Cannot Integrate Opencv With Qt - qt

Question

I would like to integrate opencv249 with Qt 5.5. My .pro file is like that:
INCLUDEPATH += C:/OpenCV249/opencv/build/include
INCLUDEPATH += C:/OpenCV249/opencv/build/include/opencv
INCLUDEPATH += C:/OpenCV249/opencv/build/include/opencv2
LIBS += -LC:/OpenCV249/opencv/build/x86/vc12/lib
LIBS += -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -lopencv_features2d249 -lopencv_calib3d249
My code is like that:
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"
using namespace cv;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Mat im=imread("1.jpg");
imshow("kubi",im);
return a.exec();
}
It gives those errors:
main.obj:-1: error: LNK2019: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?fastFree#cv##YAXPEAX#Z) referenced in function "public: __cdecl cv::Mat::~Mat(void)" (??1Mat#cv##QEAA#XZ)
main.obj:-1: error: LNK2019: unresolved external symbol "public: __cdecl cv::_InputArray::_InputArray(class cv::Mat const &)" (??0_InputArray#cv##QEAA#AEBVMat#1##Z) referenced in function main
main.obj:-1: error: LNK2019: unresolved external symbol "public: void __cdecl cv::Mat::deallocate(void)" (?deallocate#Mat#cv##QEAAXXZ) referenced in function "public: void __cdecl cv::Mat::release(void)" (?release#Mat#cv##QEAAXXZ)
main.obj:-1: error: LNK2019: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd#cv##YAHPEAHH#Z) referenced in function "public: void __cdecl cv::Mat::release(void)" (?release#Mat#cv##QEAAXXZ)
main.obj:-1: error: LNK2019: unresolved external symbol "void __cdecl cv::imshow(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class cv::_InputArray const &)" (?imshow#cv##YAXAEBV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##AEBV_InputArray#1##Z) referenced in function main
main.obj:-1: error: LNK2019: unresolved external symbol "class cv::Mat __cdecl cv::imread(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (?imread#cv##YA?AVMat#1#AEBV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##H#Z) referenced in function main
debug\Sercan.exe:-1: error: LNK1120: 6 unresolved externals
I don't know how to fix it.

Answer 1

Is your lib path correct?
Should you change
LIBS += -LC:/opencv/build/x86/vc12/lib
with
LIBS += -LC:/OpenCV249/opencv/build/x86/vc12/lib
?
It's only a wild guess, everything else looks OK...