--Directions for getting FFTW libraries on a Windows machine--
-- Marc Liberatore, CS Dept. UMass Amherst                  --

Note: These are specifically written for CodeBlocks and Visual Studio

Get CodeBlocks: http://www.codeblocks.org/downloads/binaries
Get the 32 bit FFTW library: http://www.fftw.org/install/windows.html
Get Microsoft Visual Studio

Extract the library into a folder named fftw, inside the Codeblocks folder.  
In my case, the path is: c:\\Program Files(x86)\CodeBlocks\fftw

Open the folder containing Visual Studio, then VC, and look for the lib folder.
In my case, it is \Program Files(x86)\Microsoft Visual Studio 10.0\VC\bin 
Copy this path.

Open the command line (Start Menu -> type  cmd  in the search box). 
Paste the path, and enclose it in quotation marks.  
Then add "vcvars32.bat" (or something like that) inside the parentheses.
Hit enter. This adds the right path to this instance of cmd's PATH to run the
lib.exe in the next step.
 
Still in the command window, type  cd "\Program Files(x86)\CodeBlocks\fftw" 
and hit enter.  Back at the fftw website, copy the three lines grouped 
together that begin with lib and paste into the command window.  Hit enter.

To add the dll's to the path: Open your control panel->system->advanced system settings->
environment variables(this is a button)->system variables (the lower part of the box)->path
and hit Edit.  Under variable value, there's a long string separated by semicolons. 
On the end of that string, type a semicolon ; then paste in the path to the fftw folder. 
In my case, I added   ;C:\\Program Files(x86)\CodeBlocks\fftw

Back in CodeBlocks, you have 2 choices:

1. To link fftw to just the project you're working on: go to Project->Build Options->
then click whatever your project name is

2. To link to globally: Settings->Compiler&Debugger

For either way after the above steps, go to Linker Settings->Add(this is a dialog box)
and add the 3 .lib files from the fftw folder that you made with Visual Studio Now you
should have 3 lines in "Link libraries".

Next, in the search directories tab->compiler tab->add (opens dialog box) add the fftw
folder.  Back to the search directories tab->linker tab->add(opens dialog box) add the 
fftw folder.

Congratulations, you can now compile and run programs involving FFTW!