| Referencing structure inline [message #89832] |
Mon, 08 December 2014 20:57  |
TimB
Messages: 6
Registered: April 2011
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Junior Member |
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Perhaps a fundamental misunderstanding on my part but I'm wondering if there is a way of making this work:
IDL> z = {x:1,y:2}
IDL> z.x
1
IDL> ({x:1,y:2}).x
% Object reference type required in this context: <STRUCT Array[1]>.
I have a function which returns a structure and I would like to use it in this manner:
z = (myfunc(input)).x
However I get the same error as the example above. The following works
struct = myfunc(input)
z = struct.x
Can it be done in one line?
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| Re: Referencing structure inline [message #89836 is a reply to message #89834] |
Tue, 09 December 2014 02:55  |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Tuesday, December 9, 2014 9:42:57 AM UTC+1, Heinz Stege wrote:
> Seems to be a bug in your IDL version. The following works in IDL 8.0:
>
> IDL> help,file_info(!dir)
> ** Structure FILE_INFO, 21 tags, length=64, data length=63:
> NAME STRING 'C:\idl\idl80'
> EXISTS BYTE 1
> READ BYTE 1
> WRITE BYTE 1
> EXECUTE BYTE 1
> REGULAR BYTE 0
> DIRECTORY BYTE 1
> BLOCK_SPECIAL BYTE 0
> CHARACTER_SPECIAL
> BYTE 0
> NAMED_PIPE BYTE 0
> SETUID BYTE 0
> SETGID BYTE 0
> SOCKET BYTE 0
> STICKY_BIT BYTE 0
> SYMLINK BYTE 0
> DANGLING_SYMLINK
> BYTE 0
> MODE LONG 511
> ATIME LONG64 1418112222
> CTIME LONG64 1299161262
> MTIME LONG64 1349551389
> SIZE LONG64 0
> IDL> print,(file_info(!dir)).name
> C:\idl\idl80
> IDL> print,(file_info(!dir)).ctime
> 1299161262
> IDL> print,!version
> { x86 Win32 Windows Microsoft Windows 8.0.1 Oct 5 2010 32
> 64}
Hi,
If this is a bug then it's still out there. Implied print seems to be the problem:
IDL> ({x:1,y:2}).x
% Object reference type required in this context: <STRUCT Array[1]>.
% Execution halted at: $MAIN$
IDL> print, ({x:1,y:2}).x
1
IDL> !version
{
"ARCH": "x86_64",
"OS": "Win32",
"OS_FAMILY": "Windows",
"OS_NAME": "MicrosoftWindows",
"RELEASE": "8.4",
"BUILD_DATE": "Sep272014",
"MEMORY_BITS": 64,
"FILE_OFFSET_BITS": 64
}
In other words, such indexing does not work with implied print.
I also tried this with a function:
function testPrintFunction
return, {x:1,y:2}
end
IDL> (testPrintFunction()).x
% Object reference type required in this context: <STRUCT Array[1]>.
% Execution halted at: $MAIN$
IDL> print, (testPrintFunction()).x
1
Cheers,
Helder
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| Re: Referencing structure inline [message #89837 is a reply to message #89836] |
Tue, 09 December 2014 02:56 |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Tuesday, December 9, 2014 11:55:02 AM UTC+1, Helder wrote:
> On Tuesday, December 9, 2014 9:42:57 AM UTC+1, Heinz Stege wrote:
>> Seems to be a bug in your IDL version. The following works in IDL 8.0:
>>
>> IDL> help,file_info(!dir)
>> ** Structure FILE_INFO, 21 tags, length=64, data length=63:
>> NAME STRING 'C:\idl\idl80'
>> EXISTS BYTE 1
>> READ BYTE 1
>> WRITE BYTE 1
>> EXECUTE BYTE 1
>> REGULAR BYTE 0
>> DIRECTORY BYTE 1
>> BLOCK_SPECIAL BYTE 0
>> CHARACTER_SPECIAL
>> BYTE 0
>> NAMED_PIPE BYTE 0
>> SETUID BYTE 0
>> SETGID BYTE 0
>> SOCKET BYTE 0
>> STICKY_BIT BYTE 0
>> SYMLINK BYTE 0
>> DANGLING_SYMLINK
>> BYTE 0
>> MODE LONG 511
>> ATIME LONG64 1418112222
>> CTIME LONG64 1299161262
>> MTIME LONG64 1349551389
>> SIZE LONG64 0
>> IDL> print,(file_info(!dir)).name
>> C:\idl\idl80
>> IDL> print,(file_info(!dir)).ctime
>> 1299161262
>> IDL> print,!version
>> { x86 Win32 Windows Microsoft Windows 8.0.1 Oct 5 2010 32
>> 64}
>
>
> Hi,
> If this is a bug then it's still out there. Implied print seems to be the problem:
>
> IDL> ({x:1,y:2}).x
> % Object reference type required in this context: <STRUCT Array[1]>.
> % Execution halted at: $MAIN$
> IDL> print, ({x:1,y:2}).x
> 1
> IDL> !version
> {
> "ARCH": "x86_64",
> "OS": "Win32",
> "OS_FAMILY": "Windows",
> "OS_NAME": "MicrosoftWindows",
> "RELEASE": "8.4",
> "BUILD_DATE": "Sep272014",
> "MEMORY_BITS": 64,
> "FILE_OFFSET_BITS": 64
> }
>
> In other words, such indexing does not work with implied print.
>
> I also tried this with a function:
>
> function testPrintFunction
> return, {x:1,y:2}
> end
>
> IDL> (testPrintFunction()).x
> % Object reference type required in this context: <STRUCT Array[1]>.
> % Execution halted at: $MAIN$
> IDL> print, (testPrintFunction()).x
> 1
>
> Cheers,
> Helder
Here is a link with some explanation. I'm sure it falls under the same problem pointed out by Chris T.
https://groups.google.com/d/msg/comp.lang.idl-pvwave/rbleuyI 6GfA/vIi09AwC0rEJ
Cheers,
Helder
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