Re: External C DLL crashes Octave

[Tatsuro MATSUOKA]

Hello

Please show the version of octave and whether it is MSVC version or MinGW 
Version.

Regards

Tatsuro
--- mishrapiyush wrote:

> 
> Hi all,
> 
>   I followed the example on wiki
> (http://wiki.octave.org/wiki.pl?OctaveLinkToWindowsDLLs) to compile my c/c++
> code into an .oct file but when I try to call this function, octave crashes.
> A snippet of my codes is attached below for your reference.
> 
> I had compiled mycode.cpp as Win DLL using MS Visual Studio 2008 and tested
> it on Matlab. Next I had copied the mycode.dll and mycode.lib into my Octave
> project folder and compiled them with mycodewrapper.cc to generate
> func1.oct, which I call in a matlab function.
> 
> I have recetly started using Octave and have spent hours researching the
> process of integrating external function calls. In my opinion, the manual
> (Appendix A.1.9) does not do a good job of explaining C/C++ integration and
> should be supplemented with wiki entry mentioned above, which itself misses
> to mention that when linking the wrapper with external code, it should be
> done with .lib file and not the .dll file. I would very much appreciate any
> help in further resolving this problem. Thanks for your time.
> 
> ----------------------------dllmain.cpp------------------------------
> #include "stdafx.h"
> 
> BOOL APIENTRY DllMain( HMODULE hModule, DWORD  ul_reason_for_call, LPVOID
> lpReserved ) {
>       switch (ul_reason_for_call)
>       {
>       case DLL_PROCESS_ATTACH:
>       case DLL_THREAD_ATTACH:
>       case DLL_THREAD_DETACH:
>       case DLL_PROCESS_DETACH:
>               break;
>       }
>       return TRUE;
> }
> ----------------------------mycode.cpp------------------------------
> #include <stdio.h>
> #include <stdlib.h>
> 
> extern "C" unsigned int func1(double *x);
> 
> unsigned int func1(double *x)
> {
>     ...
> }
> ----------------------------mycodewrapper.cc------------------------------
>   #include <octave/oct.h>
>   
>   extern "C" {
>               unsigned int func1(double *x);
>   }
>   DEFUN_DLD (func1, args, , "usage func1('double')" ) {
>      octave_value_list retval;
>      Matrix B = args(0).matrix_value();
>      double* A;
>       *A = B.data(0);
>       retval(0) = (double) func1( A );
>       return retval;
>   }
> 
> -- 
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> http://www.nabble.com/External-C-DLL-crashes-Octave-tp25189231p25189231.html
> Sent from the Octave - General mailing list archive at Nabble.com.
> 
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