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Re: C++ and CALL_EXTERNAL [message #60622 is a reply to message #60621]

Fri, 30 May 2008 03:45

mark.t.douglas
Messages: 7
Registered: January 2005

Junior Member

On 30 May, 01:46, Robbie <ret...@iinet.net.au> wrote:
> I would recommend making your own DLM's in preference to using
> CALL_EXTERNAL and /AUTO_GLUE. Making your own DLM is a bit more
> tedious but gives you more control in the way that IDL variables are
> type cast.
>
> If your keen to get dirty with C++ then I would recommend having a
> look at my examples of converting Boost::MultiArray objects to and
> from IDL Variables.
>
> I take advantage of template specialization so that you only need to
> ever use two functions:
>
> const IDL_TYPE i = idl_cast_in<IDL_TYPE>(argv[0]);
>
> and
>
> idl_cast_out(argv[1],i);
>
> Source code available from
>
> http://barnett.id.au/idl/
>
> Robbie

Making a DLM is overkill for this specific DLL - all I really want to
do is plot f(x) for f in the DLL, and I can wrap the call_externals
using stub functions to give a modicum of type safety:

function f,x
if ~ n_elements(x) eq 1 then return,0.d0
return,call_external('my.dll','function_name',double(x),/
d_value,values=[0])
end

That boost stuff, however, is very neat: thanks for the pointer :)

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[Message index]

		Re: C++ and CALL_EXTERNAL By: jameskuyper on Fri, 30 May 2008 04:12
		Re: C++ and CALL_EXTERNAL By: mark.t.douglas on Fri, 30 May 2008 03:45
		Re: C++ and CALL_EXTERNAL By: mark.t.douglas on Fri, 30 May 2008 03:26
		Re: C++ and CALL_EXTERNAL By: Robbie on Thu, 29 May 2008 17:46
		Re: C++ and CALL_EXTERNAL By: jameskuyper on Thu, 29 May 2008 04:20

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