vilaemail wrote:
>
>>
>>Well, both.  The three dots in the path probably doesn't help.  I seem
to
>>recall that being a shortcut in '95 or something, but...
>>
>>Probably no easy fix.  That's not even a supported language, nevermind
>the
>>compiler/OS.  Search for (or write) a wrapper (bindings) of some sort. 
>My
>>guess is people who care enough to use FFTW couldn't be bothered with
>>something like .NET, though there's all types of people...
>>
>>
>
>The dots were placed by me. In message box I get good absolute path.

Ok, if it works for you.


>Well then do suggest me any other language (in witch I could make all FFT
>functions and create a .dll or .exe that will later be callable by
vb.net).

Search the web for how to call native (unmanaged) C code from your language
of choice.  I have no idea how to write a .NET assembly (nor would I want
to), and I've never had to write a COM component, though I'd consider doing
so if need be.  You have 2 requirements:

1) write your wrapper in a language/environment that can call FFTW (such as
MSVC, though don't try to compile FFTW itself in there)

2) expose one of the two interfaces that VB.NET wants.  I'm not sure if COM
can even do it, but *if* it can, MFC or ATL might simplify some aspects.

Please do some searching before writing back.  Again, this whole mess seems
to be a very roundabout way of doing things, and you may be better off in
this situation understanding AND translating Vlad's code instead of using
FFTW, assuming a power of two is ok with you.

>
>Well, both.  The three dots in the path probably doesn't help.  I seem to
>recall that being a shortcut in '95 or something, but...
>
>Probably no easy fix.  That's not even a supported language, nevermind
the
>compiler/OS.  Search for (or write) a wrapper (bindings) of some sort. 
My
>guess is people who care enough to use FFTW couldn't be bothered with
>something like .NET, though there's all types of people...
>
>

The dots were placed by me. In message box I get good absolute path.

Well then do suggest me any other language (in witch I could make all FFT
functions and create a .dll or .exe that will later be callable by vb.net).

vilaemail wrote:
>I don't know where to post this (since FFTW developers do not provide
help
>with VB, and posting on MSDN for non-VB related question is kinda dumb) 

No surprise there.  I doubt they'd help with MSVC even, and C's at least a
sane language.


>I really can't import FFTW library in VB.NET 9 (VS 2008). When trying to
>reference to it i get this error message:
>
>A reference to '...\libfftw3-3.dll' could not be added. Please make sure
>that the file is accessible, and that it is a valid assembly or COM
>component.
>
>My guess is that file is not "a valid assembly or COM component". How to
>fix this. Thanks for any help.


Well, both.  The three dots in the path probably doesn't help.  I seem to
recall that being a shortcut in '95 or something, but...

Probably no easy fix.  That's not even a supported language, nevermind the
compiler/OS.  Search for (or write) a wrapper (bindings) of some sort.  My
guess is people who care enough to use FFTW couldn't be bothered with
something like .NET, though there's all types of people...

Vladimir Vassilevsky wrote:
>  e=1u<<(order-l+1);

Is that correct?

Cristiano 

vilaemail wrote:

> Hi,
> 
> I don't know where to post this (since FFTW developers do not provide help
> with VB, and posting on MSDN for non-VB related question is kinda dumb) so
> I decided to ask you guys. :)
> 
> I really can't import FFTW library in VB.NET 9 (VS 2008). When trying to
> reference to it i get this error message:
> 
> A reference to '...\libfftw3-3.dll' could not be added. Please make sure
> that the file is accessible, and that it is a valid assembly or COM
> component.
> 
> My guess is that file is not "a valid assembly or COM component". How to
> fix this. Thanks for any help.

Do you really need FFTW ?
Would simple straightforward FFT work for you?


#include <math.h>


#if !defined M_PI
#define M_PI        3.14159265359
#endif


void fft(float *x,float *y,int order,int param)

{
  unsigned int n,l,e,f,i,j,o,o1,j1,i1,k;
  float u,v,z,c,s,p,q,r,t,w,a;


  n=1u<<order;


  for(l=1;l<=order;l++)
  {

  u=1.0;
  v=0.0;
  e=1u<<(order-l+1);
  f=e/2;

  z=M_PI/f;

  c=cos(z);
  s=sin(z);

  if(param==FFT) s=-s;

  for(j=1;j<=f;j++)
   {
   for(i=j;i<=n;i+=e)
    {
    o=i+f-1;
    o1=i-1;
    p=x[o1]+x[o];
    r=x[o1]-x[o];
    q=y[o1]+y[o];
    t=y[o1]-y[o];
    x[o]=r*u-t*v;
    y[o]=t*u+r*v;
    x[o1]=p;
    y[o1]=q;
    }
   w=u*c-v*s;
   v=v*c+u*s;
   u=w;
   }
  }


  j=1;

  for(i=1;i<n;i++)
   {
   if(i<j)
    {
    j1=j-1;
    i1=i-1;
    p=x[j1];
    q=y[j1];
    x[j1]=x[i1];
    y[j1]=y[i1];
    x[i1]=p;
    y[i1]=q;
    }

   k=n/2;

   while(k<j)
    {
    j=j-k;
    k=k/2;
    }

   j+=k;
   }

  if(param==FFT) return;

  a=1.0/n;
  for(k=0;k<n;k++)
   {
   x[k]*=a;
   y[k]*=a;
   }
   return;
}

Hi,

I don't know where to post this (since FFTW developers do not provide help
with VB, and posting on MSDN for non-VB related question is kinda dumb) so
I decided to ask you guys. :)

I really can't import FFTW library in VB.NET 9 (VS 2008). When trying to
reference to it i get this error message:

A reference to '...\libfftw3-3.dll' could not be added. Please make sure
that the file is accessible, and that it is a valid assembly or COM
component.

My guess is that file is not "a valid assembly or COM component". How to
fix this. Thanks for any help.

Sincerely,
Filip.