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chat.cpp Example File
dbus/dbus-chat/chat.cpp

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 #include "chat.h"
 #include <QtGui/QApplication>
 #include <QtGui/QMessageBox>

 #include "chat_adaptor.h"
 #include "chat_interface.h"

 ChatMainWindow::ChatMainWindow()
     : m_nickname(QLatin1String("nickname"))
 {
     setupUi(this);
     sendButton->setEnabled(false);

     connect(messageLineEdit, SIGNAL(textChanged(QString)),
             this, SLOT(textChangedSlot(QString)));
     connect(sendButton, SIGNAL(clicked(bool)), this, SLOT(sendClickedSlot()));
     connect(actionChangeNickname, SIGNAL(triggered(bool)), this, SLOT(changeNickname()));
     connect(actionAboutQt, SIGNAL(triggered(bool)), this, SLOT(aboutQt()));
     connect(qApp, SIGNAL(lastWindowClosed()), this, SLOT(exiting()));

     // add our D-Bus interface and connect to D-Bus
     new ChatAdaptor(this);
     QDBusConnection::sessionBus().registerObject("/", this);

     com::trolltech::chat *iface;
     iface = new com::trolltech::chat(QString(), QString(), QDBusConnection::sessionBus(), this);
     //connect(iface, SIGNAL(message(QString,QString)), this, SLOT(messageSlot(QString,QString)));
     QDBusConnection::sessionBus().connect(QString(), QString(), "com.trolltech.chat", "message", this, SLOT(messageSlot(QString,QString)));
     connect(iface, SIGNAL(action(QString,QString)), this, SLOT(actionSlot(QString,QString)));

     NicknameDialog dialog;
     dialog.cancelButton->setVisible(false);
     dialog.exec();
     m_nickname = dialog.nickname->text().trimmed();
     emit action(m_nickname, QLatin1String("joins the chat"));
 }

 ChatMainWindow::~ChatMainWindow()
 {
 }

 void ChatMainWindow::rebuildHistory()
 {
     QString history = m_messages.join( QLatin1String("\n" ) );
     chatHistory->setPlainText(history);
 }

 void ChatMainWindow::messageSlot(const QString &nickname, const QString &text)
 {
     QString msg( QLatin1String("<%1> %2") );
     msg = msg.arg(nickname, text);
     m_messages.append(msg);

     if (m_messages.count() > 100)
         m_messages.removeFirst();
     rebuildHistory();
 }

 void ChatMainWindow::actionSlot(const QString &nickname, const QString &text)
 {
     QString msg( QLatin1String("* %1 %2") );
     msg = msg.arg(nickname, text);
     m_messages.append(msg);

     if (m_messages.count() > 100)
         m_messages.removeFirst();
     rebuildHistory();
 }

 void ChatMainWindow::textChangedSlot(const QString &newText)
 {
     sendButton->setEnabled(!newText.isEmpty());
 }

 void ChatMainWindow::sendClickedSlot()
 {
     //emit message(m_nickname, messageLineEdit->text());
     QDBusMessage msg = QDBusMessage::createSignal("/", "com.trolltech.chat", "message");
     msg << m_nickname << messageLineEdit->text();
     QDBusConnection::sessionBus().send(msg);
     messageLineEdit->setText(QString());
 }

 void ChatMainWindow::changeNickname()
 {
     NicknameDialog dialog(this);
     if (dialog.exec() == QDialog::Accepted) {
         QString old = m_nickname;
         m_nickname = dialog.nickname->text().trimmed();
         emit action(old, QString("is now known as %1").arg(m_nickname));
     }
 }

 void ChatMainWindow::aboutQt()
 {
     QMessageBox::aboutQt(this);
 }

 void ChatMainWindow::exiting()
 {
     emit action(m_nickname, QLatin1String("leaves the chat"));
 }

 NicknameDialog::NicknameDialog(QWidget *parent)
     : QDialog(parent)
 {
     setupUi(this);
 }

 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);

     if (!QDBusConnection::sessionBus().isConnected()) {
         qWarning("Cannot connect to the D-BUS session bus.\n"
                  "Please check your system settings and try again.\n");
         return 1;
     }

     ChatMainWindow chat;
     chat.show();
     return app.exec();
 }