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QTextStream not working while running simple console output application Ask Question up vote

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qtextstreamstdoutconsole appqt4
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  • J Offline
    J Offline
    Johnx8664
    wrote on last edited by
    #1

    I am currently working on learning Qt. The book that I am using used Qt 4.7.0 when it was published back in 2011. So I have set up a virtual machine that is running Windows 7 and I used the Qt 4.7.0 MinGW installer and installed the latest version of GCC/G++ using MinGW. Good to go? I suppose. I have set up the build environment to use Bash, qmake, and make commands via the command prompt and have ensured all needed system environment variables are set. My program compiles fine and the executable is built. However, once I run the executable, I get the following output:

    QFile::open: File access not specified

    Note: I recompiled this program using Qt5 and it all worked fine. However, I am trying to adhere as well as I can to the Qt4 code the book uses so that I do not have to worry about porting over the code to work with Qt 5 standards.

    main.cpp

    #include <QString> 
#include <QTextStream> 

QTextStream cout(stdout); 

int main(int argc, char** argv)
{
    QString name("John Doe"); 
    cout << name << endl; 
    return 0; 
}

    Project File: test.pro

    ######################################################################
# Automatically generated by qmake (2.01a) Sun Jun 24 19:06:36 2018
######################################################################

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
CONFIG += console

# Input
SOURCES += main.cpp

    Running Make in the Directory

    C:\Users\John\Desktop\test>make
make -f Makefile.Debug
make[1]: Entering directory `C:/Users/John/Desktop/test'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE
DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -
nclude/QtCore' -I'../../../../Qt/4.7.0/include/QtGui' -I
clude' -I'.' -I'../../../../Qt/4.7.0/include/ActiveQt' -
Qt/4.7.0/mkspecs/default' -o debug/main.o main.cpp
In file included from c:\qt\4.7.0\include\qtcore\qobject
                 from c:\qt\4.7.0\src\corelib\kernel\qob
                 from c:\qt\4.7.0\include\qtcore\qobject
                 from c:\qt\4.7.0\src\corelib\io\qiodevi
                 from c:\qt\4.7.0\include\qtcore\qiodevi
                 from c:\qt\4.7.0\src\corelib\io\qtextst
                 from c:\qt\4.7.0\include\qtcore\qtextst
                 from c:\qt\4.7.0\include\qtcore\qtextst
                 from main.cpp:2:
c:\qt\4.7.0\src\corelib\kernel\qobjectdefs.h:217:20: war
literal; C++11 requires a space between literal and stri
ix]
 # define QLOCATION "\0"__FILE__":"QTOSTRING(__LINE__)
                    ^
c:\qt\4.7.0\src\corelib\kernel\qobjectdefs.h:217:32: war
literal; C++11 requires a space between literal and stri
ix]
 # define QLOCATION "\0"__FILE__":"QTOSTRING(__LINE__)
                                ^
g++ -Wl,-enable-stdcall-fixup -Wl,-enable-auto-import -W
-reloc -Wl,-subsystem,console -mthreads -o debug/test.ex
/4.7.0/lib' -lQtGuid4 -lQtCored4
make[1]: Leaving directory `C:/Users/John/Desktop/test'

    Running Executable

    Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\John>cd desktop\test

C:\Users\John\Desktop\test>clear


C:\Users\John\Desktop\test>cd debug

C:\Users\John\Desktop\test\debug>ls
main.o  test.exe

C:\Users\John\Desktop\test\debug>test.exe
QFile::open: File access not specified

C:\Users\John\Desktop\test\debug>

    Makefile

    #############################################################################
# Makefile for building: test
# Generated by qmake (2.01a) (Qt 4.7.0) on: Sun Jun 24 19:12:02 2018
# Project:  test.pro
# Template: app
# Command: c:/Qt/4.7.0/bin/qmake.exe -o Makefile test.pro
#############################################################################

first: debug
install: debug-install
uninstall: debug-uninstall
MAKEFILE      = Makefile
QMAKE         = c:/Qt/4.7.0/bin/qmake.exe
DEL_FILE      = rm
CHK_DIR_EXISTS= test -d
MKDIR         = mkdir
COPY          = cp
COPY_FILE     = $(COPY)
COPY_DIR      = xcopy /s /q /y /i
INSTALL_FILE  = $(COPY_FILE)
INSTALL_PROGRAM = $(COPY_FILE)
INSTALL_DIR   = $(COPY_DIR)
DEL_FILE      = rm
SYMLINK       = 
DEL_DIR       = rmdir
MOVE          = mv
CHK_DIR_EXISTS= test -d
MKDIR         = mkdir
SUBTARGETS    =  \
        debug \
        release

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

Makefile: test.pro  ../../../../Qt/4.7.0/mkspecs/default/qmake.conf ../../../../Qt/4.7.0/mkspecs/qconfig.pri \
        ../../../../Qt/4.7.0/mkspecs/modules/qt_webkit_version.pri \
        ../../../../Qt/4.7.0/mkspecs/features/qt_functions.prf \
        ../../../../Qt/4.7.0/mkspecs/features/qt_config.prf \
        ../../../../Qt/4.7.0/mkspecs/features/exclusive_builds.prf \
        ../../../../Qt/4.7.0/mkspecs/features/default_pre.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/default_pre.prf \
        ../../../../Qt/4.7.0/mkspecs/features/debug.prf \
        ../../../../Qt/4.7.0/mkspecs/features/debug_and_release.prf \
        ../../../../Qt/4.7.0/mkspecs/features/default_post.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/default_post.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/console.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/rtti.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/exceptions.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/stl.prf \
        ../../../../Qt/4.7.0/mkspecs/features/shared.prf \
        ../../../../Qt/4.7.0/mkspecs/features/warn_on.prf \
        ../../../../Qt/4.7.0/mkspecs/features/qt.prf \
        ../../../../Qt/4.7.0/mkspecs/features/win32/thread.prf \
        ../../../../Qt/4.7.0/mkspecs/features/moc.prf \
        ../../../../Qt/4.7.0/mkspecs/features/resources.prf \
        ../../../../Qt/4.7.0/mkspecs/features/uic.prf \
        ../../../../Qt/4.7.0/mkspecs/features/yacc.prf \
        ../../../../Qt/4.7.0/mkspecs/features/lex.prf \
        ../../../../Qt/4.7.0/mkspecs/features/incredibuild_xge.prf \
        ../../../../Qt/4.7.0/mkspecs/features/include_source_dir.prf
    $(QMAKE) -o Makefile test.pro
../../../../Qt/4.7.0/mkspecs/qconfig.pri:
../../../../Qt/4.7.0/mkspecs/modules/qt_webkit_version.pri:
../../../../Qt/4.7.0/mkspecs/features/qt_functions.prf:
../../../../Qt/4.7.0/mkspecs/features/qt_config.prf:
../../../../Qt/4.7.0/mkspecs/features/exclusive_builds.prf:
../../../../Qt/4.7.0/mkspecs/features/default_pre.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/default_pre.prf:
../../../../Qt/4.7.0/mkspecs/features/debug.prf:
../../../../Qt/4.7.0/mkspecs/features/debug_and_release.prf:
../../../../Qt/4.7.0/mkspecs/features/default_post.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/default_post.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/console.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/rtti.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/exceptions.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/stl.prf:
../../../../Qt/4.7.0/mkspecs/features/shared.prf:
../../../../Qt/4.7.0/mkspecs/features/warn_on.prf:
../../../../Qt/4.7.0/mkspecs/features/qt.prf:
../../../../Qt/4.7.0/mkspecs/features/win32/thread.prf:
../../../../Qt/4.7.0/mkspecs/features/moc.prf:
../../../../Qt/4.7.0/mkspecs/features/resources.prf:
../../../../Qt/4.7.0/mkspecs/features/uic.prf:
../../../../Qt/4.7.0/mkspecs/features/yacc.prf:
../../../../Qt/4.7.0/mkspecs/features/lex.prf:
../../../../Qt/4.7.0/mkspecs/features/incredibuild_xge.prf:
../../../../Qt/4.7.0/mkspecs/features/include_source_dir.prf:
qmake: qmake_all FORCE
    @$(QMAKE) -o Makefile test.pro

qmake_all: FORCE

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

check: first

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

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

$(MAKEFILE).Debug: Makefile
$(MAKEFILE).Release: Makefile
    A 1 Reply Last reply
    0
  • SGaistS Offline
    SGaistS Offline
    SGaist Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi and welcome to devnet,

    Which book would that be ?

    In any case, you really should consider doing it with Qt 5. Qt 4 has already reached end of life since some times now and learning Qt should rather be using Qt 5. Most of the books about Qt are for the fourth series but are still relevant with some tweaks here and there.

    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
    1
  • A Offline
    A Offline
    ambershark
    replied to Johnx8664 on last edited by
    #3

    @Johnx8664 Learning Qt4 at this point would be a waste of your time. Like @SGaist said it's long past it's end of life. Qt5 is 12 major releases into it's life cycle now and 5 years old now.

    I would grab a book on Qt5, or I find it's pretty easy to learn Qt just from the docs that come with it. If you know C++ well (and you should if you are tackling Qt), then you should be fine learning from the Qt Assistant docs. There are a lot of examples and tutorials in there as well.

    My L-GPL'd C++ Logger github.com/ambershark-mike/sharklog

    1 Reply Last reply
    0

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