# [SOLVED] QWT 6.0 library in QT

• Hi,
":http://qwt.sourceforge.net/ . I am able to run the sample example that are provide within the same folder.
But I need to use the same library for my projects. So i created a new project and copied the program tvplot from the qwt examples.

I then added the following code in my .pro file

@INCLUDEPATH += D:\Qwt\include
DEPENDPATH += D:\Qwt\lib

LIBS += -LD:\Qwt\lib

win32 {
CONFIG(debug, debug|release) {
LIBS += -lqwtd
} else {
LIBS += -lqwt
}
}@

But when i compile and run it gives error "cannot open include file qmemarray.h" . I have searched on the net for the header files as well as how to setup qwt libraries. But didnt get this working on windows 7.

• QMemArray is a Qt3 relic. QVector would be the closest Qt4 equivalent. I have no idea why QWT tries to use it still... However, a quick search on "QMemArray Qwt" gives quite a number of hits. Perhaps your answer is among them?

• Hi,
Thanks for the reply Andre. I searched for "QMemArray Qwt" and have gone through all the links and solution in the first page. However I tried a different approach. I created a new Project in the same path where i have copied qwt e.g c:\qwt-6.0\examples. And then in the .pro file of my project i included

@include( $${PWD}/../examples.pri )@ Which is specified in all the .pro file in the example folder of QWT. It work and display the mainwindow with the charts. But if i create a folder in any other directory and then write @LOCATION = C:\qwt-6.0\examples include($${LOCATION}/examples.pri )@

It includes the files but shows the same error cannot include qmemarray.h

• Soumitra, did you find a reference to qmemarray.h in the source for QWT? I have QWT 6.0.1 source and I could not find a reference to this header file within the whole source tree.
Possibly the problem is triggered by something else.

• Hi Koahnig,

I couldnt find any reference to qmemarray.h . I searched for the file in the source folder but couldnt find one . When i click on the compiler error it opens qwt_array.h

@/* -- mode: C++ ; c-file-style: "stroustrup" -- *****************************

• Qwt Widget Library
• Copyright (C) 1997 Josef Wilgen
• Copyright (C) 2002 Uwe Rathmann
• This library is free software; you can redistribute it and/or
• modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/

// vim: expandtab

#ifndef QWT_ARRAY_H
#define QWT_ARRAY_H

#include "qwt_global.h"

/*!
\def QwtArray
Aliases QArray (Qt-2.x) and QMemArray (Qt-3.x) to QwtArray
*/
#ifdef QWT_NO_MEMARRAY
#include <qarray.h>
#define QwtArray QArray
#else
#include <qmemarray.h> <---Here this file is included.
#define QwtArray QMemArray
#endif
#endif@

And even if i add qmemarray.h (source code from google search) Then the error changes to some other header file missing.

• In which folder do you have qwt_array.h ?
I do not find this in my source tree?

• Hi koahnig,
Sorry I was linking to the old library which i downloaded from "qwt":http://sourceforge.net/projects/qwt/. I switched the path to the current source library

@INCLUDEPATH += C:\qwt-6.0\src
DEPENDPATH += C:\qwt-6.0\lib

LIBS += -LC:\qwt-6.0\lib@

This works now for my project created in some other path. But I have written

@LOCATION = C:\qwt-6.0\examples

include( {LOCATION}/examples.pri )@

in my .pro which refers to the .pri file in qwt-6.0 source folder. This is working. Is this the right approach ?

• If it compiles and you see no other issues, I would assume that it is correct. I am using QWT with MSVC and the include path is simply directed to src folder.
I am rarely using .pro and .pri files under windows.

• Thanks for the help. As of now this is working but if there is any problem i'll come back again :)
I also need to implement the QwtPlot3D library too. I'll discuss that in other thread.