Hi everyone,
I have a trouble with QMessageBox::about(). My application works in tray icon. I created it using example source code from documentation. I have a QWidget, and when I click the "X" button my program still works in tray. And that`s cool. When this QWidget window is visible and I click the "About Application" item from TrayIcon menu my program doesn`t quit. BUT when the window is invisible (I mean just closed) and I click the about action item, whole program exits. It doesn`t matter if i use "X" button or PushButton. I was trying to change this invocation:

Qt Code: 
  1. void QIP::about()
  2. {
  3.  QMessageBox::about(this ,tr("About Application"),tr("<b> QIP v 0.2 </b><br/>"
  4. 						    "------------------<br/>"
  5. 						    "<b>Q</b>uick <b>I</b>p or <b>Q</b>t <b>I</b>p <br/>"
  6. 						    "2008 by Bartosz Dolewski"));
  7. }
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to this one:
Qt Code: 
  1. void QIP::about()
  2. {
  3.  QMessageBox::about(NULL ,tr("About Application"),tr("<b> QIP v 0.2 </b><br/>"
  4. 						    "------------------<br/>"
  5. 						    "<b>Q</b>uick <b>I</b>p or <b>Q</b>t <b>I</b>p <br/>"
  6. 						    "2008 by Bartosz Dolewski"));
  7. }
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It wasn`t change anything, maybe this about messagebox had not my icon from main window. Does anybody have some ideas ?
There are source code of whole *.cpp file:

Qt Code: 
  1. /***************************************************************************
  2.  *   Copyright (C) 2008 by Bartosz Dolewski  
  3.  *   E-mail: [email]doles2@gmail.com[/email]   
  4.  *                                                                         *
  5.  *   This program is free software; you can redistribute it and/or modify  *
  6.  *   it under the terms of the GNU General Public License as published by  *
  7.  *   the Free Software Foundation; either version 2 of the License, or     *
  8.  *   (at your option) any later version.                                   *
  9.  *                                                                         *
  10.  *   This program is distributed in the hope that it will be useful,       *
  11.  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12.  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13.  *   GNU General Public License for more details.                          *
  14.  *                                                                         *
  15.  *   You should have received a copy of the GNU General Public License     *
  16.  *   along with this program; if not, write to the                         *
  17.  *   Free Software Foundation, Inc.,                                       *
  18.  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19.  ***************************************************************************/
  20. #include "qip.h"
  21.  
  22. QIP::QIP(QWidget *parent, Qt::WFlags f) : QWidget(parent,f)
  23. {
  24.   ui.setupUi(this);
  25.  
  26.   QTextCodec::setCodecForTr (QTextCodec::codecForName ("UTF-8"));
  27.   setWindowTitle("QIP");
  28.   qDebug()<<"Program has started...\n";
  29.  
  30.   createNetworkList();
  31.   createTrayIcon();
  32.   createConnections();
  33.   //this->hide();
  34. }
  35.  
  36. void QIP::createNetworkList()
  37. {
  38.   //first of all we have to fill up our QList with interfaces which are found in this machine
  39.   qDebug()<<"Creating list of founded networks...\n";
  40.   networkList = QNetworkInterface::allInterfaces ();
  41.   foreach(QNetworkInterface NetInter, networkList)
  42.   {
  43.     if(NetInter.isValid())
  44.     {
  45.      ui.comboBox1->addItem(NetInter.name());
  46.     }
  47.   }
  48.  qDebug()<<"\t[+] NetworkList is done\n";
  49. }
  50.  
  51. void QIP::closeEvent(QCloseEvent *event)
  52.  {
  53.  //this function is a reimpletementation of closeEvent from QWidget.
  54.  //We would like to not quit from program if the user will click the X button of our window :)
  55.  //Just ignore this event, when X button is clicked, close the window not whole application
  56.      if (trayIcon->isVisible())
  57.      {
  58. 	hide();
  59.         event->ignore();
  60. 	isHidden = true;
  61. 	showHideAction->setText( tr("Show"));
  62.      }
  63.  }
  64.  
  65. void QIP::createTrayIcon()
  66. {
  67.   qDebug()<<"Building tray icon....\n";	
  68.   icon		   = QIcon (QString(":images/tray_icon.xpm"));
  69.   trayIcon         = new QSystemTrayIcon;
  70.   contextMenu      = new QMenu;
  71.   showHideAction   = new QAction(tr("Show"), this);
  72.   aboutApplication = new QAction(tr("About Application"),this);
  73.   quitApplication  = new QAction(tr("Quit Application"),this);
  74.   isHidden = false;	 
  75.   trayIcon->setIcon(icon);
  76.  
  77.   contextMenu->addAction(showHideAction);
  78.   contextMenu->addSeparator();
  79.   contextMenu->addAction(aboutApplication);
  80.   contextMenu->addSeparator();
  81.   contextMenu->addAction(quitApplication);
  82.   contextMenu->setDefaultAction(showHideAction);
  83.   qDebug()<<"\t[+] Tray icon has built\n";
  84.  
  85.  
  86.   showHideAction->setText( tr("Hide")); //default action :) We have just started and the window is visible
  87.   trayIcon->setContextMenu(contextMenu);
  88.   trayIcon->show();
  89. }
  90.  
  91. void QIP::createConnections()
  92. {
  93.   qDebug()<<"Building connections...\n";
  94.   connect(ui.pushButton1, SIGNAL(clicked()), 	  this, SLOT(showIP()));
  95.   connect(ui.pushButton2, SIGNAL(clicked()), 	  this, SLOT(showMAC()));
  96.   connect(ui.pushButton3, SIGNAL(clicked()),	  this, SLOT(showBroadcast()));
  97.   connect(ui.pushButton4, SIGNAL(clicked()), 	  this, SLOT(showNetmask()));
  98.   connect(ui.pushButton5, SIGNAL(clicked()),	  this, SLOT(refreshEverything()));
  99.   connect(ui.comboBox1,   SIGNAL(activated(int)), this, SLOT(setInterface(int)));
  100.   //connections from TrayIcon
  101.   connect(showHideAction,   SIGNAL(triggered()), this, SLOT(showHide()));
  102.   connect(quitApplication,  SIGNAL(triggered()), qApp, SLOT(quit()));
  103.   connect(aboutApplication, SIGNAL(triggered()), this, SLOT(about()));
  104.   //this line are also from TrayIcon :)
  105.   connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(trayIconClicked(QSystemTrayIcon::ActivationReason)));
  106.   qDebug()<<"\t[+] Connections have already created....\n";
  107. }
  108.  
  109. void QIP::showIP()
  110. {
  111.   qDebug()<<"showIP()...\n";
  112.   trayIcon->setToolTip("IP: " + ip);
  113.  if ( networkInterface.isValid() )
  114.     {
  115.         QList<QNetworkAddressEntry> entry = networkInterface.addressEntries();
  116.         ip = entry.at(0).ip().toString();
  117.     }
  118.     else
  119.     {
  120.         ip = "unknown";
  121.     }
  122.  
  123.  if (ui.lineEdit1->text() != ip)
  124.     {
  125. 	qDebug()<<"Setting IP adres to lineEdit1...\n";
  126. 	ui.lineEdit1->setText(ip);
  127. 	qDebug()<<"\t[+] Done...\n";
  128.     }
  129. }
  130. void QIP::showMAC()
  131. {
  132.  qDebug()<<"showMAC()...\n";
  133. 	if(networkInterface.isValid() )
  134. 	{
  135. 		mac = networkInterface.hardwareAddress();
  136. 	}
  137. 	else
  138. 	{
  139. 		mac = "unknown";
  140. 	}
  141.  
  142. 	if (ui.lineEdit2->text() != mac)
  143. 	{
  144. 		qDebug()<<"Setting up hardware address...\n";
  145. 		ui.lineEdit2->setText(mac);
  146. 		qDebug()<<"\t[+] Done...\n";
  147. 	}
  148.  
  149. }
  150.  
  151. void QIP::showBroadcast()
  152. {
  153.  qDebug()<<"showBroadcast...\n";
  154. 	if(networkInterface.isValid())
  155. 	{
  156. 		//broadcast = networkInterface.broadcast();
  157. 		 QList<QNetworkAddressEntry> entry = networkInterface.addressEntries();
  158.         	 broadcast = entry.at(0).broadcast().toString();
  159. 	}
  160. 	else
  161. 	{
  162. 		broadcast = "unknown";
  163. 	}
  164. 	if(ui.lineEdit3->text() != broadcast)
  165. 	{
  166. 		qDebug()<<"Setting up broadcast address...\n";
  167. 		ui.lineEdit3->setText(broadcast);
  168. 		qDebug()<<"\t[+] Done...\n";
  169. 	}
  170. }
  171. void QIP::showNetmask()
  172. {
  173.  qDebug()<<"showNetmask()...\n";
  174. 	if(networkInterface.isValid())
  175. 	{
  176. 		//netmask = networkInterface.netmask();
  177. 		 QList<QNetworkAddressEntry> entry = networkInterface.addressEntries();
  178.         	 netmask = entry.at(0).netmask().toString();
  179. 	}
  180. 	else
  181. 	{
  182. 		netmask = "unknown";
  183. 	}
  184. 	if(ui.lineEdit4->text() != netmask)
  185. 	{
  186. 		qDebug()<<"Setting up netmask address...\n";
  187. 		ui.lineEdit4->setText(netmask);
  188. 		qDebug()<<"\t[+] Done...\n";
  189. 	}
  190. }
  191.  
  192. void QIP::refreshEverything()
  193. {
  194. 	qDebug()<<"Refreshing all fields...\n";
  195. 	emit showIP();
  196. 	emit showMAC();
  197. 	emit showBroadcast();
  198. 	emit showNetmask();
  199. 	qDebug()<<"\t[+] Done...\n";
  200. }
  201.  
  202. void QIP::showHide()
  203. {
  204.     if ( isHidden )
  205.     {
  206.         this->show();
  207.         showHideAction->setText( tr("Hide"));
  208.         isHidden = false;
  209.     }
  210.  
  211.     else
  212.     {
  213.         this->hide();
  214.         showHideAction->setText( tr("Show"));
  215.         isHidden = true;
  216.     }
  217. }
  218.  
  219.  
  220. void QIP::trayIconClicked( QSystemTrayIcon::ActivationReason reason )
  221. {
  222.     if ( reason == QSystemTrayIcon::Trigger )
  223.     {
  224.         emit showHide();
  225.     }
  226. }
  227.  
  228. void QIP::about()
  229. {
  230.  QMessageBox::about(this ,tr("About Application"),tr("<b> QIP v 0.2 </b><br/>"
  231. 						    "------------------<br/>"
  232. 						    "<b>Q</b>uick <b>I</b>p or <b>Q</b>t <b>I</b>p <br/>"
  233. 						    "2008 by Bartosz Dolewski"));
  234. }
  235.  
  236. void QIP::setInterface(int index)
  237. {
  238.  qDebug()<<"Setting up new interface...\n";
  239.  networkInterface = networkList.at(index);
  240.  qDebug()<<"Network name: "<<networkInterface.name();
  241.  qDebug()<<"\t[+] Done...\n";
  242. }
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Thanks for any help,
Regards Bartek

PS: Sorry for my english (maybe "engrish" )