Using Custom Designer Widgets



  • I have completed all the tutorials that shows how to make a custom widget for Qt Designer, and the custom widget is showing up fine in Qt Designer.

    An example is the AnalogClock tutorial. When I make a new project and drags in AnalogClock widget into my main window, this works fine.

    I then make a pri file with this content:
    INCLUDEPATH += $$PWD
    HEADERS += $$PWD/analogclock.h
    SOURCES += $$PWD/analogclock.cpp

    and copies the analogclock.h and .cpp files intop my project folder.

    When I tries to compile it, I get this:

    mainwindow.obj : error LNK2001: unresolved external symbol "protected: virtual void __thiscall AnalogClock::paintEvent(class QPaintEvent *)" (?paintEvent@AnalogClock@@MAEXPAVQPaintEvent@@@Z)
    mainwindow.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall AnalogClock::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@AnalogClock@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
    mainwindow.obj : error LNK2001: unresolved external symbol "public: virtual void * __thiscall AnalogClock::qt_metacast(char const *)" (?qt_metacast@AnalogClock@@UAEPAXPBD@Z)
    debug\test7.exe : fatal error LNK1120: 6 unresolved externals
    jom: C:\Users\MyrvoldI\Documents\Qt\build-test7-Desktop_Qt_5_3_MSVC2013_32bit-Debug\Makefile.Debug [debug\test7.exe] Error 1120
    jom: C:\Users\MyrvoldI\Documents\Qt\build-test7-Desktop_Qt_5_3_MSVC2013_32bit-Debug\Makefile [debug] Error 2
    12:12:32: The process "C:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
    Error while building/deploying project test7 (kit: Desktop Qt 5.3 MSVC2013 32bit)
    When executing step "Make"
    12:12:32: Elapsed time: 00:02.



  • This may sound silly but are you working with the .pri file or the .pro file? .pri files are used when dealing with subdir projects.If it is just one project you should add your project file directivew to a .pro file

    Hope this helps.



  • Also your code and compiler output in your posts is more readable when you wrap them within " ``` " tags :-)



  • @musimbate

    I just followed the documentation here: http://doc.qt.io/qt-5/designer-creating-custom-widgets.html where it says to create a .pri file.

    But I tried your suggestion to add the analogclock.h and .cpp to the headers and source in the .pro file, and now I get this compiler output:

    14:22:19: Starting: "C:\Qt\5.3\msvc2013\bin\qmake.exe" C:\Users\MyrvoldI\Documents\Qt\test7\test7.pro -r -spec win32-msvc2013 "CONFIG+=debug"
    14:22:19: The process "C:\Qt\5.3\msvc2013\bin\qmake.exe" exited normally.
    14:22:19: Starting: "C:\Qt\Tools\QtCreator\bin\jom.exe" 
    C:\Qt\Tools\QtCreator\bin\jom.exe -f Makefile.Debug
    C:\Qt\5.3\msvc2013\bin\uic.exe ..\test7\mainwindow.ui -o ui_mainwindow.h
    cl -c -nologo -Zm200 -Zc:wchar_t -FS -Zi -MDd -GR -W3 -w34100 -w34189 -EHsc /Fddebug\test7.pdb -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -I"C:\Qt\5.3\msvc2013\include" -I"C:\Qt\5.3\msvc2013\include\QtWidgets" -I"C:\Qt\5.3\msvc2013\include\QtGui" -I"C:\Qt\5.3\msvc2013\include\QtANGLE" -I"C:\Qt\5.3\msvc2013\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.3\msvc2013\mkspecs\win32-msvc2013" -Fodebug\ @C:\Users\MyrvoldI\AppData\Local\Temp\main.obj.18096.15.jom
    cl -c -nologo -Zm200 -Zc:wchar_t -FS -Zi -MDd -GR -W3 -w34100 -w34189 -EHsc /Fddebug\test7.pdb -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -I"C:\Qt\5.3\msvc2013\include" -I"C:\Qt\5.3\msvc2013\include\QtWidgets" -I"C:\Qt\5.3\msvc2013\include\QtGui" -I"C:\Qt\5.3\msvc2013\include\QtANGLE" -I"C:\Qt\5.3\msvc2013\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.3\msvc2013\mkspecs\win32-msvc2013" -Fodebug\ @C:\Users\MyrvoldI\AppData\Local\Temp\analogclock.obj.18096.31.jom
    C:\Qt\5.3\msvc2013\bin\moc.exe -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -D_MSC_VER=1800 -D_WIN32 -IC:/Qt/5.3/msvc2013/mkspecs/win32-msvc2013 -IC:/Users/MyrvoldI/Documents/Qt/test7 -IC:/Qt/5.3/msvc2013/include -IC:/Qt/5.3/msvc2013/include/QtWidgets -IC:/Qt/5.3/msvc2013/include/QtGui -IC:/Qt/5.3/msvc2013/include/QtANGLE -IC:/Qt/5.3/msvc2013/include/QtCore -I. ..\test7\mainwindow.h -o debug\moc_mainwindow.cpp
    C:\Qt\5.3\msvc2013\bin\moc.exe -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -D_MSC_VER=1800 -D_WIN32 -IC:/Qt/5.3/msvc2013/mkspecs/win32-msvc2013 -IC:/Users/MyrvoldI/Documents/Qt/test7 -IC:/Qt/5.3/msvc2013/include -IC:/Qt/5.3/msvc2013/include/QtWidgets -IC:/Qt/5.3/msvc2013/include/QtGui -IC:/Qt/5.3/msvc2013/include/QtANGLE -IC:/Qt/5.3/msvc2013/include/QtCore -I. ..\test7\analogclock.h -o debug\moc_analogclock.cpp
    analogclock.cpp
    main.cpp
    cl -c -nologo -Zm200 -Zc:wchar_t -FS -Zi -MDd -GR -W3 -w34100 -w34189 -EHsc /Fddebug\test7.pdb -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -I"C:\Qt\5.3\msvc2013\include" -I"C:\Qt\5.3\msvc2013\include\QtWidgets" -I"C:\Qt\5.3\msvc2013\include\QtGui" -I"C:\Qt\5.3\msvc2013\include\QtANGLE" -I"C:\Qt\5.3\msvc2013\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.3\msvc2013\mkspecs\win32-msvc2013" -Fodebug\ @C:\Users\MyrvoldI\AppData\Local\Temp\mainwindow.obj.18096.47.jom
    mainwindow.cpp
    cl -c -nologo -Zm200 -Zc:wchar_t -FS -Zi -MDd -GR -W3 -w34100 -w34189 -EHsc /Fddebug\test7.pdb -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -I"C:\Qt\5.3\msvc2013\include" -I"C:\Qt\5.3\msvc2013\include\QtWidgets" -I"C:\Qt\5.3\msvc2013\include\QtGui" -I"C:\Qt\5.3\msvc2013\include\QtANGLE" -I"C:\Qt\5.3\msvc2013\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.3\msvc2013\mkspecs\win32-msvc2013" -Fodebug\ @C:\Users\MyrvoldI\AppData\Local\Temp\moc_analogclock.obj.18096.171.jom
    moc_analogclock.cpp
    debug\moc_analogclock.cpp(55) : warning C4273: 'AnalogClock::qt_static_metacall' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\build-test7-desktop_qt_5_3_msvc2013_32bit-debug\debug\../../test7/analogclock.h(9) : see previous definition of 'qt_static_metacall'
    debug\moc_analogclock.cpp(62) : warning C4273: 'staticMetaObject' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\build-test7-desktop_qt_5_3_msvc2013_32bit-debug\debug\../../test7/analogclock.h(9) : see previous definition of 'public: static QMetaObject const AnalogClock::staticMetaObject'
    debug\moc_analogclock.cpp(62) : error C2491: 'AnalogClock::staticMetaObject' : definition of dllimport static data member not allowed
    debug\moc_analogclock.cpp(69) : warning C4273: 'AnalogClock::metaObject' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\build-test7-desktop_qt_5_3_msvc2013_32bit-debug\debug\../../test7/analogclock.h(9) : see previous definition of 'metaObject'
    debug\moc_analogclock.cpp(74) : warning C4273: 'AnalogClock::qt_metacast' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\build-test7-desktop_qt_5_3_msvc2013_32bit-debug\debug\../../test7/analogclock.h(9) : see previous definition of 'qt_metacast'
    debug\moc_analogclock.cpp(82) : warning C4273: 'AnalogClock::qt_metacall' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\build-test7-desktop_qt_5_3_msvc2013_32bit-debug\debug\../../test7/analogclock.h(9) : see previous definition of 'qt_metacall'
    jom: C:\Users\MyrvoldI\Documents\Qt\build-test7-Desktop_Qt_5_3_MSVC2013_32bit-Debug\Makefile.Debug [debug\moc_analogclock.obj] Error 2
    cl -c -nologo -Zm200 -Zc:wchar_t -FS -Zi -MDd -GR -W3 -w34100 -w34189 -EHsc /Fddebug\test7.pdb -DUNICODE -DWIN32 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENGL_ES_2 -DQT_OPENGL_ES_2_ANGLE -I"C:\Qt\5.3\msvc2013\include" -I"C:\Qt\5.3\msvc2013\include\QtWidgets" -I"C:\Qt\5.3\msvc2013\include\QtGui" -I"C:\Qt\5.3\msvc2013\include\QtANGLE" -I"C:\Qt\5.3\msvc2013\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.3\msvc2013\mkspecs\win32-msvc2013" -Fodebug\ @C:\Users\MyrvoldI\AppData\Local\Temp\moc_mainwindow.obj.18096.171.jom
    moc_mainwindow.cpp
    ..\test7\analogclock.cpp(5) : warning C4273: 'AnalogClock::AnalogClock' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\test7\analogclock.h(12) : see previous definition of '{ctor}'
    ..\test7\analogclock.cpp(17) : warning C4273: 'AnalogClock::paintEvent' : inconsistent dll linkage
           c:\users\myrvoldi\documents\qt\test7\analogclock.h(15) : see previous definition of 'paintEvent'
    jom: C:\Users\MyrvoldI\Documents\Qt\build-test7-Desktop_Qt_5_3_MSVC2013_32bit-Debug\Makefile [debug] Error 2
    14:22:22: The process "C:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
    Error while building/deploying project test7 (kit: Desktop Qt 5.3 MSVC2013 32bit)
    When executing step "Make"
    14:22:22: Elapsed time: 00:03.```

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