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Thread: "Undefined reference to" in QtCreator plugin

  1. #1
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    Default "Undefined reference to" in QtCreator plugin

    Hi,
    I´m developing a plugin for QtCreator 2.0.1 (based on Qt 4.7.0) on a Windows machine.
    My plugin would be a key-logger; to achieve this I thought about having a static method in my plugin that will instantiate an object for writing the data from the file, the static method is then called by the CppEditor plugin (by modifying it manually).
    When compiling with mingw32 i get an "undefined reference to LoggerProxy()" that is my object.
    Can somebody help me fixing this? I´m quite new to Qt and C++ in general.
    Thank you

  2. #2
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    Default Re: "Undefined reference to" in QtCreator plugin

    #include <Logger.h>
    #include <qlog/qlog.h>

    Included??

  3. #3
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    Default Re: "Undefined reference to" in QtCreator plugin

    in my main class (the one that implements IPlugin), LoggerPlugin, I included LoggerProxy.h that is the header that defines the object.
    what is that qlog.h? Why I would need it?
    Thank you

  4. #4
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    Default Re: "Undefined reference to" in QtCreator plugin

    what I have noticed after some tries is that if I move the code of my object from the .cpp file to the .h file mingw32 doesn't complain at all while compiling.
    Any advice?

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    Default Re: "Undefined reference to" in QtCreator plugin

    Show the code, it's almost impossible to help without seeing it.

  6. #6
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    Default Re: "Undefined reference to" in QtCreator plugin

    LoggerPlugin.h
    Qt Code:
    1. #ifndef LOGGERPLUGIN_H
    2. #define LOGGERPLUGIN_H
    3. #include <QTextStream>
    4. #include <QtPlugin>
    5. #include <QStringList>
    6. #include <QMessageBox>
    7. #include <QString>
    8. #include <QtCore/QDebug>
    9. #include <Logger/xmlproxy.h>
    10.  
    11.  
    12.  
    13.  
    14. class LoggerPlugin : public ExtensionSystem::IPlugin
    15. {
    16.  
    17. private:
    18. QString lookupName(int id);
    19. int lookupID(QString name);
    20.  
    21. public:
    22.  
    23. XMLLoggerPlugin();
    24. ~XMLLoggerPlugin();
    25. void extensionsInitialized();
    26. bool initialize(const QStringList & arguments, QString * errorString);
    27. void shutdown();
    28.  
    29. // this is the method called by CppEditor. It just instantiate my proxy object.
    30. static void register(QString name, QString filename, QString type){
    31. XMLProxy pr(name, filename, type);
    32. }
    33. };
    34. #endif // LOGGERPLUGIN_H
    To copy to clipboard, switch view to plain text mode 

    LoggerPlugin.cpp then contains the implementation of the initialize and shutdown methods, but nothing tricky just clean-up code.

    XMLProxy.h
    Qt Code:
    1. #ifndef XMLPROXY_H
    2. #define XMLPROXY_H
    3. class XMLProxy
    4. {
    5. public:
    6. XMLProxy();
    7. ~XMLProxy();
    8. XMLProxy(QString name, QString filename, QString type);
    9. void serializeXML();
    10. QString _name, _filename, _type;
    11. };
    12.  
    13. #endif // XMLPROXY_H
    To copy to clipboard, switch view to plain text mode 

    and the class implementation
    XMLProxy.cpp
    Qt Code:
    1. #include <QDateTime>
    2. #include <QFile>
    3. #include <QXmlStreamWriter>
    4. #include <QDate>
    5. #include <extensionsystem/iplugin.h>
    6. #include <QtXml/QDomDocument>
    7. #include <QtXml/QDomElement>
    8. #include <QtXml/QDomText>
    9. #include "xmlproxy.h"
    10. XMLProxy::XMLProxy(){}
    11. XMLProxy::XMLProxy(QString name, QString filename, QString type){
    12. this->_name=name;
    13. this->_filename=namefilename;
    14. this->_type=type;
    15. }
    16.  
    17. XMLProxy::serializeXML(){
    18. //stub of the method to serialize a XMLProxy to a XML file
    19. QFile file("Logfile.xml");
    20. QDomDocument doc("Events");
    21. QDomElement ev = doc.createElement("event");
    22. QDomElement typeNode = doc.createElement("type");
    23. QDomText typeTxt = doc.createTextNode(this->_type);
    24. typeNode.appendChild(typeTxt);
    25. ev.appendChild(typeNode);
    26. //...to be cont´d
    27. }
    To copy to clipboard, switch view to plain text mode 

    it´s not working like this but if I move the code from XMLProxy.cpp to XMLProxy.h it works
    To compile I do "qmake ..\qtcreator.pro -recursive CONFIG+=debug QT+=xml" from the build directory of qtcreator folder and then, from the same dir, "mingw32-make debug"

    Thank you for any help

  7. #7
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    Default Re: "Undefined reference to" in QtCreator plugin

    That´s the output after executing mingw32-make

    g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
    oc -Wl,-s -mthreads -Wl -shared -Wl,--out-implib,c:\ProjectII\qt-creator-win\bui
    ld\lib\qtcreator\plugins\Nokia\libTextEditor.a -o ..\..\..\lib\qtcreator\plugins
    \Nokia\TextEditor.dll object_script.TextEditor.Release -L"c:\Qt\2010.05\qt\lib"
    -LC:/ProjectII/qt-creator-win/build/lib/qtcreator -LC:/ProjectII/qt-creator-win
    /build/lib/qtcreator/plugins/Nokia -lUtils -lAggregation -lExtensionSystem -lBot
    an -lNet7ssh -lCore -lFind -lQtConcurrent -lLocator -LC:/ProjectII/qt-creator-wi
    n/src/plugins/texteditor/../../../lib/qtcreator/plugins/Nokia -lLogger -LC:/P
    rojectII/qt-creator-win/build/src/plugins/texteditor/../../../lib/qtcreator/plug
    ins/Nokia -lLogger -lQtXml4 -lQtGui4 -lQtCore4
    Creating library file: c:\ProjectII\qt-creator-win\build\lib\qtcreator\plugins\N
    okia\libTextEditor.a
    ./release\basetexteditor.o:basetexteditor.cpp.text+0x13cfc): undefined referen
    ce to `XMLProxy::XMLProxy(QString, QString, QString)'
    collect2: ld returned 1 exit status
    mingw32-make[4]: *** [..\..\..\lib\qtcreator\plugins\Nokia\TextEditor.dl l] Error
    1
    mingw32-make[4]: Leaving directory `C:/ProjectII/qt-creator-win/build/src/plugin
    s/texteditor'
    mingw32-make[3]: *** [release] Error 2
    mingw32-make[3]: Leaving directory `C:/ProjectII/qt-creator-win/build/src/plugin
    s/texteditor'
    mingw32-make[2]: *** [sub-texteditor-sub_Release] Error 2
    mingw32-make[2]: Leaving directory `C:/ProjectII/qt-creator-win/build/src/plugin
    s'
    mingw32-make[1]: *** [sub-plugins-sub_Release_ordered] Error 2
    mingw32-make[1]: Leaving directory `C:/ProjectII/qt-creator-win/build/src'
    mingw32-make: *** [sub-src-sub_Release_ordered] Error 2


    while this is my .pro file

    Qt Code:
    1. TEMPLATE = lib
    2. TARGET = Logger
    3. include(../../qtcreatorplugin.pri)
    4. DESTDIR = $$IDE_PLUGIN_PATH/Nokia
    5. PROVIDER = Nokia
    6. include(../../plugins/coreplugin/coreplugin.pri)
    7. HEADERS += LoggerPlugin.h \
    8. xmlproxy.h
    9. SOURCES += LoggerPlugin.cpp \
    10. xmlproxy.cpp
    11. OTHER_FILES += Logger.pluginspec
    To copy to clipboard, switch view to plain text mode 

  8. #8
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    Default Re: "Undefined reference to" in QtCreator plugin

    I would have thought you'd get an undefined reference to XMLProxy::~XMLProxy()
    I can't see the function for that one.

  9. #9
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    Default Re: "Undefined reference to" in QtCreator plugin

    I put it actually in one of my tries but I still got the same error.
    But still if I move all the code into the .h file it works

  10. #10
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    Default Re: "Undefined reference to" in QtCreator plugin

    Maybe look at basetexteditor.h and its relation to XMLProxy.h
    You might need to add an INCLUDEPATH to your pro file to find it. if they are not side by side?


    Added after 30 minutes:


    OK, is the XMLProxy class built? can you see the .o file? Have you built that plugin/lib before you have linked to it?
    My guess is it is working when it is in your header file because it finds your header file, but if you haven't actually built an object to reference to then it won't find the function.
    Last edited by pan; 18th March 2011 at 15:12.

  11. #11
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    Default Re: "Undefined reference to" in QtCreator plugin

    Indeed the only .o file I can see is LoggerPlugin.o in C:\ProjectII\qt-creator-win\build\src\plugins\Logger directory
    The noob question is: How to proceed now?

  12. #12
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    Default Re: "Undefined reference to" in QtCreator plugin

    still can't get it to work, any help?

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