| Re: objects, crashes, and negative memory oh my [message #51638 is a reply to message #51635] |
Fri, 01 December 2006 11:19   |
Karl Schultz
Messages: 341
Registered: October 1999
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Senior Member |
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On Fri, 01 Dec 2006 11:41:08 -0700, Jean H. wrote:
> Pete Warner wrote:
>> Here's a program that crashes me every time. The key part seems to be
>> the "file_search" followed by the "and" statement. Take either out and
>> it doesn't cause me trouble. I'm creating the .txt file because I don't
>> know what to search for on your computers, and file_search needs to
>> find something. I run between 1 and 10 loops before IDL dies on my
>> computer. Tested on 6.1 and 6.3.
>
> even a 1 line
> IDL> a = file_search() & print, 'test ' and a
> makes IDL crash...
> IDL> print, !version
> { x86 Win32 Windows Microsoft Windows 6.3 Mar 23 2006 32 64}
>
> Jean
Ouch. Ok I'll open a bug report and we'll try to fix it for next release.
I've spent a little time looking for a workaround and didn't have much
luck.
About all I can suggest is looking at how the AND operator works on
non-numeric values and maybe changing your code to do the same thing
without using AND.
Docs say:
For operations on other types, the result is equal to the second
operand if the first operand is not equal to zero or the null string;
otherwise, the result is zero or the null string.
So you might replace:
print, 'anystring' and b
with
print, 'anystring' ne '' ? b : ''
Now 'anystring' ne '' doesn't make sense unless 'anystring' is another
variable.
Entire program, with a workaround:
pro testfailure
a = 'test_file.txt'
openw, 1, a
close, 1
free_lun, 1
key = 'b'
any = 'anystring'
count = 0
print, 'Starting Memory: ', memory(/current)
while (key ne 'a') do begin
count++
b = file_search(a)
print, any ne '' ? b : ''
print, 'Memory after iteration ', count, ', ', memory(/current)
print, 'Hit "a" to exit, anykey to continue'
key = get_kbrd(1)
endwhile
print, 'ending'
end
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