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  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.

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  • TechnologistT Offline
    TechnologistT Offline
    Technologist
    wrote on last edited by Technologist
    #3

    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

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #4

      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

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • M Offline
        M Offline
        mcosta
        wrote on last edited by
        #5

        @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

        Once your problem is solved don't forget to:

        • Mark the thread as SOLVED using the Topic Tool menu
        • Vote up the answer(s) that helped you to solve the issue

        You can embed images using (http://imgur.com/) or (http://postimage.org/)

        1 Reply Last reply
        0
        • TechnologistT Offline
          TechnologistT Offline
          Technologist
          wrote on last edited by Technologist
          #6

          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.

          1 Reply Last reply
          0
          • M Offline
            M Offline
            mcosta
            wrote on last edited by
            #7

            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

            Once your problem is solved don't forget to:

            • Mark the thread as SOLVED using the Topic Tool menu
            • Vote up the answer(s) that helped you to solve the issue

            You can embed images using (http://imgur.com/) or (http://postimage.org/)

            1 Reply Last reply
            0
            • TechnologistT Offline
              TechnologistT Offline
              Technologist
              wrote on last edited by Technologist
              #8

              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?

              1 Reply Last reply
              0
              • M Offline
                M Offline
                mcosta
                wrote on last edited by
                #9

                The one you using to build the example

                Once your problem is solved don't forget to:

                • Mark the thread as SOLVED using the Topic Tool menu
                • Vote up the answer(s) that helped you to solve the issue

                You can embed images using (http://imgur.com/) or (http://postimage.org/)

                1 Reply Last reply
                0
                • TechnologistT Offline
                  TechnologistT Offline
                  Technologist
                  wrote on last edited by Technologist
                  #10

                  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 ...

                  1 Reply Last reply
                  0
                  • M Offline
                    M Offline
                    mcosta
                    wrote on last edited by
                    #11

                    HI,

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

                    Once your problem is solved don't forget to:

                    • Mark the thread as SOLVED using the Topic Tool menu
                    • Vote up the answer(s) that helped you to solve the issue

                    You can embed images using (http://imgur.com/) or (http://postimage.org/)

                    1 Reply Last reply
                    0
                    • TechnologistT Offline
                      TechnologistT Offline
                      Technologist
                      wrote on last edited by Technologist
                      #12

                      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 \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/qt_config.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/win32-g++/qmake.conf \
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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/lex.prf \
		../simpleapp/simpleapp.pro \
		C:/Qt/5.4/mingw491_32/lib/Qt5Core.prl
	$(QMAKE) -spec win32-g++ -o Makefile ..\simpleapp\simpleapp.pro
..\..\..\..\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:
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..\simpleapp\simpleapp.pro:
C:/Qt/5.4/mingw491_32/lib/Qt5Core.prl:
qmake: FORCE
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qmake_all: FORCE

make_first: release-make_first debug-make_first FORCE
all: release-all debug-all FORCE
clean: release-clean debug-clean FORCE
distclean: release-distclean debug-distclean FORCE
	-$(DEL_FILE) Makefile

release-mocclean:
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mocclean: release-mocclean debug-mocclean

release-mocables:
	$(MAKE) -f $(MAKEFILE).Release mocables
debug-mocables:
	$(MAKE) -f $(MAKEFILE).Debug mocables
mocables: release-mocables debug-mocables

check: first
FORCE:

$(MAKEFILE).Release: Makefile
$(MAKEFILE).Debug: Makefile
                      1 Reply Last reply
                      0
                      • JKSHJ Offline
                        JKSHJ Offline
                        JKSH
                        Moderators
                        wrote on last edited by
                        #13

                        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.

                        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                        1 Reply Last reply
                        0
                        • TechnologistT Offline
                          TechnologistT Offline
                          Technologist
                          wrote on last edited by Technologist
                          #14

                          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();
}
                          1 Reply Last reply
                          0
                          • JKSHJ Offline
                            JKSHJ Offline
                            JKSH
                            Moderators
                            wrote on last edited by JKSH
                            #15

                            @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.

                            Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                            1 Reply Last reply
                            0
                            • TechnologistT Offline
                              TechnologistT Offline
                              Technologist
                              wrote on last edited by
                              #16

                              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

                              1 Reply Last reply
                              0
                              • JKSHJ Offline
                                JKSHJ Offline
                                JKSH
                                Moderators
                                wrote on last edited by JKSH
                                #17

                                @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.

                                Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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                                0
                                • TechnologistT Offline
                                  TechnologistT Offline
                                  Technologist
                                  wrote on last edited by Technologist
                                  #18

                                  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;
}
                                  JKSHJ 1 Reply Last reply
                                  0
                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by SGaist
                                    #19

                                    Don't include opencv2 in your INCLUDEPATH entry

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

                                    Interested in AI ? www.idiap.ch
                                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                    1 Reply Last reply
                                    0
                                    • TechnologistT Offline
                                      TechnologistT Offline
                                      Technologist
                                      wrote on last edited by Technologist
                                      #20

                                      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.

                                      1 Reply Last reply
                                      0
                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #21

                                        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.

                                        Interested in AI ? www.idiap.ch
                                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                        1 Reply Last reply
                                        0
                                        • TechnologistT Technologist

                                          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;
}
                                          JKSHJ Offline
                                          JKSHJ Offline
                                          JKSH
                                          Moderators
                                          wrote on last edited by
                                          #22

                                          @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

                                          Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                                          1 Reply Last reply
                                          0

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