Nothing works !

[Amoliane]

Hello !

I am using Qt 5.0.2 on ubuntu (12) and I wanted to use qwt on it but it definitely does not work. Do I have to uninstall everything and start again from scratch ?

Qt is installed in /opt/Qt5.0.2 ; I have installed it manually.
I have installed qwt 6.1.0 (which is in /usr/local/ as default) but I can't even use the library. When I try to, the files compiles but "The program has unexpectedly finished."
So maybe I have a wrong installation of the library.

As well, when I start QtCreator, I have this warning : " Warning: Kit file version 0 not supported, cannot restore kits!" which makes me wonder if I have changed something I shouldn't have while trying to add qwt...

Can somebody help me please ?

Camille.

[wysota]

When I try to, the files compiles but "The program has unexpectedly finished."
So maybe I have a wrong installation of the library.

No, you have bugs in your code.

[Amoliane]

No, you have bugs in your code.

I have only with qwt... When I only do that :

#include <QApplication>
#include <qwt/qwt_compass.h>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    QwtCompass compass;
    compass.show();
 
    return a.exec();
}

#include <QApplication>
#include <qwt/qwt_compass.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QwtCompass compass;
    compass.show();
    
    return a.exec();
}

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I have the same result. I have no problem with all my C++ ; it is only qwt which I cannot use. Can you understand why ?

And I would really like to have this library include in the designer ; I don't why the plugin fails.

[Amoliane]

Is there really anybody who can help me ? I need qwt... :'(

[wysota]

What does your .pro file look like?

[Amoliane]

QT       += core gui
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = test
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h
 
FORMS    += mainwindow.ui
 
#qwt
CONFIG += qwt
 
unix|win32: LIBS += -L$$PWD/../../../../../usr/local/qwt-6.1.0/lib/ -lqwt
 
INCLUDEPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include
DEPENDPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

#qwt
CONFIG += qwt

unix|win32: LIBS += -L$$PWD/../../../../../usr/local/qwt-6.1.0/lib/ -lqwt

INCLUDEPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include
DEPENDPATH += $$PWD/../../../../../usr/local/qwt-6.1.0/include

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mainwindow is nothing, it is only because I have created with QtCreator quickly and it has generated this class which I don't use.
Actually I want qwt for another project and this one is only to understand why it doesn't work.

Do you see something wrong ? If not, do you think the library could be badly installed and justified the error ?

[wysota]

The last four lines shouldn't be there. If you need them then apparently line #17 of your .pro file doesn't work which probably means you haven't read the readme file that comes with Qwt.

[Amoliane]

I have read many thing and still don't understand what I should do since there seems to be several ways to install qwt and I still don't know what should be manual and what should not be.

I have the same result when I remove those lines.

[wysota]

Don't read many things you don't need. Read the one thing you do need. Each Qwt source bundle comes with installation instructions. Just follow them.

[Amoliane]

It was the first thing I read and then I had trouble ! Well, I start again.

I confirm : I had read the README which told me to read the INSTALL which told me to read doc/html/qwtinstall.html which is the same thing as on the web which I have done... Trust me, this is the first time I ask a question ; usually I do everything by my own without problem. I may have made a mistake here ; that is pretty sure ! But I don't know what it is and I think there is something on that very page (qwtinstall.html) that I have not understood.

If you have explanation in french, it may be easier but I don't think the language is the problem here.

Thank you if you can help me.

[wysota]

So what exactly did you do after you read qwtinstall.html?

In particular did you follow the "Build and installation" section?

Did you follow the "Building a Qwt application" section?

Did you follow the "Running a Qwt application" section?

[Uwe]

Let me confirm Witold comments: it is not about criticizing - it is simply, that it is almost impossible to give reasonable support for a messed up configuration we don't know.

So try to revert everything you did so far with your Qwt installation and start from scratch doing it step by step. As soon as you have a problem don't try to help yourself without understanding what you are doing - ask here instead.

The installation guide is far from being perfect and I'm afraid it doesn't meet the requirements for all levels of experiences. But when you feel unsure better ask before following any of these cookbooks you find in the web - many of them are wrong most of them for different versions of Qwt.

Uwe