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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
    #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

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    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/)

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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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          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/)

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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 \
		../../../../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 \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_openglextensions.pri \
		../../../../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 \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_quick_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_quickparticles_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_quickwidgets.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_quickwidgets_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_script.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_script_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_scripttools.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_scripttools_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_sensors.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_sensors_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_serialport.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_serialport_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_sql.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_sql_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_svg.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_svg_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_testlib.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_testlib_private.pri \
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		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webchannel.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webchannel_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webkit.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webkit_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webkitwidgets.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webkitwidgets_private.pri \
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		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_webview_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_widgets.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_widgets_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_winextras.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_winextras_private.pri \
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		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_xml_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_xmlpatterns.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/modules/qt_lib_xmlpatterns_private.pri \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/qt_functions.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/qt_config.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/qt_config.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/win32-g++/qmake.conf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/spec_post.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/exclusive_builds.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/default_pre.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/default_pre.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/resolve_config.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/exclusive_builds_post.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/default_post.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/console.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/win32/rtti.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/precompile_header.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/warn_on.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/qt.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/resources.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/moc.prf \
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		../../../../Qt/5.4/mingw491_32/mkspecs/features/exceptions.prf \
		../../../../Qt/5.4/mingw491_32/mkspecs/features/yacc.prf \
		../../../../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:
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..\..\..\..\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:
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..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_concurrent_private.pri:
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..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_webkit.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_webkit_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_webkitwidgets.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_webkitwidgets_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_websockets.pri:
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..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_webview_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_widgets.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_widgets_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_winextras.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_winextras_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_xml.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_xml_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_xmlpatterns.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\modules\qt_lib_xmlpatterns_private.pri:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\qt_functions.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\qt_config.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\win32\qt_config.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\win32-g++\qmake.conf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\spec_post.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\exclusive_builds.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\default_pre.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\win32\default_pre.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\resolve_config.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\exclusive_builds_post.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\default_post.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\win32\console.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\win32\rtti.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\precompile_header.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\warn_on.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\qt.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\resources.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\moc.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\testcase_targets.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\exceptions.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\yacc.prf:
..\..\..\..\Qt\5.4\mingw491_32\mkspecs\features\lex.prf:
..\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 Online
                JKSHJ Online
                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 Online
                    JKSHJ Online
                    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 Online
                        JKSHJ Online
                        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

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                            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

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                                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 Online
                                  JKSHJ Online
                                  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
                                      0
                                      • TechnologistT Offline
                                        TechnologistT Offline
                                        Technologist
                                        wrote on last edited by Technologist
                                        #25

                                        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
                                        1 Reply Last reply
                                        0
                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #26

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

                                          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

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