realtime_plot example problem--help needed.

[swamyonline]

hi ppl,
iam trying to copy the realtime_plot example project into my own folder and trying to execute it.

iam doing it in windows with QDevelop.

1. I copied all the .cpp and .h files into my own folder.
2. Created a new project and added those realtime_plot files to it.
3. Set the env variables INCLUDEPATH += c:\qwt-5.1.1\include
LIBS += c:\qwt-5.1.1\lib\libqwt5.a
4. Set project settings to release and warn on.

with those settings, i was able to compile it successfully. But when i tried to execute it, its giving error message "The application failed to intialize properly(0xc0000005). Click on OK to terminate the application".

the project settings file:


TEMPLATE = app
SOURCES += realtime.cpp \
mainwindow.cpp \
randomplot.cpp \
incrementalplot.cpp \
scrollbar.cpp \
scrollzoomer.cpp
CONFIG += release warn_on
HEADERS += mainwindow.h \
randomplot.h \
incrementalplot.h \
realtime.h \
scrollbar.h \
scrollzoomer.h
INCLUDEPATH += c:\qwt-5.1.1\include
LIBS += c:\qwt-5.1.1\lib\libqwt5.a


what could be the real mistake i hv done? im trying execute the same example program without any code modification, except with a new .pro file other than the example .pro file.

Can any body point it out and tell me the problem...thanks in advance.

[swamyonline]

hi ppl,
it may be a silly problem, but im unable to crack it. pls point it out.

1. main.cpp


#include <QApplication>
#include "mainwindow.h"
int main(int argc,char **argv)
{
QApplication app(argc,argv);
MainWindow win;
win.show();
return app.exec();
}

2. mainwindow.h


#ifndef __MAINWINDOW_H__
#define __MAINWINDOW_H__
#include <QMainWindow>

class MainWindow: public QMainWindow
{
public:
MainWindow();
};

#endif // __MAINWINDOW_H__

3. mainwindow.cpp


#include "mainwindow.h"
MainWindow::MainWindow()
{
qDebug("Test");
}

4. randomplot.h


#ifndef __RANDOMPLOT_H__
#define __RANDOMPLOT_H__
#include<qwt_plot.h>
class MyPlot: public QwtPlot
{
Q_OBJECT
MyPlot();
};
#endif // __RANDOMPLOT_H__

5. randomplot.cpp


#include "randomplot.h"
MyPlot::MyPlot()
{
qDebug("Indent");
}

6. plot.pro


TEMPLATE = app
SOURCES += main.cpp mainwindow.cpp randomplot.cpp
HEADERS += mainwindow.h randomplot.h
CONFIG += release warn_on qt console
QT += core gui
INCLUDEPATH += c:\qwt-5.1.1\src
LIBS += c:\qwt-5.1.1\lib\libqwt5.a


I successfully, compiled the application on QDevelop on Windows XP. But when i tried to execute it, its giving the following error:
The application failed to initialize properly (0x0000005). Click on OK to terminate the application.

whats the problem?
When i removed the Q_OBJECT macro, its executing properly, no error was coming. whats that silly misake, pls suggest... thanks in advance.....bye

[jacek]

How did you compile Qwt?

P.S. Please don't start more than one thread on the same problem. Also, please, use [code] tags.

[swamyonline]

thanks jacek for replying.
ya, sure, i will follow code tags from here onwards. and the msg got posted twice accidentally.
i compiled the program within QDevelop with mingw32-make. the commands i followed within propmpt:

qmake
mingw32-make.

what i noticed is, the example programs given with Qwt are including *.pri files in compilation and iam avoiding them as iam writing a complete new .pro file with proper INCLUDEPATH and LIBS arguments. and also, the example programs r creating a ".rc " file which is not created with this simple application.
and also i noticed in the example Makefile.Release is , its compiling the resource file with this command


obj\realtime_resource_res.o: realtime_resource.rc
windres -i realtime_resource.rc -o obj\realtime_resource_res.o --include-dir=.

is there anything to do with the resource file. i hv not included the resource file within my sample program...

pls find it out and suggest me a solution..thank u again.

[jacek]

i compiled the program within QDevelop with mingw32-make. the commands i followed within propmpt
Did you compile Qwt the same way?

What happens if you change your LIBS variable to:

LIBS += -Lc:\qwt-5.1.1\lib\ -lqwt5?

[swamyonline]

jacek,
sorry, i was out of station. yes, i tried by changing the library options as u mentioned, but there is no change in the problem. still the problem persists.. but, i was successful on Linux. its executing properly. may be some resources options r missing in compiling it on windows. any way thanks for replies and pls let me know if u find solution for the problem..thank u.. bye

[jacek]

its executing properly. may be some resources options r missing in compiling it on windows.
No, it's some problem with DLLs. Have you tried copying qwt5.dll to the directory where the executable is? How do you start the application?

[Uwe]

Did you add "DEFINES += QWT_DLL" to your project file ?

Uwe

[swamyonline]

uwe,

thanks...finally it got solved on windows with that option. i think, i did not go through the qmake basics properly..now its clear.. thank u very much jacek and uwe...great help... keep going , hv a great time..bye