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List:       kde-devel
Subject:    KDE3 Session Management
From:       Torsten Foertsch <torsten.foertsch () gmx ! net>
Date:       2009-02-17 7:49:18
Message-ID: 200902170849.19036.torsten.foertsch () gmx ! net
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Hi,

I have registered for this list only a few minutes ago. Hence, I am not 
sure if it is the right one for my question. If not please refer me to 
the right place.

Also, I must say this is my first attempt in KDE programming and my C++ 
skills are quite low. I am a C and Perl programmer mainly.

That said, I have got a KDE3 application that creates a systray icon. It 
doesn't have a KMainWindow. The main object of the application is a 
KApplication.

Now I want to preserve some state over a shutdown/startup cycle. In the 
docs to KApplication I have found the saveYourself function. But it is 
marked as deprecated. Instead one should use KSessionManaged. Then 
there comes this sentence:

> For purposes without KMainWindow, create an instance of
> KSessionManaged and reimplement the functions
> KSessionManaged::commitData() and/or KSessionManaged::saveState()

With my limited C++ wits I have translated that into: "create a class 
that inherits from KSessionManaged and implement there commitData and 
saveState." Is that correct?

So, I did the following (MyApp inherits from KApplication):

MySession::MySession(MyApp* app)
  : KSessionManaged()
{
  fprintf(stderr, "Session Constructor\n");
  appInstance=app;
  ...
}

bool MySession::saveState(QSessionManager& sm)
{
  KConfig* conf=appInstance->sessionConfig();

  fprintf(stderr, "saveState\n");
  conf->setGroup(QString::fromLatin1("Restore"));
  conf->writeEntry(QString::fromLatin1("ExecMode"), execMode);
  ...

  return true;
}
 
bool MySession::commitData(QSessionManager& sm) {
  return true;
}

MySession::~MySession() {}

But it doesn't work. I see the constructor is called. But it seems 
saveState is not. At least I don't see the printout even if stderr is 
redirected to a file. And there is no file called "myapp_..." in 
~/.kde/share/config/session.

How to make it work?

What would be the best way to go with future porting to KDE4 in mind?

Thanks,
Torsten
 
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