Installing QwtPolar: very special problem linking examples

[BestBeforeNow]

I use Qt 4.6.2 and Qwt 6.0.0 rc5, so the version 0.1.0 of QwtPolar did not compile.
Following the Thread "QwtPolar with latest QWT" I got the trunk from QwtPolar via SVN, fixed some include problems compiling the library qwtpolar, and finally got the library.

When I try to link the examples, I get the error

moc_plot.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QwtPolarPlot::staticMetaObject" (?staticMetaObject@QwtPolarPlot@@2UQMetaObject@@B)

despite the fact, that the build log tells me, that the correct library is used.

My own application links well (as I use dynamic library), but fails, when it comes to

void setupUi(QMainWindow *ESM_GUI)
    {
        ...
        qwtPolarPlot = new QwtPolarPlot(tabPolar);
        ...
    }

void setupUi(QMainWindow *ESM_GUI)
    {
        ...
        qwtPolarPlot = new QwtPolarPlot(tabPolar);
        ...
    }

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In all of the libraries (static and dynamic) I can verify, that the missing function is contained.
I use MS Visual Studio 2008 for development.

Are there any suggestions to solve this problem?

[Uwe]

This is a common problem with building Qt applications, when the makefile is not aware of running moc for a file.

Uwe

[BestBeforeNow]

Thank you for answering, but this idea had most of my colleagues already. As I tried to explain: moc compiler ran, the moc-object was created, the library was created without any error and (for the DLL with depends.exe, for the libs with an editor) I can see, that quite that export is contained, that the linker is missing (please see my first post).

A colleague of mine also tried the same with Qt 4.7.3, Qwt6 and the QwtPolar trunk and stuck at the same problem. Can there be anything wrong with the configuration files? The only thing I changed was introducing the path to my installation directory. And I copied the feature files to the Qt mkspec/features directory.

[Uwe]

Did you set QWT_POLAR_DLL, when compiling your code ?

Uwe

[vinaykusta]

Hi,

I'm a absolute beginner.

As per instruction, I have installed Qt 4.7.1, Qwt 6.0.1 and QwtPolar 1.0.0

I got the same error as mentioned in the first thread while building the Qwt Polar examples.

I'm using QT-creator. I copied all header and source files of qwtpolar-1.0.0\examples\polardemo to a new project. I have following contents in project file:

QT += core
QT += gui

TARGET = PolarExample
CONFIG += console
CONFIG -= app_bundle
CONFIG += release

CONFIG += qwt
CONFIG += qwtpolar

TEMPLATE = app

INCLUDEPATH += C:\QwtPolar-1.0.0\include \
C:\Qwt-6.0.1\include

LIBS += C:\QwtPolar-1.0.0\lib\qwtpolar.lib \
C:\Qwt-6.0.1\lib\qwt.lib

SOURCES += main.cpp \
mainwindow.cpp \
plot.cpp \
settingseditor.cpp

HEADERS += mainwindow.h \
pixmaps.h \
plot.h \
settingseditor.h

I was not able to correctly figure out the solution for error by going through the discussion. I understand that setting QWT_POLAR_DLL while compiling the code should solve the probblem.

As I'm a complete beginner, please guide how or where to set QWT_POLAR_DLL ??

Thank you.

[Spitfire]

Add

win32: DEFINES += QWT_POLAR_DLL

win32: DEFINES += QWT_POLAR_DLL

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to your .pro file.

[Uwe]

Better do a clean installation of Qwt and QwtPolar using "make install". Then configure your qmake environment like documented in the INSTALL files and add

CONFIG += qwt
CONFIG += qwtpolar

CONFIG += qwt
CONFIG += qwtpolar

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to your pro file.

Uwe