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As dynamic libraries to use class variables?

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  • M Offline
    M Offline
    Mikee
    wrote on last edited by
    #9

    In the library :

    #include "C:\\Qt\project\\MyCandleSrick\\mainwindow.h"
    

    error:
    C:\Qt\project\MyCandleSrick\mainwindow.h:4: error: QMainWindow: No such file or directory

    mrjjM 1 Reply Last reply
    0
    • M Mikee

      In the library :

      #include "C:\\Qt\project\\MyCandleSrick\\mainwindow.h"
      

      error:
      C:\Qt\project\MyCandleSrick\mainwindow.h:4: error: QMainWindow: No such file or directory

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #10

      @Mikee
      Well what is on line 4 in mainwindow.h ?
      It says it cant find what ever you include there.

      1 Reply Last reply
      0
      • mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #11

        Hi
        You should use
        http://doc.qt.io/qt-5/qmake-variable-reference.html#includepath

        instead of linking to the file with full path

        1 Reply Last reply
        0
        • M Offline
          M Offline
          Mikee
          wrote on last edited by
          #12

          4: #include <QMainWindow>
          I have no patch, I have a dynamic library.

          1 Reply Last reply
          0
          • M Offline
            M Offline
            Mikee
            wrote on last edited by
            #13

            May be need use http://doc.qt.io/Qt-5/qlocalsocket.html ?

            mrjjM 1 Reply Last reply
            0
            • M Mikee

              May be need use http://doc.qt.io/Qt-5/qlocalsocket.html ?

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #14

              @Mikee
              not a patch, a path
              you include with
              #include "C:\Qt\project\MyCandleSrick\mainwindow.h"

              then in THAT mainwindow.h, if it tries to include something else
              it will look in the folder with the .pro file for the current project and
              will know nothing about MyCandleSrick folder.

              So im saying:
              it will not work good for you to include using full paths, it will not be able to find other files.
              and hence you should tell it with
              http://doc.qt.io/qt-5/qmake-variable-reference.html#includepath
              where ALSO to look for other files.
              Else it will miss what ever mainwindow.h also includes.

              1 Reply Last reply
              0
              • M Offline
                M Offline
                Mikee
                wrote on last edited by Mikee
                #15

                It is my *.pro file. What to do next?

                QT       -= gui
                
                TARGET = StrategyCod
                TEMPLATE = lib
                
                DEFINES += STRATEGYCOD_LIBRARY
                DEFINES += QT_DEPRECATED_WARNINGS
                
                SOURCES += \
                        strategycod.cpp
                
                HEADERS += \
                        strategycod.h \
                        strategycod_global.h 
                
                unix {
                    target.path = /usr/lib
                    INSTALLS += target
                }
                
                INCLUDEPATH = c : / mainwindow.h/include
                
                mrjjM 1 Reply Last reply
                0
                • M Mikee

                  It is my *.pro file. What to do next?

                  QT       -= gui
                  
                  TARGET = StrategyCod
                  TEMPLATE = lib
                  
                  DEFINES += STRATEGYCOD_LIBRARY
                  DEFINES += QT_DEPRECATED_WARNINGS
                  
                  SOURCES += \
                          strategycod.cpp
                  
                  HEADERS += \
                          strategycod.h \
                          strategycod_global.h 
                  
                  unix {
                      target.path = /usr/lib
                      INSTALLS += target
                  }
                  
                  INCLUDEPATH = c : / mainwindow.h/include
                  
                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #16

                  @Mikee said in As dynamic libraries to use class variables?:

                  INCLUDEPATH = c : / mainwindow.h/include

                  That is complete wrong syntax ?

                  INCLUDEPATH = "C:/Qt/project/MyCandleSrick"

                  if that is the folder where it should look for the other files.

                  1 Reply Last reply
                  0
                  • M Offline
                    M Offline
                    Mikee
                    wrote on last edited by
                    #17

                    I replaced. What to do next?

                    QT       -= gui
                    
                    TARGET = StrategyCod
                    TEMPLATE = lib
                    
                    DEFINES += STRATEGYCOD_LIBRARY
                    DEFINES += QT_DEPRECATED_WARNINGS
                    SOURCES += \
                            strategycod.cpp
                    
                    HEADERS += \
                            strategycod.h \
                            strategycod_global.h 
                    
                    unix {
                        target.path = /usr/lib
                        INSTALLS += target
                    }
                    
                    #INCLUDEPATH = C: / Qt / project / MyCandleSrick/include
                    INCLUDEPATH = "C: / Qt / project / MyCandleSrick"
                    
                    mrjjM 1 Reply Last reply
                    0
                    • M Mikee

                      I replaced. What to do next?

                      QT       -= gui
                      
                      TARGET = StrategyCod
                      TEMPLATE = lib
                      
                      DEFINES += STRATEGYCOD_LIBRARY
                      DEFINES += QT_DEPRECATED_WARNINGS
                      SOURCES += \
                              strategycod.cpp
                      
                      HEADERS += \
                              strategycod.h \
                              strategycod_global.h 
                      
                      unix {
                          target.path = /usr/lib
                          INSTALLS += target
                      }
                      
                      #INCLUDEPATH = C: / Qt / project / MyCandleSrick/include
                      INCLUDEPATH = "C: / Qt / project / MyCandleSrick"
                      
                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #18

                      @Mikee said in As dynamic libraries to use class variables?:

                      INCLUDEPATH = "C: / Qt / project / MyCandleSrick"

                      Why the spaces ?
                      Seems not correct.

                      -What to do next?
                      Depends on what you are trying ?
                      If you can now build your library and get a DLL
                      then you should load that library in your main app and
                      try to call function StrategyCod2 with your data.

                      https://wiki.qt.io/How_to_create_a_library_with_Qt_and_use_it_in_an_application
                      See section "Loading the library using QLibrary"

                      Since you are not exporting void StrategyCod2()
                      you need to resolve it to call it.
                      http://doc.qt.io/qt-5/qlibrary.html#resolve

                      1 Reply Last reply
                      0
                      • M Offline
                        M Offline
                        Mikee
                        wrote on last edited by
                        #19

                        This is my library:
                        StrategyCod.pro:

                        QT       -= gui
                        
                        TARGET = StrategyCod
                        TEMPLATE = lib
                        
                        DEFINES += STRATEGYCOD_LIBRARY
                        
                        # The following define makes your compiler emit warnings if you use
                        # any feature of Qt which has been marked as deprecated (the exact warnings
                        # depend on your compiler). Please consult the documentation of the
                        # deprecated API in order to know how to port your code away from it.
                        DEFINES += QT_DEPRECATED_WARNINGS
                        
                        # You can also make your code fail to compile if you use deprecated APIs.
                        # In order to do so, uncomment the following line.
                        # You can also select to disable deprecated APIs only up to a certain version of Qt.
                        #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                        
                        SOURCES += \
                                strategycod.cpp
                        
                        HEADERS += \
                                strategycod.h \
                                strategycod_global.h 
                        
                        unix {
                            target.path = /usr/lib
                            INSTALLS += target
                        }
                        
                        #INCLUDEPATH = C: / Qt / project / MyCandleSrick/include
                        INCLUDEPATH = "C:/Qt/project/MyCandleSrick"
                        

                        strategycod.h:

                        #ifndef STRATEGYCOD_H
                        #define STRATEGYCOD_H
                        
                        #include "strategycod_global.h"
                        
                        
                        extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod();}
                        
                        class STRATEGYCODSHARED_EXPORT StrategyCod
                        {
                        
                        //public:
                           // StrategyCod1();
                        };
                        
                        #endif // STRATEGYCOD_H
                        
                        

                        strategycod_global.h:

                        #ifndef STRATEGYCOD_GLOBAL_H
                        #define STRATEGYCOD_GLOBAL_H
                        
                        #include <QtCore/qglobal.h>
                        
                        #if defined(STRATEGYCOD_LIBRARY)
                        #  define STRATEGYCODSHARED_EXPORT Q_DECL_EXPORT
                        #else
                        #  define STRATEGYCODSHARED_EXPORT Q_DECL_IMPORT
                        #endif
                        
                        #endif // STRATEGYCOD_GLOBAL_H
                        

                        strategycod.cpp:

                        #include "strategycod.h"
                        #include <QDebug>
                        //#include "C:\\Qt\project\\MyCandleSrick\\mainwindow.h"
                        //#include <mainwindow>
                        //StrategyCod::StrategyCod1(){qDebug()<<"Library work1";}
                        
                        
                        
                        void StrategyCod()
                        {
                            //MainWindow w;
                            qDebug()<<"Library work2";//<<w.NBar;
                        }
                        

                        This is my app
                        main.cpp

                        #include "mainwindow.h"
                        #include <QApplication>
                        #include <cstdlib>
                        #include <QMessageBox>
                        #include <QtConcurrent/QtConcurrent>
                        #include <QMutex>
                        int main(int argc, char *argv[])
                        {
                            QApplication a(argc, argv);
                            MainWindow w;    
                            QLibrary MyLib("C:\\Qt\\project\\build-StrategyCod-Desktop_Qt_5_9_2_MinGW_32bit-Debug\\debug\\StrategyCod"); 
                            MyLib.load();
                            typedef void (*MyPrototype)();
                            MyPrototype StrategyCod = (MyPrototype) MyLib.resolve("StrategyCod");
                            StrategyCod();  
                            MyLib.unload();
                            w.show();
                            return a.exec();
                        }
                        

                        In the MainWindow class is written needed variables.
                        But I can not create an object of MainWindow class in the library and can't use its variables.

                        mrjjM 1 Reply Last reply
                        0
                        • M Mikee

                          This is my library:
                          StrategyCod.pro:

                          QT       -= gui
                          
                          TARGET = StrategyCod
                          TEMPLATE = lib
                          
                          DEFINES += STRATEGYCOD_LIBRARY
                          
                          # The following define makes your compiler emit warnings if you use
                          # any feature of Qt which has been marked as deprecated (the exact warnings
                          # depend on your compiler). Please consult the documentation of the
                          # deprecated API in order to know how to port your code away from it.
                          DEFINES += QT_DEPRECATED_WARNINGS
                          
                          # You can also make your code fail to compile if you use deprecated APIs.
                          # In order to do so, uncomment the following line.
                          # You can also select to disable deprecated APIs only up to a certain version of Qt.
                          #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                          
                          SOURCES += \
                                  strategycod.cpp
                          
                          HEADERS += \
                                  strategycod.h \
                                  strategycod_global.h 
                          
                          unix {
                              target.path = /usr/lib
                              INSTALLS += target
                          }
                          
                          #INCLUDEPATH = C: / Qt / project / MyCandleSrick/include
                          INCLUDEPATH = "C:/Qt/project/MyCandleSrick"
                          

                          strategycod.h:

                          #ifndef STRATEGYCOD_H
                          #define STRATEGYCOD_H
                          
                          #include "strategycod_global.h"
                          
                          
                          extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod();}
                          
                          class STRATEGYCODSHARED_EXPORT StrategyCod
                          {
                          
                          //public:
                             // StrategyCod1();
                          };
                          
                          #endif // STRATEGYCOD_H
                          
                          

                          strategycod_global.h:

                          #ifndef STRATEGYCOD_GLOBAL_H
                          #define STRATEGYCOD_GLOBAL_H
                          
                          #include <QtCore/qglobal.h>
                          
                          #if defined(STRATEGYCOD_LIBRARY)
                          #  define STRATEGYCODSHARED_EXPORT Q_DECL_EXPORT
                          #else
                          #  define STRATEGYCODSHARED_EXPORT Q_DECL_IMPORT
                          #endif
                          
                          #endif // STRATEGYCOD_GLOBAL_H
                          

                          strategycod.cpp:

                          #include "strategycod.h"
                          #include <QDebug>
                          //#include "C:\\Qt\project\\MyCandleSrick\\mainwindow.h"
                          //#include <mainwindow>
                          //StrategyCod::StrategyCod1(){qDebug()<<"Library work1";}
                          
                          
                          
                          void StrategyCod()
                          {
                              //MainWindow w;
                              qDebug()<<"Library work2";//<<w.NBar;
                          }
                          

                          This is my app
                          main.cpp

                          #include "mainwindow.h"
                          #include <QApplication>
                          #include <cstdlib>
                          #include <QMessageBox>
                          #include <QtConcurrent/QtConcurrent>
                          #include <QMutex>
                          int main(int argc, char *argv[])
                          {
                              QApplication a(argc, argv);
                              MainWindow w;    
                              QLibrary MyLib("C:\\Qt\\project\\build-StrategyCod-Desktop_Qt_5_9_2_MinGW_32bit-Debug\\debug\\StrategyCod"); 
                              MyLib.load();
                              typedef void (*MyPrototype)();
                              MyPrototype StrategyCod = (MyPrototype) MyLib.resolve("StrategyCod");
                              StrategyCod();  
                              MyLib.unload();
                              w.show();
                              return a.exec();
                          }
                          

                          In the MainWindow class is written needed variables.
                          But I can not create an object of MainWindow class in the library and can't use its variables.

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #20

                          Hi
                          Ok, and you can call the void StrategyCod() function ? ( that works ?)
                          If yes, you can now
                          make it into

                          void StrategyCod(MainWinow *main) ( it should know the type since u include its .h file)
                          extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow *main);}

                          and from main call it with
                          typedef void (*MyPrototype)((MainWinow *);
                          MyPrototype StrategyCod = (MyPrototype) MyLib.resolve("StrategyCod");
                          StrategyCod(&w); // give it the real MainWindow

                          There is no reason to try to create a new MainWindow inside the StrategyCod() function as
                          that would be ANOTHER mainwindow than the running one and not have the right data.

                          You should give it as parameter.

                          Using mainwindow seems silly, a Data class would make more sense but can work.
                          But you should NOT call any functions inside mainwindow from library as there is no event loop running and
                          it will not work. But you should be able to use public member variables.

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                          0
                          • M Offline
                            M Offline
                            Mikee
                            wrote on last edited by
                            #21

                            I can call the void StrategyCod() .
                            I did:
                            strategycod.h:

                            #ifndef STRATEGYCOD_H
                            #define STRATEGYCOD_H
                            
                            #include "strategycod_global.h"
                            
                            
                            extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                            
                            class STRATEGYCODSHARED_EXPORT StrategyCod
                            {
                            
                            //public:
                               // StrategyCod1();
                            };
                            
                            #endif // STRATEGYCOD_H
                            

                            strategycod.cpp:

                            #include "strategycod.h"
                            #include <QDebug>
                            //#include "C:\\Qt\project\\MyCandleSrick\\mainwindow.h"
                            //#include <mainwindow>
                            //StrategyCod::StrategyCod1(){qDebug()<<"Library work1";}
                            
                            
                            
                            void StrategyCod(MainWinow * main)
                            {
                                //MainWindow w;
                                qDebug()<<"Library work2";//<<w.NBar;
                            }
                            

                            6 errors:
                            C:\Qt\project\StrategyCod\strategycod.h:7: error: variable or field 'StrategyCod' declared void
                            extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                            ^
                            C:\Qt\project\StrategyCod\strategycod.h:7: error: 'MainWinow' was not declared in this scope
                            C:\Qt\project\StrategyCod\strategycod.h:7: error: 'main' was not declared in this scope
                            extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                            ^
                            C:\Qt\project\StrategyCod\strategycod.cpp:9: оerror: variable or field 'StrategyCod' declared void
                            void StrategyCod(MainWinow * main)
                            ^
                            C:\Qt\project\StrategyCod\strategycod.cpp:9: error: 'MainWinow' was not declared in this scope
                            C:\Qt\project\StrategyCod\strategycod.cpp:9: error: 'main' was not declared in this scope
                            void StrategyCod(MainWinow * main)
                            ^

                            mrjjM 1 Reply Last reply
                            0
                            • M Mikee

                              I can call the void StrategyCod() .
                              I did:
                              strategycod.h:

                              #ifndef STRATEGYCOD_H
                              #define STRATEGYCOD_H
                              
                              #include "strategycod_global.h"
                              
                              
                              extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                              
                              class STRATEGYCODSHARED_EXPORT StrategyCod
                              {
                              
                              //public:
                                 // StrategyCod1();
                              };
                              
                              #endif // STRATEGYCOD_H
                              

                              strategycod.cpp:

                              #include "strategycod.h"
                              #include <QDebug>
                              //#include "C:\\Qt\project\\MyCandleSrick\\mainwindow.h"
                              //#include <mainwindow>
                              //StrategyCod::StrategyCod1(){qDebug()<<"Library work1";}
                              
                              
                              
                              void StrategyCod(MainWinow * main)
                              {
                                  //MainWindow w;
                                  qDebug()<<"Library work2";//<<w.NBar;
                              }
                              

                              6 errors:
                              C:\Qt\project\StrategyCod\strategycod.h:7: error: variable or field 'StrategyCod' declared void
                              extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                              ^
                              C:\Qt\project\StrategyCod\strategycod.h:7: error: 'MainWinow' was not declared in this scope
                              C:\Qt\project\StrategyCod\strategycod.h:7: error: 'main' was not declared in this scope
                              extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                              ^
                              C:\Qt\project\StrategyCod\strategycod.cpp:9: оerror: variable or field 'StrategyCod' declared void
                              void StrategyCod(MainWinow * main)
                              ^
                              C:\Qt\project\StrategyCod\strategycod.cpp:9: error: 'MainWinow' was not declared in this scope
                              C:\Qt\project\StrategyCod\strategycod.cpp:9: error: 'main' was not declared in this scope
                              void StrategyCod(MainWinow * main)
                              ^

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #22

                              Hi
                              You must include mainwindw.h so it knows type

                              trategycod.cpp:
                              #include "mainwindow.h" // should know where to find it due to the INCLUDEPATH in .pro file

                              1 Reply Last reply
                              1
                              • M Offline
                                M Offline
                                Mikee
                                wrote on last edited by Mikee
                                #23

                                When i do this same error appers:
                                C:\Qt\project\MyCandleSrick\mainwindow.h:4: error: QMainWindow: No such file or directory

                                In the file C:/Qt/project/MyCandleSrick/mainwindow.h:
                                4:#include <QMainWindow>

                                mrjjM 1 Reply Last reply
                                0
                                • M Mikee

                                  When i do this same error appers:
                                  C:\Qt\project\MyCandleSrick\mainwindow.h:4: error: QMainWindow: No such file or directory

                                  In the file C:/Qt/project/MyCandleSrick/mainwindow.h:
                                  4:#include <QMainWindow>

                                  mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on last edited by mrjj
                                  #24

                                  @Mikee
                                  Well you library is with

                                  QT -= gui

                                  so it dont know QMainwindow type ( or any Qt widget type)

                                  1 Reply Last reply
                                  1
                                  • M Offline
                                    M Offline
                                    Mikee
                                    wrote on last edited by
                                    #25

                                    I fixed strategycod.pro:

                                    QT       += core gui
                                    
                                    TARGET = StrategyCod
                                    TEMPLATE = lib
                                    
                                    DEFINES += STRATEGYCOD_LIBRARY
                                    DEFINES += QT_DEPRECATED_WARNINGS
                                    SOURCES += \
                                            strategycod.cpp
                                    
                                    HEADERS += \
                                            strategycod.h \
                                            strategycod_global.h 
                                    
                                    unix {
                                        target.path = /usr/lib
                                        INSTALLS += target
                                    }
                                    INCLUDEPATH = "C:/Qt/project/MyCandleSrick"
                                    

                                    But the error is the same.

                                    1 Reply Last reply
                                    0
                                    • M Offline
                                      M Offline
                                      Mikee
                                      wrote on last edited by
                                      #26

                                      I done this in strategycod.pro

                                      INCLUDEPATH = "C:/Qt/project/MyCandleSrick"  "C:/Qt/Qt5.9.2/5.9.2/Src/qtbase/include/QtWidgets"
                                      

                                      Now it included <QMainWindow>. But it isnt working now

                                      extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                                      

                                      and

                                      void StrategyCod(MainWinow * main)
                                      

                                      errors:
                                      C:\Qt\project\StrategyCod\strategycod.h:7: error: variable or field 'StrategyCod' declared void
                                      extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                                      ^
                                      C:\Qt\project\StrategyCod\strategycod.h:7: error: 'MainWinow' was not declared in this scope
                                      C:\Qt\project\StrategyCod\strategycod.h:7: error: 'main' was not declared in this scope
                                      extern "C" {STRATEGYCODSHARED_EXPORT void StrategyCod(MainWinow * main);}
                                      ^
                                      C:\Qt\project\StrategyCod\strategycod.cpp:9: оerror: variable or field 'StrategyCod' declared void
                                      void StrategyCod(MainWinow * main)
                                      ^
                                      C:\Qt\project\StrategyCod\strategycod.cpp:9: error: 'MainWinow' was not declared in this scope
                                      C:\Qt\project\StrategyCod\strategycod.cpp:9: error: 'main' was not declared in this scope
                                      void StrategyCod(MainWinow * main)

                                      1 Reply Last reply
                                      0
                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #27

                                        Because when you do INCLUDEPATH = you replace the content of that variable with what follows. Use INCLUDEPATH += to append your folders to it.

                                        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
                                        2
                                        • M Offline
                                          M Offline
                                          Mikee
                                          wrote on last edited by
                                          #28

                                          Now all includes are working.
                                          When I use function

                                          void StrategyCod(MainWindow * main)
                                          {
                                              //MainWindow w;
                                              main->NBar;
                                              qDebug()<<"Library work2"<<main->NBar;//<<w.NBar;
                                          }
                                          

                                          qDebug message is not a valid value NBar

                                          1 Reply Last reply
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