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MathGroup Archive 2007

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Re: Dll problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73823] Re: Dll problem
  • From: "johanes" <lukas.tomsu at seznam.cz>
  • Date: Thu, 1 Mar 2007 06:17:46 -0500 (EST)
  • References: <er3h7r$f6i$1@smc.vnet.net>

Problem solved:

declaration of function

DYNMODELTRIM_DLLMAPPING double GetWeight();

had to be changed to

extern "C" DYNMODELTRIM_DLLMAPPING double GetWeight();





johanes napsal:
> Hi, i'm trying to connect a dll file to Mathematica 5.2. I was able to
> get the examples (found in HELP) to work, so there shouln't be
> anything wrong with .Net version.
>
> exapmle:
>
> In[5]:=
> novaFce=DefineDLLFunction["GetWeight","C:\HGS
> \libDynModelTrim.dll","double",{}]
>
> Out[5]=
> Function[Null,If[NETLink`DLL`Private`checkArgCount[GetWeight,{##1},0],
> Wolfram`NETLink`DynamicDLLNamespace`DLLWrapper2`GetWeight[##1],
> $Failed],{HoldAll}]
>
> after
>
> In[6]:=
> novaFce[]
>
> i got this error message
>
> >From In[6]:=
> NET::netexcptn: A .NET exception occurred:
> System.EntryPointNotFoundException: Unable to find an entry point
> named
> 'GetWeight' in DLL 'C:\HGS\libDynModelTrim.dll'.
>    at Wolfram.NETLink.DynamicDLLNamespace.DLLWrapper2.GetWeight().
>
> Out[6]=
> $Failed
>
>
>
> function GetWeight() is declared as:
>
>
> DYNMODELTRIM_DLLMAPPING double GetWeight();
>
>
> where DYNMODELTRIM_DLLMAPPING is defined:
>
> > if defined(LIBDYNMODELTRIM_EXPORTS)
> > #     define DYNMODELTRIM_DLLMAPPING  __declspec(dllexport)
> > #  else
> > #     define DYNMODELTRIM_DLLMAPPING  __declspec(dllimport)
> > #  endif
>
>
> could DYNMODELTRIM_DLLMAPPING be source if this problem?



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