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Basic question: Including headers with INCLUDEPATH doesn't work

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  • B Binary91
    18 Nov 2016, 12:18

    It's getting strange now :-D

    What is a myudp.cpp ?? I didn't ever used this...

    @jsulm
    But you are including the header directly now. That is exaclty what I tried to avoid...

    Why is main.h unusual? I think using headers as a bundle of #include directives for my purposes is the correct way, so in the source file, there only exists one #include directive to its corresponding header file. Not good?

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    jsulm
    Lifetime Qt Champion
    wrote on 18 Nov 2016, 12:22 last edited by
    #38

    @Binary91 That is what you uploaded:

    SOURCES += main.cpp \
        myudp.cpp
    

    main.h is unusual because there is no need for it. You only need a header file if you need to include some functionality provided in one source code file in another one. Where do you want to include main.h and why (and please do not say in main.cpp, because there is no need to do it this way)?
    I will try to change your project to use INCLUDEPATH.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • B Binary91
      18 Nov 2016, 12:18

      It's getting strange now :-D

      What is a myudp.cpp ?? I didn't ever used this...

      @jsulm
      But you are including the header directly now. That is exaclty what I tried to avoid...

      Why is main.h unusual? I think using headers as a bundle of #include directives for my purposes is the correct way, so in the source file, there only exists one #include directive to its corresponding header file. Not good?

      J Offline
      J Offline
      jsulm
      Lifetime Qt Champion
      wrote on 18 Nov 2016, 12:23 last edited by
      #39

      @Binary91 It builds here if I do:

      QT       += core network
      
      QT       -= gui
      
      TARGET = test
      CONFIG   += console
      CONFIG   -= app_bundle
      
      TEMPLATE = app
      
      #INCLUDES += lib/headers/myQLineEdit.h
      INCLUDEPATH += lib/headers
      
      SOURCES += main.cpp
      

      https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • B Offline
        B Offline
        Binary91
        wrote on 18 Nov 2016, 12:26 last edited by
        #40

        I really don't know from where this "myudp.cpp" comes. Maybe a de-zipping error. That should mean "lib/sources/myQLineEdit.cpp"

        Yeah this way its getting built on my computer as well, but there you manually added the header file to the project:
        INCLUDES += ...
        or
        HEADERS +=...

        That is what I try to avoid by using INCLUDEPATH. That was what the discussion is all about...

        J 1 Reply Last reply 18 Nov 2016, 12:28
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        • B Binary91
          18 Nov 2016, 12:26

          I really don't know from where this "myudp.cpp" comes. Maybe a de-zipping error. That should mean "lib/sources/myQLineEdit.cpp"

          Yeah this way its getting built on my computer as well, but there you manually added the header file to the project:
          INCLUDES += ...
          or
          HEADERS +=...

          That is what I try to avoid by using INCLUDEPATH. That was what the discussion is all about...

          J Offline
          J Offline
          jsulm
          Lifetime Qt Champion
          wrote on 18 Nov 2016, 12:28 last edited by
          #41

          @Binary91 Where did I add the header file manually?
          I commented out the old line, please take a look again:

          QT       += core network
          
          QT       -= gui
          
          TARGET = test
          CONFIG   += console
          CONFIG   -= app_bundle
          
          TEMPLATE = app
          
          #INCLUDES += lib/headers/myQLineEdit.h <-- this line is commented out
          INCLUDEPATH += lib/headers
          
          SOURCES += main.cpp
          

          https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • B Offline
            B Offline
            Binary91
            wrote on 18 Nov 2016, 12:32 last edited by
            #42

            but where is the myQLineEdit.cpp ?
            You just added the main.cpp. The error occures in myQLineEdit.cpp, because it holds methods of myQLineEdit class in myQLineEdit.h that has a Q_OBJECT within...

            J 1 Reply Last reply 18 Nov 2016, 12:47
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            • B Binary91
              18 Nov 2016, 12:32

              but where is the myQLineEdit.cpp ?
              You just added the main.cpp. The error occures in myQLineEdit.cpp, because it holds methods of myQLineEdit class in myQLineEdit.h that has a Q_OBJECT within...

              J Offline
              J Offline
              jsulm
              Lifetime Qt Champion
              wrote on 18 Nov 2016, 12:47 last edited by
              #43

              @Binary91 Your project is really broken:

              QT       += core network
              
              QT       += gui widgets
              
              TARGET = test
              CONFIG   += console
              CONFIG   -= app_bundle
              
              TEMPLATE = app
              
              HEADERS += lib/headers/myQLineEdit.h
              INCLUDEPATH += lib/headers
              
              SOURCES += main.cpp \
                  lib/sources/myQLineEdit.cpp
              

              myQLineEdit.cpp

              #include <myQLineEdit.h> // absolute path or absolute path with whitespaces also doesn't work
              
              
              // ----- constructors -----
              
              myQLineEdit::myQLineEdit(QWidget* widgetParent) : QLineEdit(widgetParent)
              {
                 // stuff
              }
              
              myQLineEdit::~myQLineEdit()
              {
              
              }
              
              #include "../build-test-Desktop-Debug/moc_myQLineEdit.cpp"
              

              Without HEADERS moc_ file is not generated and the header file is not shown in QtCreator, so you should use HEADERS.

              https://forum.qt.io/topic/113070/qt-code-of-conduct

              J 1 Reply Last reply 18 Nov 2016, 12:55
              0
              • J jsulm
                18 Nov 2016, 12:47

                @Binary91 Your project is really broken:

                QT       += core network
                
                QT       += gui widgets
                
                TARGET = test
                CONFIG   += console
                CONFIG   -= app_bundle
                
                TEMPLATE = app
                
                HEADERS += lib/headers/myQLineEdit.h
                INCLUDEPATH += lib/headers
                
                SOURCES += main.cpp \
                    lib/sources/myQLineEdit.cpp
                

                myQLineEdit.cpp

                #include <myQLineEdit.h> // absolute path or absolute path with whitespaces also doesn't work
                
                
                // ----- constructors -----
                
                myQLineEdit::myQLineEdit(QWidget* widgetParent) : QLineEdit(widgetParent)
                {
                   // stuff
                }
                
                myQLineEdit::~myQLineEdit()
                {
                
                }
                
                #include "../build-test-Desktop-Debug/moc_myQLineEdit.cpp"
                

                Without HEADERS moc_ file is not generated and the header file is not shown in QtCreator, so you should use HEADERS.

                J Offline
                J Offline
                jsulm
                Lifetime Qt Champion
                wrote on 18 Nov 2016, 12:55 last edited by
                #44

                @jsulm said in Basic question: Including headers with INCLUDEPATH doesn't work:

                #include "../build-test-Desktop-Debug/moc_myQLineEdit.cpp"

                you can change it to:

                #include "moc_myQLineEdit.cpp"
                

                It builds now on my machine.

                https://forum.qt.io/topic/113070/qt-code-of-conduct

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                • B Buckwheat
                  18 Nov 2016, 12:09

                  @jsulm , why would you include the MOC files? I "never" include the MOC files in my source because they get generated, compiled, and linked after the normal build. The only generated file I would include is the ui_NameOfForm.h file created when using the form designer. And, only in the CPP for the UI class.

                  @Binary91 , I am sure it was explained that INCLUDEPATH tells qmake where to find common include files. I use it for 3rd party libraries or pre-built packages I developed for Qt (I treat them like 3rd party libraries). And, as I know you know... always run qmake after changing a PRO file.

                  There is one curious item I have found about QtCreator though... if you are using static libraries (even if your dependencies are setup) and make a change to a CPP file in the library... Press build-all and it will build the library and NOT re-link the application or shared library that depends on that static library. Kind of annoying but I just get around it!

                  J Offline
                  J Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on 18 Nov 2016, 12:58 last edited by
                  #45

                  @Buckwheat You need to include moc_ files for your own classes which are derived from QObject (directly or indirectly).

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  B 1 Reply Last reply 22 Nov 2016, 12:48
                  0
                  • B Offline
                    B Offline
                    Binary91
                    wrote on 20 Nov 2016, 09:08 last edited by
                    #46

                    Hi jsulm,

                    so you say, I need to include the headers with HEADERS in the project file. Well, then I'm asking myself what the INCLUDEPATH command is for?

                    M 1 Reply Last reply 20 Nov 2016, 09:34
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                    • B Binary91
                      20 Nov 2016, 09:08

                      Hi jsulm,

                      so you say, I need to include the headers with HEADERS in the project file. Well, then I'm asking myself what the INCLUDEPATH command is for?

                      M Offline
                      M Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on 20 Nov 2016, 09:34 last edited by mrjj
                      #47

                      @Binary91 said in Basic question: Including headers with INCLUDEPATH doesn't work:

                      INCLUDEPATH
                      http://doc.qt.io/qt-5/qmake-variable-reference.html#includepath

                      Its used to specify where to look for headers.
                      So when it sees #include "YYYY" it will search for them there.

                      as shown with

                      INCLUDEPATH += ../../Common/CONET
                      ../../Common/XML/pugixml-1.5/src/ \

                      the pugixml.h is in the src and i can just use
                      it like
                      #include "pugixml.h"

                      Without it I would have to do use full path to it.

                      That is its role and it works fine here.

                      You seem to expect that point to a folder with INCLUDEPATH,
                      implies that all should be used ?

                      Like all where already added to HEADERS ?

                      There is one issue if it did that.
                      For all HEADERS , it need to run moc on them so
                      if you use INCLUDEPATH to point to a place with many .H files
                      you be wasting tons of time running moc on those completely unrelated files.
                      Hence HEADERS tells us what files to run moc on.
                      Of course this could be fixed checking against which are actually seen via #include
                      but it's not the way it works currently. :)

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                      • B Offline
                        B Offline
                        Binary91
                        wrote on 20 Nov 2016, 22:13 last edited by
                        #48

                        thank you mrjj, that was the explanation I was looking for!

                        I didn't know that with HEADERS I tell the compiler which moc files should be generated!

                        So all in all, I have to include those headers to my project and everything is going well.

                        Thank you for your help.

                        Kind regards,
                        Binary

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                        • J jsulm
                          18 Nov 2016, 12:58

                          @Buckwheat You need to include moc_ files for your own classes which are derived from QObject (directly or indirectly).

                          B Offline
                          B Offline
                          Buckwheat
                          wrote on 22 Nov 2016, 12:48 last edited by
                          #49

                          @jsulm Actually you don't. When the build system sees the Q_OBJECT, it will build and compile a MOC file for you. It will link into the application and be part of it. No inclusion is necessary. None at all. The only think you would ever include is a form generated header file (ie. ui_MainWindow.h) that will hold the form variables for you.

                          If doubting, watch your build on any system. You will see the CPP files compile and then the moc_*.cpp files compile and then the linker will have both on it. The MOC files tie your class to the signal/slots and meta object data all under the scenes. It is quite beautifully designed.

                          Dave Fileccia

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                          • S Offline
                            S Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on 22 Nov 2016, 22:04 last edited by
                            #50

                            If your QObject based class is in a .cpp file then you need to include the moc file at the bottom. See the unit tests form Qt for example.

                            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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                            20 Nov 2016, 09:34

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