Error when qsing qwt in qt application

[marc2050]

Hi.

I had programmed a qt application. Everything runs fine.
I like to add in some plotting function and found this wonderful qwt.
So, I am now trying to integrate qwt into my qt application.
But I got the following error.

moc_myplotmap.obj:-1: error: LNK2001: unresolved external symbol "public: static struct QMetaObject const QwtPlot::staticMetaObject" (?staticMetaObject@QwtPlot@@2UQMetaObject@@B)

In my .pro file, I've already done the
QWT_ROOT = "c:\mydirectory\qwt-6.0"
LIBS += -lmyspeciallibrary -lqwt -lqwtmathml
LIBPATH += $${QWT_ROOT}/lib
INCLUDEPATH += $${QWT_ROOT}/src
qtAddLibrary(qwt)

So, I dont know what else I am missing. Any help please?
Thank you!!

[Uwe]

Use the features file of Qwt - read the instructions in INSTALL how to do it.

Uwe

[marc2050]

Thanks.
I read the INSTALL file and added the CONFIG += qwt.
My error is still the same.
Below is my .pro file.
I really have no clue how to solve it. Any more help please.

QT       += core gui
QWT_ROOT = "c:/mydirectory/qwt-6.0"
 
TARGET = myprogram
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp \
    andmorewhateverfilesIneed.cpp
 
HEADERS  += mainwindow.h \
    andmorewhateverfilesIneed.h
 
 
DEFINES    += QWT_DL
CONFIG += qwt
QMAKE_LIBDIR += 	$${QWT_ROOT}/lib
INCLUDEPATH += 	$${QWT_ROOT}/src
LIBS += -lqwt
qtAddLibrary(qwt)
FORMS    += mainwindow.ui

QT       += core gui
QWT_ROOT = "c:/mydirectory/qwt-6.0"

TARGET = myprogram
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp \
    andmorewhateverfilesIneed.cpp

HEADERS  += mainwindow.h \
    andmorewhateverfilesIneed.h


DEFINES    += QWT_DL
CONFIG += qwt
QMAKE_LIBDIR += 	$${QWT_ROOT}/lib
INCLUDEPATH += 	$${QWT_ROOT}/src
LIBS += -lqwt
qtAddLibrary(qwt)
FORMS    += mainwindow.ui

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[Uwe]

Remove all lines you have added ( beside CONFIG += qwt ).

Uwe

PS: it's QWT_DLL not QWT_DL, but this define should be set by the qwt features file if you have configured qmake successfully

[marc2050]

I did what exactly what is said. removed the lines etc.
Problem persists.
Is there someone who can give the exact meaning to the error of
unresolved external symbol "public: static struct QMetaObject const QwtPlot::staticMetaObject"

It seems to me that my codes

#include <qwt_plot.h>
#include <qwt_plot_spectrogram.h>
 
class myMap: public QwtPlot
{
    Q_OBJECT
 
public:
    myMap(QWidget * = NULL);
 
public Q_SLOTS:
//    void showContour(bool on);
//    void showSpectrogram(bool on);
 
private:
    QwtPlotSpectrogram *d_spectrogram;
};

#include <qwt_plot.h>
#include <qwt_plot_spectrogram.h>

class myMap: public QwtPlot
{
    Q_OBJECT

public:
    myMap(QWidget * = NULL);

public Q_SLOTS:
//    void showContour(bool on);
//    void showSpectrogram(bool on);

private:
    QwtPlotSpectrogram *d_spectrogram;
};

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the part "public QwtPlot" is the source of error?