QtCreator and OpenCV

Question

I managed to compile successfuly programs that use OpenCV with QtCreator but i have a problem with the dlls when i try to execute my application.

This is the error i get. The wierd thing is that i don't have this dll in my system. I tried to download it and place it in the same directory with the executable but i get the same error.

here is my .pro file

LIBS += -Lc:/Users/Libraries/OpenCV2.3/build/x86/mingw/bin/

LIBS += -lopencv_calib3d230 \
        -lopencv_contrib230\
        -lopencv_core230 \
        -lopencv_features2d230 \
        -lopencv_flann230 \
        -lopencv_gpu230 \
        -lopencv_highgui230 \
        -lopencv_imgproc230 \
        -lopencv_legacy230 \
        -lopencv_ml230 \
        -lopencv_objdetect230 \
        -lopencv_video230

INCLUDEPATH += c:/Users/Libraries/OpenCV2.3/build/include/

SOURCES += \
    main.cpp

Anyone that knows why this problem occurs?

Answer 1

I found what was going wrong. I compiled opencv again and changed my .pro file to link from that folder.

Linking with the opencv-superpack package that is provided for windows caused this problem.

I hope this will help others facing the same problem.

Answer 2

Did you try, instead of simply putting the dll in the folder to add it to the path of your system ?

On win XP it's something like: Configuration Panel > System > Advanced > Paths

Answer 3

Downloading a versioned DLL probably won't work. libstdc++-6.dll should be in the bin directory of your MinGW installation (which was probably included with QtCreator, check there).

You must distribute this dll with your app (or link with -static ) or at least add its directory to PATH.