| Re: Object as a member to object/class [message #58696] |
Tue, 12 February 2008 16:50  |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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A few more comments...
On Feb 12, 1:45 pm, Sven Utcke <utcke+n...@informatik.uni-hamburg.de>
wrote:
> PRO MODBUS__DEFINE
> struct = { MODBUS, Host:"hasgkssccdkal.desy.de", Port:502, tid:0L }
> END
Be careful here. Those values "hasgkssccdkal.desy.de", 502, and 0L are
only used for their type. The actual values are thrown away. Normally,
I do something like:
struct = { MODBUS, host: '', port: 0, tid: 0L }
so I don't fool myself.
I second that you should read David's article (N_ELEMENTS is probably
what you want to use in GKSSBC::INIT).
Mike
--
www.michaelgalloy.com
Tech-X Corporation
Software Developer II
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| Re: Object as a member to object/class [message #58698 is a reply to message #58696] |
Tue, 12 February 2008 14:10  |
ben.bighair
Messages: 221
Registered: April 2007
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Senior Member |
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On Feb 12, 3:45 pm, Sven Utcke <utcke+n...@informatik.uni-hamburg.de>
wrote:
> Hi,
>
> I'm plainly too stupid for the following: I would like to have an
> object as a member to a second class. I.e. I have something like
> this:
>
> PRO MODBUS__DEFINE
> struct = { MODBUS, Host:"hasgkssccdkal.desy.de", Port:502, tid:0L }
> END
>
> and, later on,
>
> PRO GKSSBC__DEFINE
> struct = { GKSSBC, Con:Obj_New(), addr:'4020'XL, Factor:1.0, Steps:200, Micro:6 }
> END
>
> Now, I would _like_ to do something like
>
> FUNCTION GKSSBC::INIT, addr = addr, factor = factor, con = con
> IF KEYWORD_SET(addr) THEN self.Addr = addr ELSE self.Addr = '4020'XL
> IF KEYWORD_SET(factor) THEN self.Factor = factor ELSE self.Factor = 1.0
> IF KEYWORD_SET(con) THEN self.Con = con ELSE self.Con = obj_new("modbus")
> return, 1
> END
>
> But even just doing
>
> FUNCTION GKSSBC::INIT
> self.Con = obj_new("modbus")
> return, 1
> END
>
> does't wor at all in IDL 6.4 (it results in something like:
>
> % Object reference expression not allowed in this context: <OBJREF
> (<ObjHeapVar38(MODBUS)>)>.
> % Execution halted at: GKSSBC::INIT 13
> /afs/desy.de/user/u/utcke/src/Modbus/gkss9100C.pro
> % OBJ_NEW
> % $MAIN$
>
> So how does this _really_ work?
Hi,
No such thing as too stupid. Learning curves can be twisted, that's
all. My first thought is that MODBUS does not have an MODBUS::INIT
method since you don't show it. Can you successfully instantiate a
MODBUS object on its own? Like...
IDL> obj = OBJ_NEW("MODBUS")
On a different note, you might find it fruitful to look at David
Fanning's excellent description of when to use KEYWORD_SET vs.
N_ELEMENTS. http://www.dfanning.com/tips/keyword_check.html
Cheers,
Ben
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| Re: Object as a member to object/class [message #58699 is a reply to message #58698] |
Tue, 12 February 2008 13:57 |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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On Feb 12, 1:45 pm, Sven Utcke <utcke+n...@informatik.uni-hamburg.de>
wrote:
> I'm plainly too stupid for the following: I would like to have an
> object as a member to a second class. I.e. I have something like
> this:
>
> PRO MODBUS__DEFINE
> struct = { MODBUS, Host:"hasgkssccdkal.desy.de", Port:502, tid:0L }
> END
>
> and, later on,
>
> PRO GKSSBC__DEFINE
> struct = { GKSSBC, Con:Obj_New(), addr:'4020'XL, Factor:1.0, Steps:200, Micro:6 }
> END
>
> Now, I would _like_ to do something like
>
> FUNCTION GKSSBC::INIT, addr = addr, factor = factor, con = con
> IF KEYWORD_SET(addr) THEN self.Addr = addr ELSE self.Addr = '4020'XL
> IF KEYWORD_SET(factor) THEN self.Factor = factor ELSE self.Factor = 1.0
> IF KEYWORD_SET(con) THEN self.Con = con ELSE self.Con = obj_new("modbus")
> return, 1
> END
>
> But even just doing
>
> FUNCTION GKSSBC::INIT
> self.Con = obj_new("modbus")
> return, 1
> END
>
> does't wor at all in IDL 6.4 (it results in something like:
>
> % Object reference expression not allowed in this context: <OBJREF
> (<ObjHeapVar38(MODBUS)>)>.
> % Execution halted at: GKSSBC::INIT 13
> /afs/desy.de/user/u/utcke/src/Modbus/gkss9100C.pro
> % OBJ_NEW
> % $MAIN$
>
> So how does this _really_ work?
>
> Any help appreciated!
Your code works for me. The only thing I can think of is that you
might have changed the definition of self.con without .reset-ing or
exiting IDL?
Mike
--
www.michaelgalloy.com
Tech-X Corporation
Software Developer II
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| Re: Object as a member to object/class [message #58765 is a reply to message #58699] |
Thu, 14 February 2008 06:13 |
Sven Utcke
Messages: 10
Registered: October 2007
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Junior Member |
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"mgalloy@gmail.com" <mgalloy@gmail.com> writes:
> On Feb 12, 1:45�pm, Sven Utcke <utcke+n...@informatik.uni-hamburg.de>
> wrote:
>> I'm plainly too stupid for the following: I would like to have an
>> object as a member to a second class. �I.e. I have something like
>> this:
> Your code works for me.
And so it does indeed. Today.
> The only thing I can think of is that you
> might have changed the definition of self.con without .reset-ing or
> exiting IDL?
Sounds very likely indeed.
Thank you very much (also the other two posters) for your help. It
now works exactly as intended (well, the cases I have tested so far
:-)...
Sven
--
___ _ _____ ___ Dr.-Ing. Sven Utcke ___ ___ _____ __
/ __| |/ / __| __| phone: +49 40 8998-5317 | \| __/ __\ \ / /
| (_ | ' <\__ \__ \ fax : +49 40 8994-5317 (NEW) | |) | _|\__ \\ V /
\___|_|\_\___|___/ http://www.desy.de/~utcke (to come)|___/|___|___/ |_|
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