Here is my code, and the error I get.

Thank you for your help.

Paolo

@
//---------------client---------------
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Client s;
return a.exec();
}

Client::Client()
{
QTcpSocket* socket = new QTcpSocket();
socket->connectToHost("127.0.0.1",12345);
}

Client::~Client()
{

}
//-------------------Server-------------------------------------

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Server server;
server.start();

return app.exec();
}

Server::Server(){
QObject::connect(this, SIGNAL(newConnection()), this, SLOT(newpending()));
}

void Server::start(){
listen(QHostAddress("127.0.0.1"),12345);
}
void Server::newpending(){
QTcpSocket* s = nextPendingConnection();
s->waitForConnected();
}
@

And the error is localised into : qtcoreapplication.h

inline bool QCoreApplication::sendEvent(QObject *receiver, QEvent *event)
{ if (event) event->spont = false; return self ? self->notifyInternal(receiver, event) : false; }

The log of the call stack:

QtCored4.dll!QCoreApplication::sendEvent(QObject * receiver=0x005df0d8, QEvent * event=0x003cd8a8) Line 231 + 0x39 bytes C++

QtCored4.dll!qt_internal_proc(HWND__ * hwnd=0x00250736, unsigned int message=1024, unsigned int wp=344, long lp=8) Line 488 + 0xf bytes C++

user32.dll!_InternalCallWinProc@20() + 0x23 bytes

user32.dll!_UserCallWinProcCheckWow@32() + 0xb7 bytes

user32.dll!_DispatchMessageWorker@8() + 0xed bytes

user32.dll!_DispatchMessageW@4() + 0xf bytes

QtCored4.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 814 C++

QtGuid4.dll!QGuiEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 1212 + 0x15 bytes C++

QtCored4.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 150 C++

QtCored4.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 204 + 0x2d bytes C++

QtCored4.dll!QCoreApplication::exec() Line 1221 + 0x15 bytes C++

QtGuid4.dll!QApplication::exec() Line 3824 C++

QTServer.exe!main(int argc=1, char * * argv=0x005d6530) Line 52 + 0x6 bytes C++

QTServer.exe!__tmainCRTStartup() Line 555 + 0x19 bytes C

QTServer.exe!mainCRTStartup() Line 371 C

kernel32.dll!764933aa()

ntdll.dll!___RtlUserThreadStart@8() + 0x27 bytes

ntdll.dll!__RtlUserThreadStart@8() + 0x1b bytes

First-chance exception at 0x7620c41f in QTServer.exe: Microsoft C++ exception: int at memory location 0x003cd2b0..

Thank you for your help