CODEWITHSUNDEEP
qtopencv
Andy
Andy

Reputation: 337

OpenCV 2.4.6 with QT 5.1.0 Errors

I am trying to get OpenCv2.4.6 to work with QT5.1.0 I've followed this Guide so far Qt creator 5.0.1 with OpenCv 2.3.4 on windows

Unfortunatly after finishing trying out the sample Application(Display an Image using OpenCv in the QtCreator I get these Errors:

[Project-Path]\main.o:-1: In function `main':
[Project-Path]\main.cpp:8: error: undefined reference to `cv::imread(std::string const&, int)'
[Project-Path]\main.cpp:9: error: undefined reference to `cv::namedWindow(std::string const&, int)'
[Project-Path]\main.cpp:10: error: undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
[Project-Path]\main.cpp:10: error: undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
[Project-Path]\main.cpp:11: error: undefined reference to `cv::waitKey(int)'
[Project Build Path Desktop Debug]\debug\main.o:-1: In function `ZN2cv3MatD1Ev':
   [OpenCV/Install/include]\opencv2\core\mat.hpp:278: error: undefined reference to `cv::fastFree(void*)'
[Project Build Path Desktop Debug]\debug\main.o:-1: In function `ZN2cv3Mat7releaseEv':
   [OpenCV/Install/include]\opencv2\core\mat.hpp:367: error: undefined reference to `cv::Mat::deallocate()'
collect2.exe:-1: error: error: ld returned 1 exit status

the "[]" Paths are my formatting and supposed to help keep track .

main.cpp

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>


using namespace cv;
int main() {
        // read an image
        Mat image = imread("img.jpg");
        namedWindow("My Image");
        imshow("My Image", image);
        waitKey(5000);

        return 1;
}

myFirstOpenCVProject.pro

QT       += core
QT       -= gui
TARGET = myFirstOpenCVProject
CONFIG   += console
CONFIG   -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
INCLUDEPATH += C:/qt/OpenCV246_bin/install/include
LIBS += -LC:/qt/OpenCV246_bin/install/lib/lopencv_core246.dll
LIBS += -LC:/qt/OpenCV246_bin/install/lib/lopencv_highgui246.dll
LIBS += -LC:/qt/OpenCV246_bin/install/lib/lopencv_imgproc246.dll
LIBS += -LC:/qt/OpenCV246_bin/install/lib/lopencv_features2d246.dll
LIBS += -LC:/qt/OpenCV246_bin/install/lib/lopencv_calib3d246.dll

Can you help me resolve this? I can't find any solutions that apply to my case ...

Upvotes: 0

Views: 3467

Answers (2)

Frank Osterfeld
Frank Osterfeld

Reputation: 25155

-L is to add directories to the search path. The actual libs are added via -l. The correct line would be:

LIBS += -LC:/qt/OpenCV246_bin/install/lib -llopencv_core246 -llopencv_highgui246 ...

Upvotes: 3

jamk
jamk

Reputation: 866

I think you are missing the static libs of opencv:

opencv_core246.lib
opencv_highgui246.lib
opencv_video246.lib
opencv_ml26d.lib
opencv_legacy246.lib
opencv_imgproc246.lib
opencv_whatever.lib

Don t know the pro commands very well. Maybe something like:

LIBS +=  -Lc:/blabla/opencv_imgproc246.lib

Upvotes: 0

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