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C++ (Qt)
// Main function.
int main(int argc, char *argv[])
{
    // App obj.
    QCoreApplication a(argc, argv);
 
    try
    {
        // Set app props.
        QCoreApplication::setApplicationName ( "myappname" );
 
        // Output obj.
        OutputData output;
        output.outputHead();
 
        // ** Read setting - name of local server to connect to.Begin. *************************
        const QString strSettingFilename = "myapp.ini";
        const QString strUnknownSetting = "unknown_name";
        QSettings setting ( qApp->applicationDirPath() + "/" + strSettingFilename, QSettings::IniFormat );
        const QString strServerName = setting.value ( "my_server/my_server-name", strUnknownSetting ).toString();
        if ( strServerName == strUnknownSetting )
            throw new CustomException ( "can't load local server name" );
        // ** Read setting - name of local server to connect to.End. ***************************
 
        // ** Get commands from cmd line.Begin. ******************
        const QStringList listCommands = a.arguments();
        if ( listCommands.count() <= 1 ) // Need to have at least 1 parameter. (Not including app filename, that is the first param).
            throw new CustomException ( "there are no parameters passed into this application" );
        // ** Get commands from cmd line.End. ********************
 
        // Smart Socket object.
        SmartSocket socket ( strServerName, listCommands );
 
        // Connections.Begin.
        // Redirecting information messages to console.
        if ( !QObject::connect ( &socket, SIGNAL ( notifyInfo_signal ( const QString& ) ), &output, SLOT ( outputData_slot ( const QString& ) ) ) )
            throw new CustomException ( "can't connect the mechanism of redirecting information messages from socket to console" );
        // Redirecting error messages to console.
        if ( !QObject::connect ( &socket, SIGNAL ( notifyError_signal ( const QString& ) ), &output, SLOT ( outputData_slot ( const QString& ) ) ) )
            throw new CustomException ( "can't connect the mechanism of redirecting error messages from socket to console" );
        // Quiting from app mechanism.
        if ( !QObject::connect ( &socket, SIGNAL ( exit_signal() ), &a, SLOT ( quit() ) ) )
            throw new CustomException ( "can't connect the quiting from app mechanism" );
        // Starting work mechanism.
        // Connections.End.
 
        // Start the work.
        socket.startWorking_slot();  [color=red][b]// Вот этот слот мне нужно запустить после a.exec(), a не до него[/b][/color]
 
        // Exec app.
        int retCode = a.exec();
 
        // Output exiting text.
        output.outputFoot();
 
        // Return from app.
        return retCode;
    }
    catch ( CustomException* e )
    {
        std::cout << "Error: " << e->getErrorString() << "." << std::endl
                  << "Exiting from " << qApp->applicationName().toStdString() << "." << std::endl;
        delete e;
    }
    catch (...)
    {
        std::cout << "Unknown error." << std::endl
                  << "Exiting from " << qApp->applicationName().toStdString() << "." << std::endl;
    }
 
    return 1; // Return from app whith error.
}
 

C++ (Qt)
QMetaObject::invokeMethod( &socket, "startWorking_slot" );