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unresolved external symbol "public: static struct QMetaObject const staticMetaObject"

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qt6qmetaobjectmsvc2022
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  • A a_coder

    after some edit of my code i think i fixed it but i got some another errors:

    1>G:\project\project\control.h(76,7): error C2143: syntax error: missing ';' before '*'
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\control.h(76,7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\control.h(76,14): error C2238: unexpected token(s) preceding ';'
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\control.h(50,15): error C2061: syntax error: identifier 'Mainw'
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\control.h(50,27): error C2612: trailing ')' illegal in base/member initializer list
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\mainw.h(12,2): warning C4081: expected ')'; found 'string'
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\x64\Debug\moc\moc_mainw.cpp(32,1): warning C4081: expected ')'; found 'string'
    1>G:\project\project\x64\Debug\moc\moc_mainw.cpp(160,1): error C1004: unexpected end-of-file found
    1>Done building project "project.vcxproj" -- FAILED.
    1>Done building project "project.vcxproj" -- FAILED.
    

    i think workspace and mainw class isn't defined in control class although i inclued it
    my control.h

    #ifndef CONTROLER_H
    #define CONTROLER_H
    
    #include <qobject.h>
    #include <qtimer.h>
    #include <qobject.h>
    #include "mainw.h"
    #include "workspace.h"
    
    
    class Timer :public QObject {
    	Q_OBJECT
    public:
    	Timer(long long &timesetup, QObject* parent = nullptr)
    		:QObject(parent)
    		,counter(new QTimer)
    	{
    		timereaining = &timesetup;
    		connect(counter, &QTimer::timeout, this, &Timer::sendupdate);
    	}
    	void start() {
    		counter->setInterval(1000);
    		counter->start();
    	}
    signals:
    	void requestupdated(long long remainsecond);
    	void timeout();
    private slots:
    	void sendupdate() {
    		if (*timereaining <= 0) {
    			emit timeout();
    		}
    		else {
    			(*timereaining)--;
    			emit requestupdated(*timereaining);
    		}
    	}
    private:
    	long long* timereaining;
    	QTimer* counter;
    };
    
    class control :public QObject {
    	Q_OBJECT
    public:
    	control(Timer* time, QObject* parent = nullptr):
    		QObject(parent)
    		,timer(time)
    		, workspace(new Workspace(timer))
    		, mainw(new Mainw(timer))
    	{
    		/*mainw = new Mainw(timer);
    		workspace = new Workspace(timer);*/
    	}
    	~control() {
    	}
    	void start() {
    		connect(mainw, &Mainw::change_gui, this, &control::changeto_workspace_slot);
    		connect(workspace, &Workspace::change_gui, this, &control::changeto_mainw_slot);
    		mainw->start();
    	}
    //signals:
    	//void changeto_mainw();
    	//void changeto_workspace();
    private slots:
    	void changeto_mainw_slot() {
    		mainw->start();
    		workspace->close();
    	}
    	void changeto_workspace_slot() {
    		workspace->start();
    		mainw->close();
    	}
    private:
    	Timer* timer;
    	Mainw* mainw;
    	Workspace* workspace;
    };
    #endif // CONTROLER_H
    

    and i detached mainw and workspace and put it to different header file

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #12

    @a_coder said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

    1>G:\project\project\control.h(76,7): error C2143: syntax error: missing ';' before '*'
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
    1>G:\project\project\control.h(76,7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
    1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')

    So, what is in these lines in control.h?
    And what is the very first error?

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

    Christian EhrlicherC 1 Reply Last reply
    0
    • jsulmJ jsulm

      @a_coder said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

      1>G:\project\project\control.h(76,7): error C2143: syntax error: missing ';' before '*'
      1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
      1>G:\project\project\control.h(76,7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
      1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')

      So, what is in these lines in control.h?
      And what is the very first error?

      Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #13

      apart from the really strange usage of reference and pointers to this reference which will likely not work, don't use 'long long' in signals and slots (or any other 'composed' type as e.g. unsigned int)

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

      A 1 Reply Last reply
      0
      • Christian EhrlicherC Christian Ehrlicher

        apart from the really strange usage of reference and pointers to this reference which will likely not work, don't use 'long long' in signals and slots (or any other 'composed' type as e.g. unsigned int)

        A Offline
        A Offline
        a_coder
        wrote on last edited by
        #14

        @Christian-Ehrlicher which vaule i can use in signal and slots?

        Christian EhrlicherC 1 Reply Last reply
        0
        • A a_coder

          @Christian-Ehrlicher which vaule i can use in signal and slots?

          Christian EhrlicherC Offline
          Christian EhrlicherC Offline
          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on last edited by
          #15

          @a_coder said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

          which vaule i can use in signal and slots?

          How should I know which value you send through signals and slot. If you want which datatype then, as I already said, anything which consists of only one word to not confuse the moc compiler.

          Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
          Visit the Qt Academy at https://academy.qt.io/catalog

          A 1 Reply Last reply
          0
          • Christian EhrlicherC Christian Ehrlicher

            @a_coder said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

            which vaule i can use in signal and slots?

            How should I know which value you send through signals and slot. If you want which datatype then, as I already said, anything which consists of only one word to not confuse the moc compiler.

            A Offline
            A Offline
            a_coder
            wrote on last edited by a_coder
            #16

            @Christian-Ehrlicher i want to synchronized my countdown from two windows so i send the signal with the time remain in there.however, i don't think that will make the code error

            JonBJ 1 Reply Last reply
            0
            • A a_coder

              @Christian-Ehrlicher i want to synchronized my countdown from two windows so i send the signal with the time remain in there.however, i don't think that will make the code error

              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #17

              @a_coder
              @Christian-Ehrlicher has suggested you do not use a type written as e.g. long long as a signal parameter, as moc may not like it. I don't know, but I would try obeying his hint and change that to see if it helps.

              A 1 Reply Last reply
              0
              • JonBJ JonB

                @a_coder
                @Christian-Ehrlicher has suggested you do not use a type written as e.g. long long as a signal parameter, as moc may not like it. I don't know, but I would try obeying his hint and change that to see if it helps.

                A Offline
                A Offline
                a_coder
                wrote on last edited by
                #18

                @JonB now i removed long long in signal and it will get that in Timer class but i still got some errors

                Build started at 8:33 CH...
                1>------ Build started: Project: project, Configuration: Debug x64 ------
                1>Reading Qt configuration (E:/Qt/6.7.0/msvc2019_64/bin/qmake)
                1>uic mainw.ui
                1>uic workspace.ui
                1>moc control.h
                1>moc mainw.h
                1>moc workspace.h
                1>main.cpp
                1>mainw.cpp
                1>workspace.cpp
                1>moc_control.cpp
                1>moc_mainw.cpp
                1>G:\project\project\control.h(77,7): error C2143: syntax error: missing ';' before '*'
                1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                1>G:\project\project\control.h(77,7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
                1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                1>G:\project\project\control.h(77,14): error C2238: unexpected token(s) preceding ';'
                1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                1>G:\project\project\control.h(51,15): error C2061: syntax error: identifier 'Mainw'
                1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                1>G:\project\project\control.h(51,27): error C2612: trailing ')' illegal in base/member initializer list
                1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                1>G:\project\project\mainw.h(12,2): warning C4081: expected ')'; found 'string'
                1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                1>G:\project\project\x64\Debug\moc\moc_mainw.cpp(32,1): warning C4081: expected ')'; found 'string'
                1>G:\project\project\x64\Debug\moc\moc_mainw.cpp(159,1): error C1004: unexpected end-of-file found
                1>Done building project "project.vcxproj" -- FAILED.
                ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
                ========== Build completed at 8:33 CH and took 11,009 seconds ==========
                
                jsulmJ 1 Reply Last reply
                0
                • A a_coder

                  @JonB now i removed long long in signal and it will get that in Timer class but i still got some errors

                  Build started at 8:33 CH...
                  1>------ Build started: Project: project, Configuration: Debug x64 ------
                  1>Reading Qt configuration (E:/Qt/6.7.0/msvc2019_64/bin/qmake)
                  1>uic mainw.ui
                  1>uic workspace.ui
                  1>moc control.h
                  1>moc mainw.h
                  1>moc workspace.h
                  1>main.cpp
                  1>mainw.cpp
                  1>workspace.cpp
                  1>moc_control.cpp
                  1>moc_mainw.cpp
                  1>G:\project\project\control.h(77,7): error C2143: syntax error: missing ';' before '*'
                  1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                  1>G:\project\project\control.h(77,7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
                  1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                  1>G:\project\project\control.h(77,14): error C2238: unexpected token(s) preceding ';'
                  1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                  1>G:\project\project\control.h(51,15): error C2061: syntax error: identifier 'Mainw'
                  1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                  1>G:\project\project\control.h(51,27): error C2612: trailing ')' illegal in base/member initializer list
                  1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                  1>G:\project\project\mainw.h(12,2): warning C4081: expected ')'; found 'string'
                  1>(compiling source file 'x64/Debug/moc/moc_mainw.cpp')
                  1>G:\project\project\x64\Debug\moc\moc_mainw.cpp(32,1): warning C4081: expected ')'; found 'string'
                  1>G:\project\project\x64\Debug\moc\moc_mainw.cpp(159,1): error C1004: unexpected end-of-file found
                  1>Done building project "project.vcxproj" -- FAILED.
                  ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
                  ========== Build completed at 8:33 CH and took 11,009 seconds ==========
                  
                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #19

                  @a_coder Please post current control.h and also mark the line 77 there

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

                  1 Reply Last reply
                  1
                  • A Offline
                    A Offline
                    a_coder
                    wrote on last edited by
                    #20

                    @jsulm

                    #ifndef CONTROLER_H
                    #define CONTROLER_H
                    
                    #include <qobject.h>
                    #include <qtimer.h>
                    #include <qobject.h>
                    #include "mainw.h"
                    #include "workspace.h"
                    
                    
                    class Timer :public QObject {
                    	Q_OBJECT
                    public:
                    	Timer(long long &timesetup, QObject* parent = nullptr)
                    		:QObject(parent)
                    		,counter(new QTimer)
                    	{
                    		timereaining = &timesetup;
                    		connect(counter, &QTimer::timeout, this, &Timer::sendupdate);
                    	}
                    	long long timeleft() { return *timereaining; }
                    	void start() {
                    		counter->setInterval(1000);
                    		counter->start();
                    	}
                    signals:
                    	void requestupdated();
                    	void timeout();
                    private slots:
                    	void sendupdate() {
                    		if (*timereaining <= 0) {
                    			emit timeout();
                    		}
                    		else {
                    			(*timereaining)--;
                    			emit requestupdated();
                    		}
                    	}
                    private:
                    	long long* timereaining;
                    	QTimer* counter;
                    };
                    
                    class control :public QObject {
                    	Q_OBJECT
                    public:
                    	control(Timer* time, QObject* parent = nullptr):
                    		QObject(parent)
                    		,timer(time)
                    		, workspace(new Workspace(timer))
                    		, mainw(new Mainw(timer))
                    	{
                    		/*mainw = new Mainw(timer);
                    		workspace = new Workspace(timer);*/
                    	}
                    	~control() {
                    	}
                    	void start() {
                    		connect(mainw, &Mainw::change_gui, this, &control::changeto_workspace_slot);
                    		connect(workspace, &Workspace::change_gui, this, &control::changeto_mainw_slot);
                    		mainw->start();
                    	}
                    //signals:
                    	//void changeto_mainw();
                    	//void changeto_workspace();
                    private slots:
                    	void changeto_mainw_slot() {
                    		mainw->start();
                    		workspace->close();
                    	}
                    	void changeto_workspace_slot() {
                    		workspace->start();
                    		mainw->close();
                    	}
                    private:
                    	Timer* timer;
                    	Mainw* mainw; //line 77
                    	Workspace* workspace;
                    };
                    #endif // CONTROLER_H 
                    

                    sorry idk how to mark that

                    jsulmJ 2 Replies Last reply
                    0
                    • A a_coder

                      @jsulm

                      #ifndef CONTROLER_H
                      #define CONTROLER_H
                      
                      #include <qobject.h>
                      #include <qtimer.h>
                      #include <qobject.h>
                      #include "mainw.h"
                      #include "workspace.h"
                      
                      
                      class Timer :public QObject {
                      	Q_OBJECT
                      public:
                      	Timer(long long &timesetup, QObject* parent = nullptr)
                      		:QObject(parent)
                      		,counter(new QTimer)
                      	{
                      		timereaining = &timesetup;
                      		connect(counter, &QTimer::timeout, this, &Timer::sendupdate);
                      	}
                      	long long timeleft() { return *timereaining; }
                      	void start() {
                      		counter->setInterval(1000);
                      		counter->start();
                      	}
                      signals:
                      	void requestupdated();
                      	void timeout();
                      private slots:
                      	void sendupdate() {
                      		if (*timereaining <= 0) {
                      			emit timeout();
                      		}
                      		else {
                      			(*timereaining)--;
                      			emit requestupdated();
                      		}
                      	}
                      private:
                      	long long* timereaining;
                      	QTimer* counter;
                      };
                      
                      class control :public QObject {
                      	Q_OBJECT
                      public:
                      	control(Timer* time, QObject* parent = nullptr):
                      		QObject(parent)
                      		,timer(time)
                      		, workspace(new Workspace(timer))
                      		, mainw(new Mainw(timer))
                      	{
                      		/*mainw = new Mainw(timer);
                      		workspace = new Workspace(timer);*/
                      	}
                      	~control() {
                      	}
                      	void start() {
                      		connect(mainw, &Mainw::change_gui, this, &control::changeto_workspace_slot);
                      		connect(workspace, &Workspace::change_gui, this, &control::changeto_mainw_slot);
                      		mainw->start();
                      	}
                      //signals:
                      	//void changeto_mainw();
                      	//void changeto_workspace();
                      private slots:
                      	void changeto_mainw_slot() {
                      		mainw->start();
                      		workspace->close();
                      	}
                      	void changeto_workspace_slot() {
                      		workspace->start();
                      		mainw->close();
                      	}
                      private:
                      	Timer* timer;
                      	Mainw* mainw; //line 77
                      	Workspace* workspace;
                      };
                      #endif // CONTROLER_H 
                      

                      sorry idk how to mark that

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #21

                      @a_coder Please also post mainw.h

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

                      1 Reply Last reply
                      1
                      • A a_coder

                        @jsulm

                        #ifndef CONTROLER_H
                        #define CONTROLER_H
                        
                        #include <qobject.h>
                        #include <qtimer.h>
                        #include <qobject.h>
                        #include "mainw.h"
                        #include "workspace.h"
                        
                        
                        class Timer :public QObject {
                        	Q_OBJECT
                        public:
                        	Timer(long long &timesetup, QObject* parent = nullptr)
                        		:QObject(parent)
                        		,counter(new QTimer)
                        	{
                        		timereaining = &timesetup;
                        		connect(counter, &QTimer::timeout, this, &Timer::sendupdate);
                        	}
                        	long long timeleft() { return *timereaining; }
                        	void start() {
                        		counter->setInterval(1000);
                        		counter->start();
                        	}
                        signals:
                        	void requestupdated();
                        	void timeout();
                        private slots:
                        	void sendupdate() {
                        		if (*timereaining <= 0) {
                        			emit timeout();
                        		}
                        		else {
                        			(*timereaining)--;
                        			emit requestupdated();
                        		}
                        	}
                        private:
                        	long long* timereaining;
                        	QTimer* counter;
                        };
                        
                        class control :public QObject {
                        	Q_OBJECT
                        public:
                        	control(Timer* time, QObject* parent = nullptr):
                        		QObject(parent)
                        		,timer(time)
                        		, workspace(new Workspace(timer))
                        		, mainw(new Mainw(timer))
                        	{
                        		/*mainw = new Mainw(timer);
                        		workspace = new Workspace(timer);*/
                        	}
                        	~control() {
                        	}
                        	void start() {
                        		connect(mainw, &Mainw::change_gui, this, &control::changeto_workspace_slot);
                        		connect(workspace, &Workspace::change_gui, this, &control::changeto_mainw_slot);
                        		mainw->start();
                        	}
                        //signals:
                        	//void changeto_mainw();
                        	//void changeto_workspace();
                        private slots:
                        	void changeto_mainw_slot() {
                        		mainw->start();
                        		workspace->close();
                        	}
                        	void changeto_workspace_slot() {
                        		workspace->start();
                        		mainw->close();
                        	}
                        private:
                        	Timer* timer;
                        	Mainw* mainw; //line 77
                        	Workspace* workspace;
                        };
                        #endif // CONTROLER_H 
                        

                        sorry idk how to mark that

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #22

                        @a_coder Btw. it is not a good idea to have more than one QObject based class in one header file - this can cause problems with moc tool.

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

                        A JonBJ 2 Replies Last reply
                        0
                        • jsulmJ jsulm

                          @a_coder Btw. it is not a good idea to have more than one QObject based class in one header file - this can cause problems with moc tool.

                          A Offline
                          A Offline
                          a_coder
                          wrote on last edited by
                          #23

                          @jsulm i detached it before and these are my files
                          mainw.h

                          #ifndef MAINW_H
                          #define MAINW_H
                          
                          #include <qmainwindow.h>
                          #include "ui_mainw.h"
                          #include "control.h"
                          
                          class Timer;
                          class control;
                          
                          class Mainw : public QMainWindow {
                          	Q_OBJECT
                          public:
                          	void start();
                          	Mainw(Timer* time, QWidget* parent = nullptr);
                          	~Mainw();
                          signals:
                          	void change_gui();
                          private:
                          	Ui::Main* ui;
                          	Timer* timer;
                          private slots:
                          	void updatetime();
                          	void toworkspace() {
                          		ui->pushButton->setDisabled(true);
                          		emit change_gui();
                          		this->close();
                          	}
                          };
                          #endif // !MAINW_H
                          

                          workspace.h

                          #ifndef WORKSPACE_H
                          #define WORKSPACE_H
                          
                          #include <qprocess.h>
                          #include <qmainwindow.h>
                          #include "ui_workspace.h"
                          #include "control.h"
                          
                          class Timer;
                          
                          class Workspace : public QWidget {
                          	Q_OBJECT
                          public:
                          	Workspace(Timer* time, QWidget* parent = nullptr);
                          	~Workspace();
                          	void start();
                          signals:
                          	void change_gui();
                          private:
                          	//store all processes the ui run in a vector
                          	std::vector<QProcess*> processes;
                          	Ui::workspace* ui;
                          	Timer* timer;
                          private slots:
                          	void updatetime();
                          	void goback();
                          };
                          
                          #endif // WORKSPACE_H
                          
                          jsulmJ 1 Reply Last reply
                          0
                          • jsulmJ jsulm

                            @a_coder Btw. it is not a good idea to have more than one QObject based class in one header file - this can cause problems with moc tool.

                            JonBJ Offline
                            JonBJ Offline
                            JonB
                            wrote on last edited by JonB
                            #24

                            @jsulm said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

                            more than one QObject based class in one header file

                            I don't want to derail this thread, but spoke to @Chris-Kawa a while ago and we both agree we have done this for years with no problems. Maybe we just don't do something "unusual/naughty/complicated".

                            1 Reply Last reply
                            0
                            • A a_coder

                              @jsulm i detached it before and these are my files
                              mainw.h

                              #ifndef MAINW_H
                              #define MAINW_H
                              
                              #include <qmainwindow.h>
                              #include "ui_mainw.h"
                              #include "control.h"
                              
                              class Timer;
                              class control;
                              
                              class Mainw : public QMainWindow {
                              	Q_OBJECT
                              public:
                              	void start();
                              	Mainw(Timer* time, QWidget* parent = nullptr);
                              	~Mainw();
                              signals:
                              	void change_gui();
                              private:
                              	Ui::Main* ui;
                              	Timer* timer;
                              private slots:
                              	void updatetime();
                              	void toworkspace() {
                              		ui->pushButton->setDisabled(true);
                              		emit change_gui();
                              		this->close();
                              	}
                              };
                              #endif // !MAINW_H
                              

                              workspace.h

                              #ifndef WORKSPACE_H
                              #define WORKSPACE_H
                              
                              #include <qprocess.h>
                              #include <qmainwindow.h>
                              #include "ui_workspace.h"
                              #include "control.h"
                              
                              class Timer;
                              
                              class Workspace : public QWidget {
                              	Q_OBJECT
                              public:
                              	Workspace(Timer* time, QWidget* parent = nullptr);
                              	~Workspace();
                              	void start();
                              signals:
                              	void change_gui();
                              private:
                              	//store all processes the ui run in a vector
                              	std::vector<QProcess*> processes;
                              	Ui::workspace* ui;
                              	Timer* timer;
                              private slots:
                              	void updatetime();
                              	void goback();
                              };
                              
                              #endif // WORKSPACE_H
                              
                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by jsulm
                              #25

                              @a_coder said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

                              #include "control.h"

                              class Timer;
                              class control;

                              You have a circular dependency: mainw.h includes control.h and control.h includes mainw.h. This is not going to work. Since you only use Timer* in mainw.h and already have a forward declaration for it, the control.h include is not needed, remove it.

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

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                              0
                              • jsulmJ jsulm

                                @a_coder said in unresolved external symbol "public: static struct QMetaObject const staticMetaObject":

                                #include "control.h"

                                class Timer;
                                class control;

                                You have a circular dependency: mainw.h includes control.h and control.h includes mainw.h. This is not going to work. Since you only use Timer* in mainw.h and already have a forward declaration for it, the control.h include is not needed, remove it.

                                A Offline
                                A Offline
                                a_coder
                                wrote on last edited by
                                #26

                                @jsulm it worked, thanks

                                1 Reply Last reply
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