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POUsing FFTWLib (C#): Using fftw.dft_r2c_2d() crashes vshost.exe, or main program if vshost is not running
 

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  1. POUsing FFTWLib (C#): Using fftw.dft_r2c_2d() crashes vshost.exe, or main program if vshost is not running
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    <p>As the title states: I'm trying to use Tamas Szalay's <a href="http://www.sdss.jhu.edu/~tamas/bytes/fftwcsharp.html" rel="nofollow noreferrer">C# port of FFTW</a> in Visual C# 2010 Professional (Trial), and I'm getting the above error when I try to use a two-dimensional transform. (The problem persists when I switch to dft_c2r_2d()). Other functions (in particular, fftw.malloc()) work fine.</p> <p>Details:</p> <pre><code>unsafe void FFTFind(IntPtr Scan0, int stride, int width, int height, Rectangle roi) { IntPtr ComplexImage = fftw.malloc(width * height * 16); double[] pComplexImage = new double[width * height * 2]; byte* pScan0 = (byte*)Scan0.ToPointer(); Console.WriteLine("3"); for (int y = 0; y &lt; height; y++) { for (int x = 0; x &lt; width; x++) { pComplexImage[x * y * 2] = pScan0[y * stride + x * 4]; //pComplexImage[x * y * 2] = pScan0[y * stride + x]; } } Console.WriteLine("3.05"); Marshal.Copy(pComplexImage, 0, ComplexImage, width * height * 2); Console.WriteLine("Starting FFTFind"); FFTFindKernel(ComplexImage, stride, width, height, roi); } unsafe void FFTFindKernel(IntPtr imageIn, int stride, int width, int height, Rectangle roi) { Console.WriteLine("3.1"); IntPtr hScan0 = (IntPtr) GCHandle.Alloc(imageIn, GCHandleType.Pinned); Console.WriteLine("3.3"); IntPtr FourierPlan; Console.WriteLine("3.5"); int start = System.Environment.TickCount; Console.WriteLine("3.7"); FourierPlan = fftw.dft_r2c_2d(width, height, hScan0, hScan0, 0); Console.WriteLine("4"); fftw.execute(FourierPlan); Console.WriteLine("Time: {0} ms", (System.Environment.TickCount - start)); } </code></pre> <p>The console prints up to "3.7". Attempting to run <code>FourierPlan = ...</code> causes the program to crash and a message box to pop-up: </p> <pre><code>vshost.exe has stopped working. </code></pre> <p>Disabling the Visual Studio host process only replaces "vshost.exe" with "FFTFind".</p> <p>Possibly relevant: I'm running this in an x64 environment (Windows Server Standard), but the dlls and programs are x86. This <a href="https://stackoverflow.com/questions/9170885/using-fftwlib-c-cannot-find-libfftw3-3-dll">previously caused a problem in Visual C# 2010 Express</a>, which was solved by switching to the Professional Trial and then manually changing the Configuration Target from "x86" to "Any CPU."</p> <p>UPDATE: Running the provided test code works fine.</p>
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    1. COIt seems you've found a bug in either your pinvoke to the native method or you've hit a bug in the native code. You didn't post either so how can we help?
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    2. COI didn't write either - the code is linked in the post, Tamas Szaley's C# port. I'll send off an email about it if you think that's appropriate, but as this is kind of time-sensitive I'd appreciate the assistance.
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    3. CO(Oh, and Szaley published his source and has no limits on usage, so if you're willing to go that far there's that option. I'm afraid I'm not really familiar enough with the libraries to know what to copy, but if you give me instructions I can blindly follow directions.)
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