4. executable runs fine from local directory / throws error with IDE.

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executable runs fine from local directory / throws error with IDE.


  • My program has gone backwards. It seemed to be doing fine but not now:

    The routine is a simple show photo written in qt/opencv.

    It builds the executable but when it runs it from the IDE it throws an error and has to close.

    If I run the executable from its build directory it works fine, every time and every time I rebuild a new project of it.

    I've tried retracing my steps to the time before the error throwing appear. I've started and restarted the program editing as well. Is my installation corrupted now? QTCreator has stalled/frozen on some builds.

    0

  • Hi,

    you should verify the QT Creator "Run" settings for your Project.
    If you're able to run the program manually it means that the build is correct; probably in the "Run" settings some environmental settings are incorrect

    0

  • I haven't changed the run section at all that I can think of. My path= may have something incorrect, and am posting it:

    It is bloated and much of it unnecessary, but here is:

    C:\Qt\5.4\mingw491_32\bin;C:\Qt\Tools\mingw491_32\bin;%OPENCV%\build\x86\vc11\bin;C:\OpenCV-2.3.1\install\include\opencv;C:\OpenCV-2.3.1\bin;C:\OpenCV-2.3.1\install;C:\opencv-win\opencv\build\include\opencv2\core; c:\OpenCV-2.3.1\bin;C:\opencv-win\opencv\sources\modules;C:\Qt\5.4\mingw491_32\bin;C:\Qt\Tools\mingw491_32\bin;C:\Qt\5.4\mingw491_32\bin;C:\Users\Technologist;C:\Qt\Tools\QtCreator\bin;C:\OpenCV-2.3.1\bin;

    Now HelloWorld (as a test) isn't working either. C:\Users\Technologist\Documents\AnotherNewOne\main.cpp:
    1: error: qapplication.h: No such file or directory

    #include <qapplication.h>

    Straight from the tutorial:

    Qt Tutorial - Chapter 1: Hello, World!
    qapplication.h : I did a system wide search for the file with no luck.

    Its all related I think

    0
  • Lifetime Qt Champion

    Hi,

    Do you have a link to that tutorial ? In any case, you should use the QApplication include, that's the official supported way to do the includes

    0

  • @Technologist You started a thread with a problem related to an executable runnable manually but not using the IDE and after you started talking about code from a (BAD or OLD) tutorial.

    This is a little bit confusing for people that want to help you.
    Please focus on the initial problem.

    What I can see from the path you posted I think the OpenCV is built with Visual C++; so you have to check that is built for 32bit platform

    0

  • Sorry that was unintentional. I don't want to waste anyone's time.The old code compiled created the executable that successfully ran outside of the IDE. Was trying to relate different parts of the problem. Bottom line: am still having issues with the executable working outside the IDE but not within it, and hellonotepad not working making me think the two are related. Helloworld was to test this hypothesis. The build - it was done 32 bit compiler - using cmake. That fact that both simple programs wont work makes me wonder whether reinstall would be good ro to just hang in there.

    Hellonotepad link:
    https://web.njit.edu/all_topics/Prog_Lang_Docs/html/qt/tutorial1-01.html

    #include <QApplication>
 2        #include <QTextEdit>
 3
 4        int main(int argv, char **args)
 5        {
 6            QApplication app(argv, args);
 7
 8            QTextEdit textEdit;
 9            textEdit.show();
10
11            return app.exec();
12        }

    .pro file -> nothing unusual

    C:\Users\Technologist\Documents\simpleapp\main.cpp:1: error: QApplication: No such file or directory
    #include <QApplication>

    Thanks for your time.

    0

  • No problem,

    the link you posted refers to avery old Qt version (3.0.5).
    Can you post the CMakeLists.txt?? If the compiler doesn't find QApplication something is not set correctly on the CMakeLists.txt

    0

  • Sorry I have cmakelists.txt everywhere it seems. What is t he most relevant dir to pull it from?

    Would a makefile from the release directory of the program be helpful?

    0

  • The one you using to build the example

    0

  • Can you please be more specific. In the build directory for the app there are no cmakelists.txt. I am really just learning this particular aspect of programming. Makefiles in the build directory. "Run and Build"-->I don't know where to make file is ...

    0

  • HI,

    you said you're using CMake, so you should post the CMakeLists.txt in the source directory

    0

  • I used CMake to build the library, use qmake to build and run projects via the green button.

    Ok I found a cmakelists.txt in the source directory of the opencv build, but too large to paste.
    The next make file was in the program directory.

    #############################################################################
# Makefile for building: simpleapp
# Generated by qmake (3.0) (Qt 5.4.1)
# Project:  ..\simpleapp\simpleapp.pro
# Template: app
# Command: C:\Qt\5.4\mingw491_32\bin\qmake.exe -spec win32-g++ -o Makefile ..\simpleapp\simpleapp.pro
#############################################################################

MAKEFILE      = Makefile

first: release
install: release-install
uninstall: release-uninstall
QMAKE         = C:\Qt\5.4\mingw491_32\bin\qmake.exe
DEL_FILE      = del
CHK_DIR_EXISTS= if not exist
MKDIR         = mkdir
COPY          = copy /y
COPY_FILE     = $(COPY)
COPY_DIR      = xcopy /s /q /y /i
INSTALL_FILE  = $(COPY_FILE)
INSTALL_PROGRAM = $(COPY_FILE)
INSTALL_DIR   = $(COPY_DIR)
DEL_FILE      = del
SYMLINK       = copy /y
DEL_DIR       = rmdir
MOVE          = move
SUBTARGETS    =  \
		release \
		debug


release: FORCE
	$(MAKE) -f $(MAKEFILE).Release
release-make_first: FORCE
	$(MAKE) -f $(MAKEFILE).Release 
release-all: FORCE
	$(MAKE) -f $(MAKEFILE).Release all
release-clean: FORCE
	$(MAKE) -f $(MAKEFILE).Release clean
release-distclean: FORCE
	$(MAKE) -f $(MAKEFILE).Release distclean
release-install: FORCE
	$(MAKE) -f $(MAKEFILE).Release install
release-uninstall: FORCE
	$(MAKE) -f $(MAKEFILE).Release uninstall
debug: FORCE
	$(MAKE) -f $(MAKEFILE).Debug
debug-make_first: FORCE
	$(MAKE) -f $(MAKEFILE).Debug 
debug-all: FORCE
	$(MAKE) -f $(MAKEFILE).Debug all
debug-clean: FORCE
	$(MAKE) -f $(MAKEFILE).Debug clean
debug-distclean: FORCE
	$(MAKE) -f $(MAKEFILE).Debug distclean
debug-install: FORCE
	$(MAKE) -f $(MAKEFILE).Debug install
debug-uninstall: FORCE
	$(MAKE) -f $(MAKEFILE).Debug uninstall

Makefile: ../simpleapp/simpleapp.pro ../../../../Qt/5.4/mingw491_32/mkspecs/win32-g++/qmake.conf ../../../../Qt/5.4/mingw491_32/mkspecs/features/spec_pre.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/qdevice.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/device_config.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/common/shell-win32.conf \
		../../../../Qt/5.4/mingw491_32/mkspecs/qconfig.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_axbase.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_axbase_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_axcontainer.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_axcontainer_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_axserver.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_axserver_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_bluetooth.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_bluetooth_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_bootstrap_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_clucene_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_concurrent.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_concurrent_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_core.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_core_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_dbus.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_dbus_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_declarative.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_declarative_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_designer.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_designer_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_designercomponents_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_enginio.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_enginio_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_gui.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_gui_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_help.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_help_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_location.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_location_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_multimedia.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_multimedia_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_multimediawidgets.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_multimediawidgets_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_network.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_network_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_nfc.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_nfc_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_opengl.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_opengl_private.pri \
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		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_openglextensions_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_platformsupport_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_positioning.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_positioning_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_printsupport.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_printsupport_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_qml.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_qml_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_qmldevtools_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_qmltest.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_qmltest_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_qtmultimediaquicktools_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_quick.pri \
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		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webkitwidgets.pri \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/qt_config.prf \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/spec_post.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/exclusive_builds.prf \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/default_pre.prf \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/default_post.prf \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/moc.prf \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/lex.prf \
		../simpleapp/simpleapp.pro \
		C:/Qt/5.4/mingw491_32/lib/Qt5Core.prl
	$(QMAKE) -spec win32-g++ -o Makefile ..\simpleapp\simpleapp.pro
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..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\device_config.prf:
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..\simpleapp\simpleapp.pro:
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qmake: FORCE
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qmake_all: FORCE

make_first: release-make_first debug-make_first FORCE
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clean: release-clean debug-clean FORCE
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mocables: release-mocables debug-mocables

check: first
FORCE:

$(MAKEFILE).Release: Makefile
$(MAKEFILE).Debug: Makefile
    0
  • Moderators

    Hi @Technologist,

    Let's take a step back. Do an officially-supported Hello World test:

    1. Open Qt Creator
    2. Create a new project: "File" -> "New File or Project..." -> "Application" -> "Qt Widgets Application"
    3. Click the green button.

    Does this work? If so, examine the .pro file and look for differences with yours.

    0

  • Ok, I built the "official" hello world app which worked flawlessly. The #include <QApplication>
    didn't throw an error.

    I ran the "Unofficial" hello world and compilation stopped secondary to error: qapplication.h: No such file or directory

    Ive compared both .pro files and I don't see why the unofficial can't find the same include that the "official" hello world can. I'll post

    "official" HW .pro file/main

    #-------------------------------------------------
#
# Project created by QtCreator 2015-04-17T08:55:34
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TestApp
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

"Unofficial" HW File
'''

    Unofficial Hello world

    .pro file - qapp/qbutton not found

    QT       += core

QT       -= gui

TARGET = HelloWorldUnofficialvsTestApp
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp

#include <qapplication.h>
#include <qpushbutton.h>


int main( int argc, char **argv )
{
    QApplication a( argc, argv );

    QPushButton hello( "Hello world!", 0 );
    hello.resize( 100, 30 );

    a.setMainWidget( &hello );
    hello.show();
    return a.exec();
}
    0
  • Moderators

    @Technologist said:

    Ive compared both .pro files and I don't see why the unofficial can't find the same include that the "official" hello world can.

    By default, the Qt Core and Qt GUI modules are available for your project. Let's see how the .pro files change this.

    "official" HW .pro file
    QT += widgets

    This line says, "ADD the Qt Widgets module to my project". This is required to find QApplication and QPushButton, because they belong to the Qt Widgets module. They used to be in the Qt GUI module in Qt 4, but Qt 5 has a new structure. This is one big reason to avoid old tutorials and stick to new ones.

    Unofficial Hello world
    QT -= gui

    This line says, "EXCLUDE the Qt GUI module from my project". This removes all GUI functionality, like OpenGL. Since you want to build an OpenCV app, you probably don't want this option!

    See https://doc.qt.io/qt-5/qtmodules.html for a list of all available modules.

    0

  • That shows that the configuration problem of .pro file was human error. It found my qt header files. Thanks for the pointer on opel GL etc. This solution rules out a single error behind both. This problem is fixed however the first problem persists: the IDE crashes when I build the "Show Picture" routine, but runs perfectly when I execute it from build directory. Do I need to close out this ticket and reopen it or finish out here?

    Thanks for your time

    0
  • Moderators

    @Technologist said:

    That shows that the configuration problem of .pro file was human error. It found my qt header files. Thanks for the pointer on opel GL etc. This solution rules out a single error behind both. This problem is fixed however the first problem persists: the IDE crashes when I build the "Show Picture" routine, but runs perfectly when I execute it from build directory. Do I need to close out this ticket and reopen it or finish out here?

    Thanks for your time

    You're welcome :)

    Yes, this little excursion helped us to establish that your installation of Qt and the IDE are fine. So, the problem probably lies in your project configuration or environment.

    I just noticed that you have Qt and Qt Creator in your PATH. This is very bad, because they both contain different (and incompatible) versions of the same DLL (e.g. Qt5Core.dll). Remove them from your PATH. There is no need for anything Qt-related to be in the PATH, and having them there is the cause of many mysterious crashes.

    After cleaning your PATH, try running your program again. (To do it outside the IDE the proper way, see http://wiki.qt.io/Deploy_an_Application_on_Windows )

    In general, MSVC and MinGW are incompatible. Qt Creator is a Qt-built program too, which uses MSVC 2010-built Qt DLLs. I also noticed that your copy OpenCV is built with MSVC 2012. I'm not sure if this is compatible with your MinGW-built app.

    You can continue posting here, as it's still about your original post.

    0

  • FYI the platform was built using cmake and mingw, not MSVS (I don't have msvs on the system.) -- if that's coming across from the ?path?. Was it this line: %OPENCV%\buildx86\vc11Honestly I think I put it in the path mistakenly. Can I remove it?

    OK cleaned my path. No more missing qt files with Widgets addition to pro file. Application still continue to crash in intialization phase. Sometimes it will throw this error a lot of the time or just open a window and crash. Below it can't find an opencv file.

    The program can't start because libgcc_s_dw2-1.dll is missing from your computer Try installing the program to fix this problem.

    New local path:C:\OpenCV-2.3.1\bin;C:\OpenCV-2.3.1\install\include\opencv2;C:\OpenCV-2.3.1\lib;
    System path:%OPENCV%\build\x86\vc11\bin; c:\OpenCV-2.3.1\bin;C:\opencv-win\opencv\sources\modules;

    error :C:\Users\Technologist\Documents\NewOne\main.cpp:2: error: opencv2/core/core.hpp: No such file or directory #include <opencv2/core/core.hpp>
    ^
    pro. file:

    QT       += core

QT       += gui
QT       += widgets

TARGET = NewOne
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

INCLUDEPATH += "C:/OpenCV-2.3.1/install/include/opencv2/"

LIBS += -LC:\OpenCV-2.3.1\lib\
    -lopencv_core2411.dll.a \
    -lopencv_highgui2411.dl.al \
    -lopencv_imgproc2411.dll.a \
    -lopencv_features2d2411.dll.a \
    -lopencv_calib3d2411.dll.a

    #include <QCoreApplication>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
int main() {
        // read an image
        cv::Mat image= cv::imread("img.jpg");
        // create image window named "My Image"
        cv::namedWindow("My Image");
        // show the image on window
        cv::imshow("My Image", image);
        // wait key for 5000 ms
        cv::waitKey(5000);
        return 1;
}
    0 1 Reply
  • Lifetime Qt Champion

    Don't include opencv2 in your INCLUDEPATH entry

    INCLUDEPATH += "C:/OpenCV-2.3.1/install/include/"

    0

  • I don't see any opencv2 in your includepath unless you are referring to the opencv2 down the file directory from there.

    INCLUDEPATH += "C:\OpenCV-2.3.1\install\include\opencv2"

    Sorry, now I am feeling newbish.

    0
  • Lifetime Qt Champion

    That's the point. Since you use:

    #include <opencv2/core/core.hpp>

    If you use INCLUDEPATH += "C:/OpenCV-2.3.1/install/include/opencv2/" then the headers won't be found because you are trying to include a file that would be searched like:
    "C:/OpenCV-2.3.1/install/include/opencv2/opencv2/core/core.hpp".

    So either remove opencv2 from your include lines or remove it from your INCLUDEPATH line.

    0
  • Moderators

    @Technologist said:

    FYI the platform was built using cmake and mingw, not MSVS (I don't have msvs on the system.) -- if that's coming across from the ?path?. Was it this line: %OPENCV%\buildx86\vc11

    Yes, it was that line. "VC11" represents Visual Studio 2012.

    Honestly I think I put it in the path mistakenly. Can I remove it?

    I don't know, as I've never used OpenCV myself. How does OpenCV recommend you set up your libraries?

    OK cleaned my path. No more missing qt files with Widgets addition to pro file. Application still continue to crash in intialization phase. Sometimes it will throw this error a lot of the time or just open a window and crash. Below it can't find an opencv file.

    The program can't start because libgcc_s_dw2-1.dll is missing from your computer Try installing the program to fix this problem.

    That's not an error that can only happen "some of the time" for a particular setup -- it either happens all of the time, or it won't happen.

    I suspect that you are trying to launch your app in different ways but then combining their results into one observation. Please be systematic in your investigations: Describe what you do leading up to a specific crash (e.g. "This happens I try to launch my app from the IDE" and "That happens when I try to launch my app from the build directory")

    Note: Launching from a build directory is like trying to run a deployed application. Follow http://wiki.qt.io/Deploy_an_Application_on_Windows carefully

    0

  • I suspect that you are trying to launch your app in different ways but then combining their results into one observation.. Please be systematic in your investigations.

    The more systematic the better. I am trying to get all my apps, as with any good scientific analysis, running from the same baseline. We have done most of that already by clearing up the header and include file issues, and this has prepared the way for a final solution, easier to see with less stuff being wrong. Now its finally the library error they all seem to share.

    Thx for your time.

    Below: :-1: error: cannot find -llibopencv_core2411.dll.a  :-1: error: cannot find -llibopencv_highgui2411.dll.a

    .pro

    QT       += core
QT       += widgets
QT       += gui

TARGET = AnotherWack
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp

INCLUDEPATH += "C:/OpenCV-2.3.1/install/include/"

LIBS += -LC:/OpenCV-2.3.1/lib \
        -llibopencv_core2411.dll.a \
        -llibopencv_highgui2411.dll.a \

    main

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

int main() {
        // read an image
        cv::Mat image= cv::imread("img.jpg");
        // create image window named "My Image"
        cv::namedWindow("My Image");
        // show the image on window
        cv::imshow("My Image", image);
        // wait key for 5000 ms
        cv::waitKey(5000);
        return 1;
}
    0

  • @Technologist said:

    -llibopencv_core2411.dll.a

    Hi,

    if you use the flag -l you have to omit the lib prefix and the extensions -llibopencv_core2411

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  • I'm no longer getting the include and library errors that I was. The main error was getting a build error with a working executable. Now after installing these changes, I get the build error and executable error (they are the same) . Somehow, am chagrin to say, I can't account for the change.They both crash now. I wanted to try putting the DLL in with the executable to see if that would work, but the relevant 5 project dlls were gone (??). I had to poach them from an apparent windows directory vc 11 and copy them to the library that couldn't find them. The same error would continue.

    Present code:
    main.cpp

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

int main() {

    // read an image
    cv::Mat image= cv::imread("img.jpg");
    // create image window named "My Image"
    cv::namedWindow("My Image");
    // show the image on window
    cv::imshow("My Image", image);
    // wait key for 5000 ms
    cv::waitKey(5000);

    return 1;
}

    .pro

    
QT       += core

QT       += gui
QT       += widgets

TARGET = NewOne
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

INCLUDEPATH += C:/OpenCV-2.3.1/install/include/

LIBS += -LC:\OpenCV-2.3.1\lib\
    -lopencv_core2411 \
    -lopencv_highgui2411 \
    -lopencv_imgproc2411 \
    -lopencv_features2d2411\
    -lopencv_calib3d2411
    0
  • Lifetime Qt Champion

    Then just to be sure: which Qt package are you using ?

    0

  • The version is qt 5.4
    Using 64 bit os

    On a few directories I made them the version of the tutorial (OpenCV-2.3.1) to stay on track, but the overall version was 2.4.11 that was downloaded and installed.

    0
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