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g++ -Wl,-rpath,/opt/qt/4.4.0/lib -o ../../singleapplication-0.1/example main.o widget.o moc_widget.o moc_singleapplication.o    -L/opt/qt/4.4.0//lib -L/mnt/other/tmp/singleapplication-0.1 -lsingleapplication -lQtGui -L/opt/qt/4.4.0//lib -L/usr/X11R6/lib -lpng -lSM -lICE -pthread -pthread -lXi -lXrender -lXrandr -lfreetype -lfontconfig -lXext -lX11 -lQtNetwork -pthread -pthread -lQtCore -lz -lm -pthread -lgthread-2.0 -lrt -lglib-2.0 -lpthread -ldl
/usr/lib/gcc/i486-slackware-linux/4.1.2/../../../../i486-slackware-linux/bin/ld: cannot open output file ../../singleapplication-0.1/example: Is a directory
collect2: выполнение ld завершилось с кодом возврата 1
make: *** [../../singleapplication-0.1/example] Ошибка 1

1>------ Build started: Project: JulyView, Configuration: Release Win32 ------
1>Moc'ing singleapplication.h...
1>RCC julyview.qrc
1>MOC julyview.h
1>Compiling...
1>qrc_julyview.cpp
1>moc_julyview.cpp
1>main.cpp
1>julyview.cpp
1>Generating Code...
1>Compiling...
1>moc_singleapplication.cpp
1>Linking...
1>main.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall SingleApplication::~SingleApplication(void)" (??1SingleApplication@@UAE@XZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: bool __thiscall SingleApplication::sendMessage(class QString const &,int)" (?sendMessage@SingleApplication@@QAE_NABVQString@@H@Z) referenced in function _main
1>moc_singleapplication1.obj : error LNK2001: unresolved external symbol "public: bool __thiscall SingleApplication::sendMessage(class QString const &,int)" (?sendMessage@SingleApplication@@QAE_NABVQString@@H@Z)
1>main.obj : error LNK2019: unresolved external symbol "public: bool __thiscall SingleApplication::isRunning(void)const " (?isRunning@SingleApplication@@QBE_NXZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall SingleApplication::SingleApplication(class QString const &,class QObject *)" (??0SingleApplication@@QAE@ABVQString@@PAVQObject@@@Z) referenced in function _main
1>release\JulyView.exe : fatal error LNK1120: 4 unresolved externals
1>Build log was saved at "file://c:\singleapplication-0.1\JulyView\release\BuildLog.htm"
1>JulyView - 6 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

1>------ Build started: Project: JulyView, Configuration: Release Win32 ------
1>RCC julyview.qrc
1>MOC singleapplication.h
1>MOC julyview.h
1>Compiling...
1>qrc_julyview.cpp
1>moc_singleapplication.cpp
1>.\Release\moc_singleapplication.cpp(47) : warning C4273: 'staticMetaObject' : inconsistent dll linkage
1>        c:\julyview\julyview\release\../singleapplication.h(33) : see previous definition of 'public: static QMetaObject const SingleApplication::staticMetaObject'
1>.\Release\moc_singleapplication.cpp(47) : error C2491: 'SingleApplication::staticMetaObject' : definition of dllimport static data member not allowed
1>.\Release\moc_singleapplication.cpp(53) : warning C4273: 'SingleApplication::metaObject' : inconsistent dll linkage
1>        c:\julyview\julyview\release\../singleapplication.h(33) : see previous definition of 'metaObject'
1>.\Release\moc_singleapplication.cpp(58) : warning C4273: 'SingleApplication::qt_metacast' : inconsistent dll linkage
1>        c:\julyview\julyview\release\../singleapplication.h(33) : see previous definition of 'qt_metacast'
1>.\Release\moc_singleapplication.cpp(66) : warning C4273: 'SingleApplication::qt_metacall' : inconsistent dll linkage
1>        c:\julyview\julyview\release\../singleapplication.h(33) : see previous definition of 'qt_metacall'
1>.\Release\moc_singleapplication.cpp(85) : warning C4273: 'SingleApplication::messageReceived' : inconsistent dll linkage
1>        c:\julyview\julyview\release\../singleapplication.h(41) : see previous definition of 'messageReceived'
1>moc_julyview.cpp
1>main.cpp
1>julyview.cpp
1>Generating Code...
1>Build log was saved at "file://c:\JulyView\JulyView\release\BuildLog.htm"
1>JulyView - 1 error(s), 5 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

#ifdef Q_OS_WIN
#	ifdef SINGLE_APPLICATION_DLL
#		ifdef SINGLE_APPLICATION_BUILD_LIB
#			define SINGLE_APPLICATION_EXPORT Q_DECL_EXPORT
#		else
#			define SINGLE_APPLICATION_EXPORT Q_DECL_IMPORT
#		endif
#	endif
#endif
#ifndef SINGLE_APPLICATION_EXPORT
#	define SINGLE_APPLICATION_EXPORT
#endif

#ifdef Q_OS_WIN
#	ifdef SINGLE_APPLICATION_DLL
#		ifndef SINGLE_APPLICATION_BUILD_LIB
#			define SINGLE_APPLICATION_EXPORT Q_DECL_EXPORT
#		else
#			define SINGLE_APPLICATION_EXPORT Q_DECL_IMPORT
#		endif
#	endif
#endif
#ifndef SINGLE_APPLICATION_EXPORT
#	define SINGLE_APPLICATION_EXPORT
#endif

LIB_CONFIG = staticlib
#LIB_CONFIG = dll

LocalThread::LocalThread(quintptr socketDescriptor, const QString& name, QObject* parent) : QThread(parent)
{
	this->socketDescriptor = socketDescriptor;
	this->name = name;
}

LocalThread::~LocalThread()
{
}

void LocalThread::run()
{
	QLocalSocket socket;
	if(!socket.setSocketDescriptor(socketDescriptor) || socket.state() != QLocalSocket::ConnectedState)
		return;

	// send app_id to client
	if(!writeMessage(&socket, name))
		return;

	// wait to messages from client
	while(socket.state() == QLocalSocket::ConnectedState)
	{
		if(socket.waitForReadyRead(1000))
		{
//			...
		}
	}
}

LocalThread::LocalThread(quintptr socketDescriptor, const QString& name, QObject* parent) : QThread(parent)
{
	this->socketDescriptor = socketDescriptor;
	this->name = name;
}

LocalThread::~LocalThread()
{
    if (!isRunning())
        return;	
	
    stop();
    wait();
}

void LocalThread::stop()
{
	QMutexLocker locker( &m_stopMutex );
	m_stopped = true;
}

void LocalThread::run()
{
	m_stopMutex.lock();
	m_stopped = false;
	m_stopMutex.unlock(); 

	QLocalSocket socket;
	if(!socket.setSocketDescriptor(socketDescriptor) || socket.state() != QLocalSocket::ConnectedState)
		return;

	// send app_id to client
	if(!writeMessage(&socket, name))
		return;

	// wait to messages from client
	while(socket.state() == QLocalSocket::ConnectedState && !m_stopped)
	{
		if(socket.waitForReadyRead(1000))
		{
//			...
		}
	}
}

#include <QtCore/QObject>
#include <QtCore/QString>
#include <QtGui/QApplication>

#include "mainwindow.h"
#include "singleapplication.h"

#ifdef Q_WS_WIN
#include <QtCore/QLibrary>
typedef int (*ASFW_Func) (qint32);
#endif

int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	QStringList args = app.arguments();
	args.removeFirst();
	QString message = args.join(" ");

#ifdef Q_WS_WIN
	ASFW_Func AllowSetForegroundWindow = (ASFW_Func) QLibrary::resolve("user32", "AllowSetForegroundWindow");
	if (AllowSetForegroundWindow) 
		AllowSetForegroundWindow(-1);
#endif

	SingleApplication instance("LoaderExample");
	if(instance.isRunning())
	{
		if(instance.sendMessage(message))
			return 0;
	}

	MainWindow mw;
	mw.handleMessage(message);
	mw.show();

	QObject::connect(&instance, SIGNAL(messageReceived(const QString&)),
		&mw, SLOT(handleMessage(const QString&)));

	return app.exec();
}

#ifdef Q_WS_WIN
	#include <QtCore/QLibrary>
	#include <windows.h>

	typedef BOOL (*ASFW_Func) (DWORD);
#endif

#ifdef Q_WS_WIN
	ASFW_Func asfw = (ASFW_Func) QLibrary::resolve("user32", "AllowSetForegroundWindow");
	if (asfw) 
		asfw(-1);
#endif

#ifdef Q_WS_WIN
// WindowsNT4   0x0400
// Windows2000  0x0500
// WindowsXP    0x0501
// Windows2003  0x0502
// WindowsVista 0x0600
#	define _WIN32_WINNT 0x0501
#	include <windows.h>
#endif

int main(int argc, char* argv[])
{
#ifdef Q_WS_WIN
	AllowSetForegroundWindow(ASFW_ANY);
#endif
//...

Warning: QObject: Cannot create children for a parent that is in a different thread.
(Parent is QLocalServer(0x636084), parent's thread is QThread(0x185b7e0), current thread is ServerThread(0x636078)

Warning: QWinEventNotifier: event notifiers cannot be disabled from another thread
Warning: QWaitCondition: Destroyed while threads are still waiting