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Thread: QtGui/QApplication: No such file or directory

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    Exclamation QtGui/QApplication: No such file or directory

    So, recently Nokia released QtSingleApplication under LGPL (found in Qt Solutions). So, I downloaded the .zip file, unzipped it, and copied it to $QTDIR\src\qtsingleapplication. Then, due to some limitations of LGPL, I open Command Prompt, cd'd to that directory, and ran "configure.bat -library", ran qmake, and then make.

    In main.cpp I have a QtSingleApplication object instead of QApplication, so I put "#include <QtSingleApplication>" at the top.

    So now in Qt Creator, everything seems good - Qt Creator seems to recognize the existence of QtGui/QApplication. But the compiler doesn't:

    In file included from c:/Qt/4.5/qt/src/QtSingleApplication/src/QtSingleApplication.cpp:48:
    c:/Qt/4.5/qt/src/QtSingleApplication/src/qtsingleapplication.h:48:30: QtGui/QApplication: No such file or directory
    In file included from c:/Qt/4.5/qt/src/QtSingleApplication/src/QtSingleApplication.cpp:48:
    c:/Qt/4.5/qt/src/QtSingleApplication/src/qtsingleapplication.h:69: error: expected class-name before '{' token

    ...
    And it goes on with errors like that, it basically seems like it can't find the Qt includes, but my environment variables are all good. Any ideas?

    ~codeslicer

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    Default Re: QtGui/QApplication: No such file or directory

    How does you project file look like?
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


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    Lightbulb Re: QtGui/QApplication: No such file or directory

    This is my project file:

    Qt Code:
    1. include(C:\Qt\4.5\qt\src\qtsingleapplication\src\qtsingleapplication.pri)
    2.  
    3. TEMPLATE = app
    4. QT += gui \
    5. core \
    6. network
    7. CONFIG += qt \
    8. warn_on \
    9. resources \
    10. debug
    11. DESTDIR = bin
    12. OBJECTS_DIR = build
    13. MOC_DIR = build
    14. UI_DIR = build
    15. SOURCES += src/main.cpp \
    16. src/mainwindow.cpp \
    17. src/about.cpp \
    18. src/settings.cpp \
    19. src/parser.cpp
    20. HEADERS += src/mainwindow.h \
    21. src/about.h \
    22. src/settings.h \
    23. src/parser.h
    24. FORMS += ui/mainwindow.ui \
    25. ui/about.ui
    26. RESOURCES += res/main.qrc
    27. RC_FILE += src/main.rc
    To copy to clipboard, switch view to plain text mode 

    And then qtsingleapplication.pri is like this:

    Qt Code:
    1. include(../common.pri)
    2. INCLUDEPATH += $$PWD
    3. DEPENDPATH += $$PWD
    4. QT *= network
    5.  
    6. qtsingleapplication-uselib:!qtsingleapplication-buildlib {
    7. LIBS += -L$$QTSINGLEAPPLICATION_LIBDIR -l$$QTSINGLEAPPLICATION_LIBNAME
    8. } else {
    9. SOURCES += $$PWD/qtsingleapplication.cpp $$PWD/qtlocalpeer.cpp
    10. HEADERS += $$PWD/qtsingleapplication.h $$PWD/qtlocalpeer.h
    11. }
    12.  
    13. win32 {
    14. contains(TEMPLATE, lib):contains(CONFIG, shared):DEFINES += QT_QTSINGLEAPPLICATION_EXPORT
    15. else:qtsingleapplication-uselib:DEFINES += QT_QTSINGLEAPPLICATION_IMPORT
    16. }
    To copy to clipboard, switch view to plain text mode 

    And common.pri:

    Qt Code:
    1. infile(config.pri, SOLUTIONS_LIBRARY, yes): CONFIG += qtsingleapplication-uselib
    2. TEMPLATE += fakelib
    3. QTSINGLEAPPLICATION_LIBNAME = $$qtLibraryTarget(QtSolutions_SingleApplication-2.6)
    4. TEMPLATE -= fakelib
    5. QTSINGLEAPPLICATION_LIBDIR = $$PWD/lib
    6. unix:qtsingleapplication-uselib:!qtsingleapplication-buildlib:QMAKE_RPATHDIR += $$QTSINGLEAPPLICATION_LIBDIR
    To copy to clipboard, switch view to plain text mode 
    Last edited by codeslicer; 7th July 2009 at 17:02. Reason: changed quote to code

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    Default Re: QtGui/QApplication: No such file or directory

    Well, Google ended up being the savior. Apparently it's a compiler bug as the Include path wasn't included in the compilation of the Solution. So I had to manually edit the Makefile, as shown in a comment by Brett in the end of this page: http://labs.trolltech.com/blogs/2009...work-solution/

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    Default Re: QtGui/QApplication: No such file or directory

    I also got this error after modifying the qtsingleapplication.cpp file.

    mingw32-make thought the file QtSingleApplication was a binary compiled from qtsingleapplication.cpp and, because the .cpp file was newer than the "binary", make used its implicit rules to recompile the "binary" from source. Hence the lack of include flags in the compilation command and the inaccessible header files.

    Solved it with a "touch QtSingleApplication".

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