how we can access data of one project within other project?

[pratik041]

I want to use class of one project in other project.

[Rahul Das]

If you have common classes, you could make the libraries and use it.

"Using data of one project in another" ? i dont understand what are you asking :(

[sierdzio]

Either use libraries as Rahul suggested, or simply include the "old" headers in your new project (in this case, you need to remember to add those files to .pro, too).

[goetz]

HEADERS and SOURCES can take full paths. You just need to add them to you other project.

[pratik041]

[quote author="Volker" date="1323525174"]HEADERS and SOURCES can take full paths. You just need to add them to you other project.[/quote]

how can we add them to our projects. Can you give any example?

[sierdzio]

In .pro:
@
HEADERS = /path/to/old/headers/oldHeader.h
SOURCES = /path/to/old/sources/oldSource.cpp
@

In your new cpp header (or source):
@
#include "/path/to/old/headers/oldHeader.h"
@

[goetz]

@sierdzio

The include may not work, if it includes other headers of the old project too. Better add the path to the INCLUDEPATH variable.

[sierdzio]

Oh yes, correct. Just wrote the first thing that came to my mind.

[pratik041]

[quote author="sierdzio" date="1323599112"]In .pro:
@
HEADERS = /path/to/old/headers/oldHeader.h
SOURCES = /path/to/old/sources/oldSource.cpp
@

In your new cpp header (or source):
@
#include "/path/to/old/headers/oldHeader.h"
@[/quote]

I have tried this. Now i am able to access the other file object but while running the code i am getting error.
"No rule to make target '/Documents', needed by 'debug/documents.o' stop. "
Does i have to include any more file or any other thing?

[sierdzio]

Mate, we can't guess your setup... you have to investigate yourself, or at least give us more data. This error sometimes pops up when QMake was not rerun (clean the project, run qmake, build again), but most probably the cause is different.

[pratik041]

This is my both project which i am testing
@file_testing
main.cpp
#include <QtGui/QApplication>
#include "mainwindow.h"
#include "Documents and Settings/Pratik Agrawal/Desktop..........test1/mainwindow1.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
MainWindow1 w1;
w1.show();
w.show();
return a.exec();
}

mainwindow.cpp
#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
}

mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
MainWindow(QWidget *parent = 0);
~MainWindow();
};

#endif // MAINWINDOW_H
MainWindow::~MainWindow()
{
}

file_testing.pro
#-------------------------------------------------

Project created by QtCreator 2011-12-08T15:07:18

#-------------------------------------------------

QT += core gui

TARGET = file_testing

TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

HEADERS = Documents and Settings/Pratik Agrawal/............../test1/mainwindow1.h
SOURCES = Documents and Settings/Pratik Agraw........../Qt gui prgm/test1/mainwindow1.cpp

OTHER_FILES +=
data.txt
N.txt

RESOURCES +=
resource.qrc
@

The project which i want to access
test1
@
main.cpp
#include <QtGui/QApplication>
#include "mainwindow1.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow1 w;
w.show();

return a.exec();

}

mainwindow1.cpp
#include "mainwindow1.h"

MainWindow1::MainWindow1(QWidget *parent)
: QMainWindow(parent)
{
}

MainWindow1::~MainWindow1()
{

}

mainwindow1.h

#ifndef MAINWINDOW1_H
#define MAINWINDOW1_H

#include <QtGui/QMainWindow>

class MainWindow1 : public QMainWindow
{
Q_OBJECT

public:
MainWindow1(QWidget *parent = 0);
~MainWindow1();
};

#endif // MAINWINDOW1_H

test1.pro
#-------------------------------------------------

Project created by QtCreator 2011-12-12T09:55:33

#-------------------------------------------------

QT += core gui

TARGET = test1
TEMPLATE = app

SOURCES += main.cpp
mainwindow1.cpp

HEADERS += mainwindow1.h
@

[sierdzio]

You've got spaces in your paths (file_testing.pro). That is why qmake understands "Documents" as a file. I don't remember what a remedy for that was in qmake. Try either to enclose the whole path in quotes, or insert '' in front of every space (probably won't work, as '' is used in a different manner in qmake).

Apart from that, I am not sure you can use 2 QMainWindows in a single app (I've never tried to, though. And I can't find anything against it in QMW documentation, so maybe it's OK).

[Rahul Das]

@ w1.show();
w.show();@

This will work.Two different windows will turn up but 'w' will be on top of 'w1' and so w1will be hidden.

Why don't you consider to make one ,the child of other?

[pratik041]

[quote author="sierdzio" date="1323677232"]You've got spaces in your paths (file_testing.pro). That is why qmake understands "Documents" as a file. I don't remember what a remedy for that was in qmake. Try either to enclose the whole path in quotes, or insert '' in front of every space (probably won't work, as '' is used in a different manner in qmake).

Apart from that, I am not sure you can use 2 QMainWindows in a single app (I've never tried to, though. And I can't find anything against it in QMW documentation, so maybe it's OK).[/quote]

I have used two QMainWindow before also. Their is no problem in using that. As you have suggested
i have checked using double quotes but in that case also it is showing error that
@No rule to make target 'path/mainwindow1.cpp' needed by 'debug/mainwindow1.o' . Stop. @
I have checked removing spaces between the path also but i am getting the same error.

[sierdzio]

OK noticed another issue. In your code, you have this (shortened a bit for convenience):
@
SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

HEADERS = test1/mainwindow1.h
SOURCES = test1/mainwindow1.cpp
@

The second invoke of HEADERS and SOURCES is followed by '=', which means it will overwrite previous entries. Try this instead (remember to use your own paths):
@
SOURCES += main.cpp
mainwindow.cpp
test1/mainwindow1.cpp

HEADERS += mainwindow.h
test1/mainwindow1.h
@

[pratik041]

[quote author="sierdzio" date="1323681848"]OK noticed another issue. In your code, you have this (shortened a bit for convenience):
@
SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

HEADERS = test1/mainwindow1.h
SOURCES = test1/mainwindow1.cpp
@

The second invoke of HEADERS and SOURCES is followed by '=', which means it will overwrite previous entries. Try this instead (remember to use your own paths):
@
SOURCES += main.cpp
mainwindow.cpp
test1/mainwindow1.cpp

HEADERS += mainwindow.h
test1/mainwindow1.h
@[/quote]
On changing this i am getting undeclared error.

[goetz]

Do you use shadow builds with Qt Creator?

[Rahul Das]

The code you gave is working for me, except that i changed
the header in the first project 'file_testing' to
@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
MainWindow(QWidget *parent = 0);
~MainWindow(){};
};

#endif // MAINWINDOW_H@

I felt, the destructor was improperly positioned ;)

[pratik041]

[quote author="Volker" date="1323688757"]Do you use shadow builds with Qt Creator?[/quote]

yes i used shadow build.

[goetz]

[quote author="pratik041" date="1323690516"]
[quote author="Volker" date="1323688757"]Do you use shadow builds with Qt Creator?[/quote]

yes i used shadow build.[/quote]

Then I'm not 100% sure whether the approach I suggested does actually work as the directory layout is a bit delicate in that case.