Qt client/server architecture doesn't work for my embedded linux platform

Hello, guys
I want to make my Qt embedded app work as client-server architecture,
a QApplication that start with "-qws" or create with "QApplication::GuiServer" would play as a server, and the others QApplication the create with "QApplication::GuiClient" play as a client.

start the server app first, and then start the client app.

the problems is:
1. In server code, I set the max window rect to QRect(100, 100, 400, 300) via QWSServer::setMaxWindowRect();
In server application, the rect of widget_1 is QRect(100, 100, 400, 300), that is correct.
But in client app, the label_2 show full screen. I think this is wrong.
if I use QWSServer::setMaxWindowRect in client app, the max rect of label_2 is ok.

2. I connect the qws window event signal to my custom slot, and debug the window name, the server widget_1(QWidget) come into this slot, but I don't see the label_2(QLabel) come.

It seems that the client application play as a server itself, not a client of my server app, so the client doesn't respond to the server.

what is going wrong with my code ?

see code below:

server code:

Code:

---

int main(int argc, char *argv[])
{
    QApplication app(argc, argv, QApplication::GuiServer);
    Server srv;
 
    QWidget widget_1;
    widget_1.showMaximized();
 
    return app.exec();
}
 
#ifndef _SERVER_H_
#define _SERVER_H_
 
class Server : public QObject
{
    Q_OBJECT
 
public:
    Server(QObject *parent = NULL);
    ~Server();
 
Q_SIGNALS:
 
public Q_SLOTS:
 
protected:
 
private Q_SLOTS:
    void windowEventHandler(QWSWindow *, QWSServer::WindowEvent);
 
private:
    QWSServer *server;
};
 
#endif // _SERVER_H_
 
Server::Server(QObject *parent)
: QObject(parent)
{
	// init qws server
	server = QWSServer::instance();
	QWSServer::setMaxWindowRect(QRect(100, 100, 400, 300));
	connect(server, SIGNAL(windowEvent(QWSWindow*, QWSServer::WindowEvent)),
			this, SLOT(windowEventHandler(QWSWindow*, QWSServer::WindowEvent)));
}
 
Server::~Server()
{
 
}
 
void Server::windowEventHandler(QWSWindow *window, QWSServer::WindowEvent eventType)
{
	qDebug() << "Server::windowEventHandler" << window->name();
}

---

client code:

Code:

---

int main(int argc, char *argv[])
{
    QApplication app(argc, argv, QApplication::GuiClient);
 
    QLabel label_2;
    label_2.showMaximized();
 
    return app.exec();
}

---

and something I need to mention is I running Qt-4.5.3 on a arm-linux platform,
for Qt performance, I had most of Qt feature disabled.
Is this could be the problem?

see my qconfig file attached.

/WX

1. I also tried QProcess to start my client app, got the same result.

2. I testing the QCopChannel communication. It is ok if two channel object in the same QApplication(process), but if I create the channels in different QApplication(process), they can not receive each other.

So, it sound like that QCopChannel are broken by something ?

/WX

OK, after looking the fucking source code, I found that this is because I disable the QWS MultiProcess feature in my qconfig file.

It seems that the Qt maybe unstable if I disable lots of features.
Could somebody please help me to check my qconfig file(attached in this thread), and found out if any critical Qt kernel features are disabled?

Thanks....

/WX