问题
I'm having trouble trying to implement fftw3 with openCV in the same project. I'm new to c/c++ and any help will be much appreciated. The following is just a sample code i used:
#include "fftw3.h"
#include <stdlib.h>
int main(){
fftw_complex *in, *out;
fftw_plan p;
int N=8;
in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N);
out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N);
p = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
for(int i=0; i<N; i++){
in[i][0]=i;
in[i][1]=0;
}
fftw_execute(p);
for(int i=0; i<N; i++){
printf("R->%f\tI->%f\n", out[i][0], out[i][1]);
}
system("pause");
fftw_destroy_plan(p);
fftw_free(in); fftw_free(out);
}
The code is compiling fine when its in its own project. But when I'm trying to link the fftw3 and openCV together i get a linker error:
1>video.obj : error LNK2001: unresolved external symbol _fftw_destroy_plan
1>video.obj : error LNK2001: unresolved external symbol _fftw_execute
1>video.obj : error LNK2001: unresolved external symbol _fftw_plan_dft_2d
1>video.obj : error LNK2001: unresolved external symbol _fftw_malloc
1>video.obj : error LNK2001: unresolved external symbol _fftw_free
1>D:\C WorkSpace\Viedo_CV\Video test\Release\Video test.exe : fatal error LNK1120: 5 unresolved externals
1>
1>Build FAILED.
I double checked all the linker configurations and they seem to be fine(as i said all is working well when in a separate projects). The openCV library is working fine. Unfortunately I can't post my real code. All the openCV i use is in:
#include <opencv\\cv.h>
#include <opencv\\highgui.h>
#include <windows.h>
Any help will be much appreciated.
回答1:
I got it figured out, when I installed openCV I created an environmental variable to the openCV build location and added the openCV DLL's location to the Path variable. What i didn't notice is that I added the x86 version of the DLL's to the Path variable and my project was setup as x64, the reason it worked in another project is because I copied the x64 DLL's to the project folder it self. All worked fine after I edited the Path to the correct x64 DLL's location.
来源:https://stackoverflow.com/questions/17001780/linker-error-using-opencv-with-fftw3-visual-studio-2010