first example code error

federiko00
36 ●1 ●1 ●5

berak
32993 ●7 ●81 ●312

hi all i've installed opencv version 3 from github....but when i try to do the first example code using Eclipse ( the code line way works well) i obtain this error and i don't know what to do. Thank you for your help

18:42:03 * Incremental Build of configuration Debug for project DI * make all Building file: ../src/DI.cpp Invoking: GCC C++ Compiler g++ -I/usr/local/include/opencv -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/DI.d" -MT"src/DI.d" -o "src/DI.o" "../src/DI.cpp" Finished building: ../src/DI.cpp

Building target: DI Invoking: GCC C++ Linker g++ -L/usr/local/lib -o "DI" ./src/DI.o -lopencv_core -lopencv_imgproc -lopencv_highgui /usr/bin/ld: ./src/DI.o: undefined reference to symbol '_ZN2cv6imreadERKNS_6StringEi' //usr/local/lib/libopencv_imgcodecs.so.3.0: error adding symbols: DSO missing from command line collect2: error: ld returned 1 exit status make: * [DI] Errore 1

18:42:03 Build Finished (took 763ms)

Comments

I don't know how to solve this in particular, but I think these problems can be avoided if you follow these tutorials:

This worked for a lot of people, I hope this help you.

Rodrigo Berriel (Nov 7 '14)edit

i exactly followed tutorials on opencv doc for opencv 3.0 and i get this problem

federiko00 (Nov 10 '14)edit

just to say: those tutorials I recommended have the same recomendation @berak did

Rodrigo Berriel (Nov 13 '14)edit

@Mohsen Shafaghi

please do not post answers here, if you have a question or a comment, thank you.

(and no, this is not how this site works, noone will send you anything per mail, please do not expect anything like this)

berak (Apr 17 '19)edit

add a comment

answered Nov 9 '14

berak
32993 ●7 ●81 ●312

updated Nov 9 '14

imread/imwrite and friends were moved from highgui to a new imgcodecs module.

so you will have to

#include "opencv2/imgcodecs.hpp"

and link

-lopencv_imgcodecs

btw, include path should be:

-I/usr/local/include

not

-I/usr/local/include/opencv

Comments

perfect! this works! i would be useful if these correction steps were added to the official opencv 3.0 pages tutorial!

federiko00 (Nov 10 '14)edit

frederiko00 , if you could point out errors/misleading parts in the tutorials, that would be definitely helpful to others !

berak (Nov 10 '14)edit

Really Great!!!Thanks for the answer;solved my issue too.As I am a beginner I was unaware of these changes.

Blue_Gene (May 1 '15)edit

Thanks, This Worked perfectly for me

vikrammeena (Dec 29 '15)edit

So, am I reading this correctly? 18 months ago this problem and solution was posted. To date the tutorial has _still_ not been edited to reflect these updates. It makes it hard for us to convince the "pointy-haired boss" that linux/openCV is the proper approach when he gets error after error when following the tutorials verbatim.

TyWebb (May 15 '16)edit

One year later and I just desperately copy pasted this very obscure error message into google, ended up here and lo and behold, the solution was right here. Thank you so much! A bit daunting when you try to learn something new and I end up spending hours discerning outdated installation instructions. Thanks again for the help!

MC Squidzy (Jul 17 '17)edit

@MC Squidzy spammer?

LBerger (Jul 17 '17)edit

@LBerger, unsure.

berak (Jul 17 '17)edit

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