How can i prevent my app open multiple times with Qt?

vsorokin

Open INSTALL.TXT file, and read how you can build QtSingleApplication as Shared Library. after you would do it, you can use QtSingleApplication Library in you program. See examples in examples directory.

Leon

[quote author="Vass" date="1315761368"]Open INSTALL.TXT file, and read how you can build QtSingleApplication as Shared Library. after you would do it, you can use QtSingleApplication Library in you program. See examples in examples directory.[/quote]

Can't install it.. It keeps saying the same message:
!http://img690.imageshack.us/img690/4669/screenshotqtsingleappli.png(screen)!

DenisKormalev

Have you tried to run qmake and make commands? :)

Leon

yeah... qmake -> make -> ./configure
just the same message...

DenisKormalev

Why do you run configure as last element? It should be executed first.

lgeyer

It is ./configure -> qmake -> make.

Leon

O was reading not configured, when it is now configured..
So i quess now i completed the 3rd step of the install.txt. So after that what? The txt file is really messed up.

I still have an error when including the QtSingleApplication.

lgeyer

Are you using the QtSingleApplication files directly or are you using them as a library?
If so, did the library compile without any errors? If not, which?
What errors do you have when including QtSingleApplication?

Leon

Ok so here is the complete outpout of ./configure -> qmake -> make ( http://paste.ubuntu.com/688207/ )
After doing that i am including QtSingleApplication at my app and it says QtSingleApplication is not declared.

lgeyer

Build looks fine. Have you set up include path correctly? Have you even included the neccessary header files?

Leon

So you mean copying the qtsinglecoreapplication.h file at my project directory and then
@#include "qtsingleapplication.h"
@
?

lgeyer

The usual way is to add the path to the include path in your project file.
@
INCLUDEPATH += <location_of_qtsingleapplication_headers>
@
In addition, the QtSingleApplication libraries have to be added too.
@
LIBS += -L<location_of_qtsingleapplication_libraries>
LIBS += -l<name_of_qtsingleapplication_library>
@
And - of course - you will have to include the headers in your sources files too.
@
#include <QtSingleApplication>
@

Leon

So whats wrong with that:
@INCLUDEPATH += <~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src>
LIBS += -L<~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src>
LIBS += -l<~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src/qtsinglecoreapplication.h>@
?

vsorokin

Remove < and > simbols

Leon

Forgot.
@INCLUDEPATH += ~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src
LIBS += -L~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src
LIBS += -l~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src/qtsinglecoreapplication.h@

But still i cant
@#include <QtSingleApplication>@
at my cpp file.

P.S Should it have a spece between -l and ~ symbol.?

vsorokin

Try this

@INCLUDEPATH += ~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src
LIBS += -L~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src
LIBS += -lqtsinglecoreapplication
@

Leon

The same. I can only include the "qtsingleapplication.h".

P.S I have reopened qt so as to refresh.

lgeyer

There are two ways on how to use QtSingleApplication:

You add the sources directly to your project or
You compile QtSingleApplication into a library and your application links against this library

#1 requires you to add all of the QtSingleApplication sources to your application. The easiest way to do is including the qtsingleapplication.pri from the src directory.
@
// .pro
include(../qtsingleapplication/src/qtsingleapplication.pri)
@

#2 requires you to build the library first
@
// shell
./configure -library
qmake
make
@
and then reference it in your project file
@
// .pro
INCLUDEPATH += ../qtsingleapplication/src
LIBS += -L../qtsingleapplication/lib
LIBS += -lQtSolutions_SingleApplication-head
@

Leon

How should it be with the first way?
@include(~/Downloads/qt-solutions-qt-solutions/qtsingleapplication/src/qtsingleapplication.pri)
@
?

P.S All this sounds a bit complicated, and if someone wants to compile my app they must download qtsingleapplication librarie. Should i stay with the command pidof or QtSingleApplication will be better?

lgeyer

It is as complicated as integrating any other third party code or library. QtSingleApplications license allows you to redistribute it along with your code. So if you have set it up properly there is no extra work for "someone".

I would go with QtSingleApplication. It is much less error-prone than the pidof approach.