Question

I am trying to get a simple project working with FFTW in Visual Studio 2010. I am having trouble linking the library.

I’ve created 64 bit .lib files as directed on their Windows page

I unzipped the 64 bit version of their download and ran the specified tools in that directory. I’ve unzipped it in a folder called “fftw” as a sibling of my project.

In Visual Studio I’ve created a C++ Console App with all the defaults. The default build type is Debug Win32. I’ve added this line to Configuration Properties→Linker:
C:\Users\XXXXX\Documents\Visual Studio 2010\Projects\fftw\libfftw3-3.lib

I’ve also added libfftw3-3.lib to Configuration Properties→Linker→Input and tried a full path there.

I include StdLib complex and FFTW:

#include <complex>
#include "..\..\fftw\fftw3.h"

My main function just has their example code:

int _tmain(int argc, _TCHAR* argv[])
{
  const int N = 1024;
  fftw_complex in[N], out[N];
  fftw_plan p;
  p = fftw_create_plan(N, FFTW_FORWARD, FFTW_ESTIMATE);
  fftw_one(p, in, out);
  fftw_destroy_plan(p);  
  return 0;
}

When I try to build I get this:

1>------ Build started: Project: FFTTest, Configuration: Debug Win32 ------
1>  FFTTest.cpp
1>c:\users\XXXXX\documents\visual studio 2010\projects\ffttest\ffttest\ffttest.cpp(34): error C3861: 'fftw_create_plan': identifier not found
1>c:\users\XXXXX\documents\visual studio 2010\projects\ffttest\ffttest\ffttest.cpp(36): error C3861: 'fftw_one': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Can someone show me the error in my ways?

Answer 1

Found it: fftw_create_plan() and fftw_one() are functions that have been removed from FFTW3.

You might have got the code from FFTW2 tutorial, see the FFTW3 tutorial instead.