topic Problems linking with Intel MKL to create a FFT dll in Intel® oneAPI Math Kernel Library

Problems linking with Intel MKL to create a FFT dll

ionomolo — Thu, 01 May 2008 18:27:23 GMT

I have used Intel MKL to calculate the one-dimensional complex FFT from a set of data with no problems.

The program has a main function and a FFT function and both work. Now i have linked the FFT function as a dll to call it from C# and it hangs due to trying to read from a null pointer just at DftiCreateDescriptor(...).

MKL_Complex16* Dades = new MKL_Complex16;

MKL_LONG N2 = n;

DFTI_DESCRIPTOR_HANDLE my_desc1_handle;

long status;

for (int m=0;m

{

Dades.real = DadesReals;

Dades.imag = DadesCompl;

}

DftiCreateDescriptor( &my_desc1_handle, DFTI_DOUBLE,DFTI_COMPLEX, 1, N2);

status = DftiCommitDescriptor( my_desc1_handle );

status = DftiComputeForward(my_desc1_handle, Dades);

status = DftiFreeDescriptor(&my_desc1_handle);

for (int m=0;m

{

DadesReals = Dades.real;

DadesCompl = Dades.imag;

}

delete[] Dades;

I'm totally amazed at seeing the same code working when linked as executable and not working when linked as dll. I have tried both threaded and sequential layers.

Re: Problems linking with Intel MKL to create a FFT dll

Vladimir_Lunev — Sun, 04 May 2008 11:48:26 GMT

Hi!
What is a link line to create your FFT DLL?
Thanks,
-Vladimir

Hi, ionomolo

chu__xl — Mon, 05 Nov 2018 14:26:14 GMT

Hi, ionomolo

I meet a same issue with you. Do you solve this issue? Would you give me some suggestions?

Thanks!

Chu

Chu,

Gennady_F_Intel — Tue, 06 Nov 2018 03:52:58 GMT

Chu,

I'd recommend you to look at this KB artcile: https://software.intel.com/en-us/articles/using-intel-mkl-in-your-c-program

and check with MKL Linker Adviser how to properly link with Intel MKL - https://software.intel.com/en-us/articles/intel-mkl-link-line-advisor