creating cpp library using qt

[jsulm]

@amruz Will probably not solve that error, but this looks wrong as well:

QT -= gui

Your app is going to show an UI, right? Then it is a gui app:

QT += core gui widgets

Don't forget to rerun qmake after changing pro file and rebuild.

[amruz]

@jsulm said in creating cpp library using qt:

QT += core gui widgets

this is a console application actually..is that the problem?

[jsulm]

@amruz If it is a console application then why do you want to use a library which provides an UI class:

class WORKSHAREDLIBSHARED_EXPORT Worksharedlib:public QWidget
{

   Q_OBJECT
public:
    //Worksharedlib();
    Worksharedlib(QWidget *parent = 0);
    ~Worksharedlib() {}

private slots:
   void handleButton();
   void m_buttonClicked();

private:
   QPushButton *m_button;
   QLineEdit *m_textbox;
   QHBoxLayout *layout;
   QWidget *window;
   QLabel * label;
   QWidget *frame;
};

?

[amruz]

@jsulm which application should i use to test this library?

[jsulm]

@amruz gui?

[amruz]

@jsulm do you mean qt widget application?

[jsulm]

@amruz Yes. You're using widgets - so it must be a gui application with widgets, right?

QT += core gui widgets

[amruz]

@jsulm when i try to include this library in a widget application also i am getting the same error..

this is the .pro file of my widgetapplication

#-------------------------------------------------
#
# Project created by QtCreator 2017-07-27T17:19:21
#
#-------------------------------------------------

QT       += core gui widgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = sharedlibtryinwidget
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

DEPENDPATH += /home/amruz/worksharedlib
INCLUDEPATH += /home/amruz/worksharedlib
LIBS += -L/home/amruz/build-worksharedlib-Desktop_Qt_5_7_0_GCC_64bit-Debug -lworksharedlib

[amruz]

@amruz i also found that when destructor is not included this type of error may occur..but when i added destructor also the same problem exists

[amruz]

@jsulm it worked finally! thanks a lot for all the help

the problem was qobject in the library , i removed it and it worked.