Sam
Area 51 Engineer
609 posts

### [SOLVED] QWT 6.0 library in QT

Hi,
I have downloaded QWT 6.0 from svn co https://qwt.svn.sourceforge.net/svnroot/qwt/branches/qwt-6.0 [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

1. INCLUDEPATH += D:\Qwt\include
2. DEPENDPATH += D:\Qwt\lib
3.
4. LIBS += -LD:\Qwt\lib
5.
6. win32 {
7.  CONFIG(debug, debug|release) {
8.                 LIBS += -lqwtd
9.  } else {
10.                 LIBS += -lqwt
11.  }
12. }

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.

8 replies

#### May 9, 2012

Andre
Area 51 Engineer
6031 posts

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?

Signature

#### May 9, 2012

Sam
Area 51 Engineer
609 posts

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

1. include( $${PWD}/../examples.pri ) Which is specified in all the .pro file in the example folder of QWT. It work and display the mainwindow with the charts. But if i create a folder in any other directory and then write 1. LOCATION = C:\qwt-6.0\examples 2. 3. include($${LOCATION}/examples.pri )

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

#### May 9, 2012

koahnig
2099 posts

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.

#### May 9, 2012

Sam
Area 51 Engineer
609 posts

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

1. /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2.  * Qwt Widget Library
3.  * Copyright (C) 1997   Josef Wilgen
4.  * Copyright (C) 2002   Uwe Rathmann
5.  *
6.  * This library is free software; you can redistribute it and/or
7.  * modify it under the terms of the Qwt License, Version 1.0
8.  *****************************************************************************/
9.
10. // vim: expandtab
11.
12. #ifndef QWT_ARRAY_H
13. #define QWT_ARRAY_H
14.
15. #include "qwt_global.h"
16.
17. /*!
18.   \def QwtArray
19.   Aliases QArray (Qt-2.x) and QMemArray (Qt-3.x) to QwtArray
20.  */
21. #ifdef QWT_NO_MEMARRAY
22. #include <qarray.h>
23. #define QwtArray QArray
24. #else
25. #include <qmemarray.h>    <---Here this file is included.
26. #define QwtArray QMemArray
27. #endif
28. #endif

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

#### May 9, 2012

koahnig
2099 posts

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

#### May 9, 2012

Sam
Area 51 Engineer
609 posts

Hi koahnig,
Sorry I was linking to the old library which i downloaded from qwt [sourceforge.net]. I switched the path to the current source library

1. INCLUDEPATH += C:\qwt-6.0\src
2. DEPENDPATH += C:\qwt-6.0\lib
3.
4. LIBS += -LC:\qwt-6.0\lib

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

1. LOCATION = C:\qwt-6.0\examples
2.
3. 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 ?

#### May 9, 2012

koahnig
2099 posts

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.

#### May 9, 2012

Sam
Area 51 Engineer
609 posts

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.