Using external dll in Qt [OpenCV]

[danioto]

OpenCV DLL's are placed only in PATH environment variable, I mean:

C:\Programs\OpenCV-2.4.2\mybuildmingw\install\bin

C:\Programs\OpenCV-2.4.2\mybuildmingw\install\bin

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I added this line too:

C:\Programs\OpenCV-2.4.2\mybuildmingw\install\lib

C:\Programs\OpenCV-2.4.2\mybuildmingw\install\lib

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Where "mybuildmingw" is folder with complied OpenCV files with MinGW.

And in *.pro file I have:

INCLUDEPATH += C:/Programy/OpenCV-2.4.2/mybuildmingw/install/include
 
LIBS += -LC:/Programy/OpenCV-2.4.2/mybuildmingw/install/bin -llibopencv_highgui242
LIBS += -LC:/Programy/OpenCV-2.4.2/mybuildmingw/install/lib -llibopencv_highgui242

INCLUDEPATH += C:/Programy/OpenCV-2.4.2/mybuildmingw/install/include

LIBS += -LC:/Programy/OpenCV-2.4.2/mybuildmingw/install/bin -llibopencv_highgui242
LIBS += -LC:/Programy/OpenCV-2.4.2/mybuildmingw/install/lib -llibopencv_highgui242

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So, that was what are you talking about?

================================================== =========================
EDIT:
I've solved the problem, but it's the most weirdest thing I've ever meet in programming... I have nothing connected with OpenCV in PATH environment variable and my *.pro file is:

INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include
INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include/opencv
 
LIBS += -LC:/Programs/OpenCV-2.4.2/mybuild/lib/Debug -lopencv_highgui242d \
                                                     -lopencv_core242d

INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include
INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include/opencv

LIBS += -LC:/Programs/OpenCV-2.4.2/mybuild/lib/Debug -lopencv_highgui242d \
                                                     -lopencv_core242d

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So: "mybuildmingw" is folder with compiled OpenCV files with MinGW and "mybuild" is folder with compiled OpenCV files with MVSC+... Include files Qt takes from MinGW build and lib's from MVSC+ build. It's so weird, but it's working!

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
...
IplImage* img = cvLoadImage( "C:\\opencv.png" );
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage("Example1", img);
cvWaitKey(0);

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
...
IplImage* img = cvLoadImage( "C:\\opencv.png" );
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage("Example1", img);
cvWaitKey(0);

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================================================== =========================
EDIT2:

It's not so simple as I thought. I have another linker problem:

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
...
IplImage* img = cvLoadImage( "C:\\opencv.png" );
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage("Example1", img);
cvWaitKey(0);
 
cv::VideoCapture capture(0);

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
...
IplImage* img = cvLoadImage( "C:\\opencv.png" );
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage("Example1", img);
cvWaitKey(0);

cv::VideoCapture capture(0);

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And *.pro:

INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include
INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include/opencv
 
LIBS += -LC:/Programs/OpenCV-2.4.2/mybuild/lib/Debug \
        -lopencv_calib3d242d            \
        -lopencv_contrib242d            \
        -lopencv_core242d               \
        -lopencv_features2d242d         \
        -lopencv_flann242d              \
        -lopencv_gpu242d                \
        -lopencv_haartraining_engined   \
        -lopencv_highgui242d            \
        -lopencv_imgproc242d            \
        -lopencv_legacy242d             \
        -lopencv_ml242d                 \
        -lopencv_nonfree242d            \
        -lopencv_objdetect242d          \
        -lopencv_photo242d              \
        -lopencv_stitching242d          \
        -lopencv_ts242d                 \
        -lopencv_video242d              \
        -lopencv_videostab242d

INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include
INCLUDEPATH += C:/Programs/OpenCV-2.4.2/mybuildmingw/install/include/opencv

LIBS += -LC:/Programs/OpenCV-2.4.2/mybuild/lib/Debug \
        -lopencv_calib3d242d            \
        -lopencv_contrib242d            \
        -lopencv_core242d               \
        -lopencv_features2d242d         \
        -lopencv_flann242d              \
        -lopencv_gpu242d                \
        -lopencv_haartraining_engined   \
        -lopencv_highgui242d            \
        -lopencv_imgproc242d            \
        -lopencv_legacy242d             \
        -lopencv_ml242d                 \
        -lopencv_nonfree242d            \
        -lopencv_objdetect242d          \
        -lopencv_photo242d              \
        -lopencv_stitching242d          \
        -lopencv_ts242d                 \
        -lopencv_video242d              \
        -lopencv_videostab242d

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And error occurs:

(...) undefined reference to `cv::VideoCapture::VideoCapture(int)'
(...) undefined reference to `cv::VideoCapture::~VideoCapture()'
collect2: ld returned 1 exit status

(...) undefined reference to `cv::VideoCapture::VideoCapture(int)'
(...) undefined reference to `cv::VideoCapture::~VideoCapture()'
collect2: ld returned 1 exit status

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Any ideas?