error C2440 While using MATLAB Coder with Custom FFT library callback

Question

Murali Kannan Thiraviam 2017-12-6

0
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https://ww2.mathworks.cn/matlabcentral/answers/371393-error-c2440-while-using-matlab-coder-with-custom-fft-library-callback

回答： Ryan Livingston 2017-12-19

I have simple script function [RetVal] = MatLabFFTW(CapWave) TempVal = fft(CapWave); RetVal = real(sum(TempVal)); end

When I tried to convert this script to DLL using Coder; I got following compilation errors:

Script\codegen\dll\MatLabFFTW\MatLabFFTW.cpp(102) : error C2440: '=' : cannot convert from 'void ' to 'double *' Conversion from 'void' to pointer to non-'void' requires an explicit cast Script\codegen\dll\MatLabFFTW\MatLabFFTW.cpp(110) : error C2440: '=' : cannot convert from 'void ' to 'fftw_complex (*)' Conversion from 'void' to pointer to non-'void' requires an explicit cast Script\codegen\dll\MatLabFFTW\MatLabFFTW.cpp(111) : error C2664: 'void fftw_execute_dft_r2c(const fftw_plan,double ,fftw_complex (*))' : cannot convert argument 1 from 'void *' to 'const fftw_plan' Conversion from 'void' to pointer to non-'void' requires an explicit cast Script\codegen\dll\MatLabFFTW\MatLabFFTW.cpp(146) : error C2440: '=' : cannot convert from 'void ' to 'double *' Conversion from 'void' to pointer to non-'void' requires an explicit cast Script\codegen\dll\MatLabFFTW\MatLabFFTW.cpp(147) : error C2440: '=' : cannot convert from 'void ' to 'fftw_complex (*)' Conversion from 'void' to pointer to non-'void' requires an explicit cast Script\codegen\dll\MatLabFFTW\MatLabFFTW.cpp(189) : error C2664: 'void fftw_destroy_plan(fftw_plan)' : cannot convert argument 1 from 'void ' to 'fftw_plan' Conversion from 'void' to pointer to non-'void' requires an explicit cast

Note: 1) I am using the Custom FFT library callback option to use our own FFTW 2) When select the language as 'C' then there is no problem in compiling the DLL but choosing C++ giving this compiler error 3) I am using Visual Studio 2013 compiler

Please help me to solve this issue.