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MathGroup Archive 2005

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Re: NET/Link return array from C++

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61159] Re: NET/Link return array from C++
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 11 Oct 2005 04:49:55 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <di2m5s$8d6$1@smc.vnet.net><di5915$3bl$1@smc.vnet.net> <difr8h$feb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi

I mean send it manual and create a 
Wolfram.NETLink.Expr that
you can return.

Regards
  Jens

"Lasr Schouw" <schouw at gmail.com> schrieb im 
Newsbeitrag news:difr8h$feb$1 at smc.vnet.net...
| Jens
|
| What do you mean?
|
| In the meanwhile I got some help from Wolfram 
support. So it works now.
| C++
| void Test123(double x[], int size, double 
result[])
| {
|      for (long i = 0 ; i < size; i ++) result[i] 
= 100.;
| }
| Notebook
| TEST123 = DefineDLLFunction["Test123", 
strFilename, "Void",
| {"double[]", "long", "double[]"}];
|
| input1=MakeNETObject[{1., 2., 3.}];
| res=MakeNETObject[{0.0,0.0, 0.0}];
|
| TEST123[input1, 3, res]
|
| NETObjectToExpression[res]
| {100.,100.,100.}
|
| Then I tried to so the same with 1 mio numbers 
and can see that the
| perfmance is really slow in the MakeNETObject 
and NETObjectToExpression
| parts. So the NETLink does not solve my problem 
since it still has
| performance problems... except of I can do this 
part better somehow.
|
| Regards
| Lars Schouw
| Tokyo, Japan
| 



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