sat, 24 July 2010 23:07
		Re: IDL 8.0 questions By: penteado on Sat, 24 July 2010 16:24
		Re: IDL 8.0 questions By: Mike Potter on Sat, 24 July 2010 10:50
		Re: IDL 8.0 questions By: David Fanning on Sat, 24 July 2010 10:09
		Re: IDL 8.0 questions By: penteado on Mon, 26 July 2010 08:57

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