| IDL 6.1 create_struct() peculiarity [message #44199] |
Tue, 31 May 2005 13:00  |
Justin Bronn
Messages: 2
Registered: May 2005
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Junior Member |
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So I'm working with an existing piece of software that uses the
execute() function to resolve structures:
IDL> sname = 'xosimple'
IDL> stmt = 'struct = {' + sname + '}'
IDL> struct = execute(stmt)
I want to get rid of the execute() call because it is not allowed when
running the VM (a nasty little error message will greet the VM user).
I thought I was smart, and I found a way around this, by using the
create_struct() function instead:
IDL> struct = create_struct(NAME=sname)
Now while this seems to work great at the IDL command line, when I try
to embed this method into a callable procedure, the create_struct()
throws a strange warning message (but doesn't stop the execution of the
code):
% CREATE_STRUCT: Unexpected keyword cleanup stack found on return.
When trying this method out on IDL 5.6, I get the following error
message:
% CREATE_STRUCT: Incorrect number of arguments.
So here's my stab at what I think is going on: RSI decided to allow
the create_struct() method to be called with only the NAME keyword set
in IDL 6.0, however they forgot to do all the testing so it doesn't
clean up the C keyword arguments properly when called in a
non-interactive mode.
Below is the code for a procedure that embeds this create_struct()
method, and the sample structure definition file that should re-create
this issue (FYI - I'm using IDL 6.1.1 on Linux - Fedora Core1).
Should I worry about this warning message? If anyone has any insight,
please enlighten me & the newsgroup :)
Thanks,
-Justin
;; init_structs.pro
;;
;; Routine that will initialize structures that have
;; their definition in a certain filename. Needs the
;; definition files to be in the same directory.
pro init_structs
files = file_search('./xo*__define.pro', COUNT=count)
if count eq 0 then $
message, 'Could not find any structure definition files!'
for i = 0L, count-1 do begin
strings = stregex(files[i], '(xo.*)__define.pro' $
, /EXTRACT, /SUBEXPR)
struct_name = strings[1]
struct = create_struct(NAME=struct_name)
endfor
end
;; xosimple__define.pro
;;
;; Simple structure definition file
pro xosimple__define
temp = {xosimple, $
title:'', $
int_value:0, $
float_value:0.0 $
}
end
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| Re: IDL 6.1 create_struct() peculiarity [message #44292 is a reply to message #44199] |
Wed, 01 June 2005 08:12  |
R.G. Stockwell
Messages: 363
Registered: July 1999
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Senior Member |
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"Justin Bronn" <jbronn@swri.edu> wrote in message
news:1117569650.819400.258050@g43g2000cwa.googlegroups.com.. .
...
> IDL> struct = create_struct(NAME=sname)
>
> Now while this seems to work great at the IDL command line, when I try
> to embed this method into a callable procedure, the create_struct()
> throws a strange warning message (but doesn't stop the execution of the
> code):
>
> % CREATE_STRUCT: Unexpected keyword cleanup stack found on return.
I have tried this, and I also get that warning message.
The very odd thing though, is that I do NOT get the warning if
I send in the string differently.
i.e., the following works just fine.
namein = 'xosimple'
struct = create_struct(NAME=namein)
Perhaps it is something strange with the string being created with
the stregex() function. Something internal to IDL, cause I cannot
see the difference. In fact,
print, namein eq struct_name
returns a 1, indicating that the strings are identical.
Very weird. I suggest sending in a bug report to RSI.
Cheers,
bob
PS
DL> help,!version,/st
** Structure !VERSION, 8 tags, length=76, data length=76:
ARCH STRING 'x86'
OS STRING 'Win32'
OS_FAMILY STRING 'Windows'
OS_NAME STRING 'Microsoft Windows'
RELEASE STRING '6.1.1'
BUILD_DATE STRING 'Oct 11 2004'
MEMORY_BITS INT 32
FILE_OFFSET_BITS
INT 64
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