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

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  • 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/)

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    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.

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      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/)

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        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/)

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            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 ...

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              • 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/)

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                • 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 \
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                  		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_enginio.pri \
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                  		../simpleapp/simpleapp.pro \
                  		C:/Qt/5.4/mingw491_32/lib/Qt5Core.prl
                  	$(QMAKE) -spec win32-g++ -o Makefile ..\simpleapp\simpleapp.pro
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                  ..\simpleapp\simpleapp.pro:
                  C:/Qt/5.4/mingw491_32/lib/Qt5Core.prl:
                  qmake: FORCE
                  	@$(QMAKE) -spec win32-g++ -o Makefile ..\simpleapp\simpleapp.pro
                  
                  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:
                  	$(MAKE) -f $(MAKEFILE).Release mocclean
                  debug-mocclean:
                  	$(MAKE) -f $(MAKEFILE).Debug mocclean
                  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

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                    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

                            1 Reply Last reply
                            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
                                      • TechnologistT Offline
                                        TechnologistT Offline
                                        Technologist
                                        wrote on last edited by Technologist
                                        #23

                                        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;
                                        }
                                        
                                        1 Reply Last reply
                                        0
                                        • M Offline
                                          M Offline
                                          mcosta
                                          wrote on last edited by
                                          #24

                                          @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

                                          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
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