Re: [Swig-user] Wrapping to C#, pointers, double pointers as argument output

[William S F. <ws...@fu...>]

Arnleif Bjørstad wrote:
> Hi
> 
>  
> 
> Using MS Visual Studio 2008, I have set up a solution project like those 
> in Swig examples for C#. My test application loads the dll, but so far I 
> only can get the application to report its version number, that is 
> returning an integer.
> 
>  
> 
> I understand that I need to do some extra work because SWIG cant know 
> what is input, output, or both input/output.
> 
>  
> 
> One example is:
> 
>  
> 
> short LC_OpenSos(const char *fil,short sModus,short sNyIdx,short 
> sVisStatus,LC_FILADM **ppFil, short *o_stat);
> 
>  
> 
> It is the last 2 arguments that gives me trouble.  They are both 
> out-parameters.
> 
>  
> 
> LC_FILADM **ppFil (pointer to a struct)
> 
> short *o_stat
> 
>  
> 
> Reading about typemaps and looking into the typemaps.i file I have tried 
> to correctly wrap the pointer “o_stat”.
> 
> In a preliminary test I did add a proxy function to the c++ program to 
> reduse the pointer **ppFil to *pFil and the interface file looks like this:
> 
>  
> 
> /* File : Fyba.i */
> 
> %module FybaSharpTest
> 
>  
> 
> %{
> 
> #include "fyba.h"
> 
> #include "stdafx.h"
> 
> #include "Prox.h"
> 
> %}
> 
>                                     
> 
> %include "fyba.h"
> 
> %include "Prox.h"
> 
>  
> 
> // %ignore LC_OpenSos(const char *fil,short sModus,short sNyIdx,short 
> sVisStatus,LC_FILADM **ppFil, short *o_stat);
> 
>  
> 
> %include "typemaps.i"
> 
>         %apply short *INOUT { short *o_stat };
> 
> short LC_OpenSos2(const char *fil,short sModus,short sNyIdx,short 
> sVisStatus,LC_FILADM *ppFil, short *o_stat);
> 
>  
> 
>  
> 
>  
> 
> I would appreciate if anyone could helpe me with good examples, wrapping 
> to C#.
> 
> I have searched the internet, but cant finde much useful examples.
> 

The short *o_stat should work given the code you have above. What is the 
problem?

For the LC_FILADM**, take a look at
http://www.swig.org/Doc2.0/Java.html#Java_struct_pointer_pointer

and convert the typemaps for C# usage using the info in 
http://www.swig.org/Doc2.0/CSharp.html#CSharp_differences_java

William