OpenCV with Qt: The program has unexpectedly finished - c++

Question

I am trying to configure OpenCV with Qt Creator 2.7.0 (Qt 5.0.2) on windows 8 64bit.
While executing my program, I get the following error:
The program has unexpectedly finished.
This is my main.cpp
#include "mainwindow.h"
#include <QApplication>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
IplImage *image = cvLoadImage("E:\\lena.jpg"); //If this is removed, the program runs OK
return a.exec();
}
My .pro file is
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = untitled1
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
unix:!mac {
message("* Using settings for Unix/Linux.")
INCLUDEPATH += /usr/local/include/opencv
LIBS += -L/usr/local/lib/ \
-lopencv_core \
-lopencv_highgui \
-lopencv_imgproc
}
## OpenCV settings for Mac OS X
macx {
message("* Using settings for Mac OS X.")
INCLUDEPATH += /usr/local/include/opencv
LIBS += -L/usr/local/lib/ \
-lopencv_core \
-lopencv_highgui \
-lopencv_imgproc
}
## OpenCV settings for Windows and OpenCV
win32 {
message("* Using settings for Windows.")
INCLUDEPATH += "C:\\OpenCV\\opencv\\build\\include" \
"C:\\OpenCV\\opencv\\build\\include\\opencv" \
"C:\\OpenCV\\opencv\\build\\include\\opencv2"
LIBS += -L"C:\\OpenCV\\opencv\\build\\x64\\mingw\\lib" \
-lopencv_core244 \
-lopencv_highgui244 \
-lopencv_imgproc244
}
Environment Variables are:
OPENCV_DIR:C:\OpenCV\opencv\build\x64\mingw Path:
G:\5.0.2\Tools\MinGW\bin;G:\Qt\5.0.2\mingw47_32\bin
What could be the problem ?

Answer 1

I suggest you use the OpenCV 2.x API if possible. The error handling is better.
This would be cv::Mat image = cv::imread("E:\lena.jpg");
If the image is empty, it means you have the wrong path.
Also, make sure the opencv dll are in the path of your executable (core, highgui and imgproc).

Answer 2

You might need to change
-lopencv_core244 \
-lopencv_highgui244 \
-lopencv_imgproc244
to
-lopencv_core244d \
-lopencv_highgui244d \
-lopencv_imgproc244d
note 'd' at the end of each lib (if you are to build in debug)

Answer 3

Have you solved the problem?
Have you tried adding system("PAUSE"); after the return a.exec(); ?
Just some extra notes:
Also try
try
{
...
}
catch (Exception e)
{
...
}
to see if you can find the error
thirdly, check the file permissions for lena.jpg
Lastly, see if you can use the path E:\lena.jpg