Problem building mex files

[JosePizarro]

Hi. I openCV2.4.9 installed in D:\OpenCV directory. The command I used was the following:

mex generateEllipseCandidates.cpp -ID:\OpenCV\opencv\build\include -ID:\OpenCV\opencv\build\include\opencv -ID:\OpenCV\opencv\build\include\opencv2 -LD:\OpenCV\opencv\build\x64\vc11\lib -LC:\Program Files\MATLAB\R2018b\extern\include -LC:\Program Files\MATLAB\R2018b\extern\lib\win64\microsoft -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.libmex

but I'm getting this error:
Error using mex
C:\High-quality-ellipse-detection-master\Files\MATLAB\R2018b\extern\include not found; check that you are in the correct
current folder, and check the spelling of 'C:\High-quality-ellipse-detection-master\Files\MATLAB\R2018b\extern\include'.

[AlanLuSun]

Hi, I guess that the command you entered might not correct. The true one is as follow:

mex generateEllipseCandidates.cpp -ID:\OpenCV\opencv\build\include -ID:\OpenCV\opencv\build\include\opencv -ID:\OpenCV\opencv\build\include\opencv2 -LD:\OpenCV\opencv\build\x64\vc11\lib -LC:\Program Files\MATLAB\R2018b\extern\include -LC:\Program Files\MATLAB\R2018b\extern\lib\win64\microsoft -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

Please try again.

[JosePizarro]

Still not working. For a reason mex is looking for a folder "Files" inside the project folder

[AlanLuSun]

Ok, please check whether each folder containing the corresponding lib files. For example, it should have lib file "opencv_core249" in the folder "D:\OpenCV\opencv\build\x64\vc11\lib" and should have "libmwlapack.lib" in the "C:\Program Files\MATLAB\R2018b\extern\lib\win64\microsoft". In addition, please check whether each entered path exists or not.

[AlanLuSun]

And the current working directory of MATLAB should also be same as the directory of source code.

[JosePizarro]

Thanks for your reply but the problem still persist. I've checked the libraries path and everything is ok. Maybe is my matlab version. I'll try it in a different version

[AlanLuSun]

My MATLAB version is R2016b.

[Wuranker]

Do not forget to set the path in quotes if it contains spaces!
Please try:
mex generateEllipseCandidates.cpp -ID:\OpenCV\opencv\build\include -ID:\OpenCV\opencv\build\include\opencv -ID:\OpenCV\opencv\build\include\opencv2 -LD:\OpenCV\opencv\build\x64\vc11\lib -L'C:\Program Files\MATLAB\R2018b\extern\include' -L'C:\Program Files\MATLAB\R2018b\extern\lib\win64\microsoft' -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

[AlanLuSun]

@JosePizarro
Yes, it's suggested that the software path does not contain the blank space. Otherwise, it should use the quotation marks to enclose the entered path.
Thanks, @Wuranker

[justinner]

Hi. I openCV2.4.9 installed in C:\Users\Administrator\Desktop directory. The command I used was the following:

mex generateEllipseCandidates.cpp -IC:\Users\Administrator\Desktop\OpenCV\opencv2.4.9\build\include -IC:\Users\Administrator\Desktop\OpenCV\opencv2.4.9\build\include\opencv -LC:\Users\Administrator\Desktop\OpenCV\opencv2.4.9\build\x64\vc11\lib -L**'IC:\Program Files\MATLAB\MATLAB Runtime\v90\extern\include'** -L**'IC:\Program Files\MATLAB\MATLAB Runtime\v90\extern\lib\win64\microsoft'** -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

but I'm getting this error:
警告: MEX 找不到库 'opencv_core249'。将默认设置为 'libopencv_core249.lib'。
警告: MEX 找不到库 'opencv_highgui249'。将默认设置为 'libopencv_highgui249.lib'。
警告: MEX 找不到库 'opencv_imgproc249'。将默认设置为 'libopencv_imgproc249.lib'。
使用 'Microsoft Windows SDK 7.1 (C++)' 编译。
错误使用 mex
LINK : fatal error LNK1181: cannot open input file 'libopencv_core249.lib'

so could you give me some advice?

[AlanLuSun]

Hi, justiner. I guess your command may be incorrect. For example,

-L**'IC:\Program Files\MATLAB\MATLAB Runtime\v90\extern\include'** -L**'IC:\Program Files\MATLAB\MATLAB Runtime\v90\extern\lib\win64\microsoft'**

should be replaced by

-I'C:\Program Files\MATLAB\MATLAB Runtime\v90\extern\include' -L'C:\Program Files\MATLAB\MATLAB Runtime\v90\extern\lib\win64\microsoft'

Please read the instructions and answer #4 carefully.

[JosePizarro]

The problem has been solved! Thank you all!

[justinner]

Hi, justiner. I guess your command may be incorrect. For example,

-L**'IC:\Program Files\MATLAB\MATLAB Runtime\v90\extern\include'** -L**'IC:\Program Files\MATLAB\MATLAB Runtime\v90\extern\lib\win64\microsoft'**

should be replaced by

-I'C:\Program Files\MATLAB\MATLAB Runtime\v90\extern\include' -L'C:\Program Files\MATLAB\MATLAB Runtime\v90\extern\lib\win64\microsoft'

Please read the instructions and answer #4 carefully.

Thanks for your guide,Thank you very much !

[jaimeet64]

@justinner I believe that the problem is in the location of your MATLAB folder. mex is unable to access files from Program Files. Hence, for a simple hack I copied the MATLAB folder to C drive, provide a new location and you will be able to compile it successfully.

I ran the following command:

mex generateEllipseCandidates.cpp -IC:\opencv\build\include -IC:\opencv\build\include\opencv -IC:\opencv\build\include\opencv2 -LC:\opencv\build\x64\vc11\lib -IC:\Users\jaimeetp\Documents\MATLAB\R2019a\extern\include -LC:\Users\jaimeetp\Documents\MATLAB\R2019a\extern\lib\win64\microsoft -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

[dipu641298]

Hi I am getting this error can anyone tell me what is the issue ?

Error using mex
C:\opencv\build\x64\vc11\lib\opencv_core249.lib: error adding symbols: File in wrong format
collect2.exe: error: ld returned 1 exit status

I ran this command :

mex generateEllipseCandidates.cpp -IC:\opencv\build\include -IC:\opencv\build\include\opencv -IC:\opencv\build\include\opencv2 -LC:\opencv\build\x64\vc11\lib -I'C:\Program Files\Polyspace\R2019a\extern\include' -L'C:\Program Files\Polyspace\R2019a\extern\lib\win64\microsoft' -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

[FZ-Huang]

Hi, I guess that the command you entered might not correct. The true one is as follow:

mex generateEllipseCandidates.cpp -ID:\OpenCV\opencv\build\include -ID:\OpenCV\opencv\build\include\opencv -ID:\OpenCV\opencv\build\include\opencv2 -LD:\OpenCV\opencv\build\x64\vc11\lib -LC:\Program Files\MATLAB\R2018b\extern\include -LC:\Program Files\MATLAB\R2018b\extern\lib\win64\microsoft -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

Please try again.
Hi，when I compile the file "generateEllipseCandidates.cpp" in MATLAB on my computer to generate the mex file "generateEllipseCandidates.mexw64" with the following command:
mex generateEllipseCandidates.cpp -ID:\Sofaware\Opencv2.4.9\opencv\build\include -ID:\Sofaware\Opencv2.4.9\opencv\build\include\opencv -ID:\Sofaware\Opencv2.4.9\opencv\build\include\opencv2 -LD:\Sofaware\Opencv2.4.9\opencv\build\x64\vc11\lib -ID:\matlab2012b\extern\include -LD:\matlab2012b\extern\lib\win64\microsoft -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

There is an error as following:
generateEllipseCandidates.obj : error LNK2019: 无法解析的外部符号 dggev，该符号在函数 "int __cdecl fitEllipse(struct point2d *,int,double *)" (?fitEllipse@@YAHPEAUpoint2d@@hpean@Z) 中被引用
generateEllipseCandidates.mexw64 : fatal error LNK1120: 1 个无法解析的外部命令

So, can you give me some suggestions?