QTcpSocket exception.

I'am have exception in this code:

Code:

---

void CSSocket::incomingData()
{
 
	char szData[4097];
 
	qint16 nRead = this->read(szData, 4096);
 
	if(nRead == 0)
	{
		this->disconnectFromHost();  // <-------- Exception !
		this->close();
		return;
	}
.....
.....
.....
}

---

why ???

What kind of exception? Could you provide more information?

Quote:

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Originally Posted by wysota

What kind of exception? Could you provide more information?

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Code:

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Unhandled exception at 0x64026dfa (QtNetworkd4.dll) in 
QMamManager.exe: 0xC0000005: 
Access violation writing location 0xfeeefeee.

---

in -> d:\qt4\src\network\qhostaddress.cpp

Code:

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void QHostAddressPrivate::clear()
{
    a = 0; // <-
    protocol = QAbstractSocket::UnknownNetworkLayerProtocol;
    isParsed = true;
    memset(&a6, 0, sizeof(a6));
}

---

Could you provide the back trace (call stack) from the debugger?

Quote:

---

Originally Posted by wysota

Could you provide the back trace (call stack) from the debugger?

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autos

Quote:

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- this 0xfeeefeee {a=??? a6={...} protocol=??? ...} QHostAddressPrivate * const
a CXX0030: Error: expression cannot be evaluated
+ a6 {c=0xfeeefef2 <Bad Ptr> } QIPv6Address
protocol CXX0030: Error: expression cannot be evaluated
+ ipString {??? size=???} QString
isParsed CXX0030: Error: expression cannot be evaluated
+ scopeId {??? size=???} QString

---

call stack

Quote:

---

> QtNetworkd4.dll!QHostAddressPrivate::clear() Line 242 + 0x3 bytes C++
QtNetworkd4.dll!QHostAddress::clear() Line 437 C++
QtNetworkd4.dll!QAbstractSocket::disconnectFromHos tImplementation() Line 2085 C++
QtNetworkd4.dll!QAbstractSocket::qt_metacall(QMeta Object::Call _c=InvokeMetaMethod, int _id=10, void * * _a=0x00126c64) Line 105 + 0x8 bytes C++
QtNetworkd4.dll!QTcpSocket::qt_metacall(QMetaObjec t::Call _c=InvokeMetaMethod, int _id=17, void * * _a=0x00126c64) Line 56 + 0x14 bytes C++
QMamManager.exe!CSSocket::qt_metacall(QMetaObject: :Call _c=InvokeMetaMethod, int _id=17, void * * _a=0x00126c64) Line 60 + 0x15 bytes C++
QtCored4.dll!QMetaObject::invokeMethod(QObject * obj=0x00a8e220, const char * member=0x64067ce4, Qt::ConnectionType type=DirectConnection, QGenericReturnArgument ret={...}, QGenericArgument val0={...}, QGenericArgument val1={...}, QGenericArgument val2={...}, QGenericArgument val3={...}, QGenericArgument val4={...}, QGenericArgument val5={...}, QGenericArgument val6={...}, QGenericArgument val7={...}, QGenericArgument val8={...}, QGenericArgument val9={...}) Line 973 + 0x1a bytes C++
QtCored4.dll!QMetaObject::invokeMethod(QObject * obj=0x00a8e220, const char * member=0x64067ce4, QGenericArgument val0={...}, QGenericArgument val1={...}, QGenericArgument val2={...}, QGenericArgument val3={...}, QGenericArgument val4={...}, QGenericArgument val5={...}, QGenericArgument val6={...}, QGenericArgument val7={...}, QGenericArgument val8={...}, QGenericArgument val9={...}) Line 363 + 0x72 bytes C++
QtNetworkd4.dll!QAbstractSocket::disconnectFromHos t() Line 2016 + 0xd7 bytes C++
QMamManager.exe!CSSocket::incomingData() Line 74 C++
QMamManager.exe!CSSocket::incomingData() Line 97 C++
QMamManager.exe!CSSocket::qt_metacall(QMetaObject: :Call _c=InvokeMetaMethod, int _id=0, void * * _a=0x00129134) Line 65 + 0x8 bytes C++
QtCored4.dll!QMetaObject::activate(QObject * sender=0x00a8e220, int from_signal_index=4, int to_signal_index=4, void * * argv=0x00000000) Line 3063 + 0x46 bytes C++
QtCored4.dll!QMetaObject::activate(QObject * sender=0x00a8e220, const QMetaObject * m=0x67204804, int local_signal_index=0, void * * argv=0x00000000) Line 3122 + 0x15 bytes C++
QtCored4.dll!QIODevice::readyRead() Line 79 + 0x12 bytes C++
QtNetworkd4.dll!QAbstractSocketPrivate::canReadNot ification() Line 545 C++
QtNetworkd4.dll!QAbstractSocketPrivate::readNotifi cation() Line 55 + 0x12 bytes C++
QtNetworkd4.dll!QAbstractSocketEngine::readNotific ation() Line 119 C++
QtNetworkd4.dll!QReadNotifier::event(QEvent * e=0x001299cc) Line 913 C++
QtGuid4.dll!QApplicationPrivate::notify_helper(QOb ject * receiver=0x00a90828, QEvent * e=0x001299cc) Line 3541 + 0x11 bytes C++
QtGuid4.dll!QApplication::notify(QObject * receiver=0x00a90828, QEvent * e=0x001299cc) Line 3100 + 0x10 bytes C++
QtCored4.dll!QCoreApplication::notifyInternal(QObj ect * receiver=0x00a90828, QEvent * event=0x001299cc) Line 516 C++
QtCored4.dll!QCoreApplication::sendEvent(QObject * receiver=0x00a90828, QEvent * event=0x001299cc) Line 185 + 0x39 bytes C++
QtCored4.dll!qt_internal_proc(HWND__ * hwnd=0x000403ae, unsigned int message=1024, unsigned int wp=5912, long lp=1) Line 241 + 0xf bytes C++
user32.dll!7e368724()
[Frames below may be incorrect and/or missing, no symbols loaded for user32.dll]
user32.dll!7e368806()
user32.dll!7e3689bd()
user32.dll!7e368a00()
QtCored4.dll!QEventDispatcherWin32::processEvents( QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 504 + 0x18 bytes C++
QtGuid4.dll!QGuiEventDispatcherWin32::processEvent s(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 975 + 0x15 bytes C++
QtCored4.dll!QCoreApplication::processEvents(QFlag s<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 666 C++
QMamManager.exe!CProjectManager::WaitRecived() Line 3994 + 0x10 bytes C++
QMamManager.exe!CProjectManager::Autorization() Line 3134 C++
QMamManager.exe!QMamManager::on_pushButton_clicked () Line 22 C++
QMamManager.exe!QMamManager::qt_metacall(QMetaObje ct::Call _c=InvokeMetaMethod, int _id=0, void * * _a=0x0012becc) Line 66 + 0x8 bytes C++
QtCored4.dll!QMetaObject::activate(QObject * sender=0x00a3d950, int from_signal_index=29, int to_signal_index=30, void * * argv=0x0012becc) Line 3063 + 0x46 bytes C++
QtCored4.dll!QMetaObject::activate(QObject * sender=0x00a3d950, const QMetaObject * m=0x6576f0d4, int from_local_signal_index=2, int to_local_signal_index=3, void * * argv=0x0012becc) Line 3142 + 0x15 bytes C++
QtGuid4.dll!QAbstractButton::clicked(bool _t1=false) Line 180 + 0x17 bytes C++
QtGuid4.dll!QAbstractButtonPrivate::emitClicked() Line 517 C++
QtGuid4.dll!QAbstractButtonPrivate::click() Line 509 C++
QtGuid4.dll!QAbstractButton::mouseReleaseEvent(QMo useEvent * e=0x0012c500) Line 1086 C++
QtGuid4.dll!QWidget::event(QEvent * event=0x0012c500) Line 6064 C++
QtGuid4.dll!QAbstractButton::event(QEvent * e=0x0012c500) Line 1048 C++
QtGuid4.dll!QPushButton::event(QEvent * e=0x0012c500) Line 651 C++
QtGuid4.dll!QApplicationPrivate::notify_helper(QOb ject * receiver=0x00a3d950, QEvent * e=0x0012c500) Line 3541 + 0x11 bytes C++
QtGuid4.dll!QApplication::notify(QObject * receiver=0x00a3d950, QEvent * e=0x0012c500) Line 3240 + 0x2f bytes C++
QtCored4.dll!QCoreApplication::notifyInternal(QObj ect * receiver=0x00a3d950, QEvent * event=0x0012c500) Line 516 C++
QtCored4.dll!QCoreApplication::sendSpontaneousEven t(QObject * receiver=0x00a3d950, QEvent * event=0x0012c500) Line 188 + 0x38 bytes C++
QtGuid4.dll!QETWidget::translateMouseEvent(const tagMSG & msg={...}) Line 2757 + 0x14 bytes C++
QtGuid4.dll!QtWndProc(HWND__ * hwnd=0x00040390, unsigned int message=514, unsigned int wParam=0, long lParam=917552) Line 1390 + 0xc bytes C++
user32.dll!7e368724()
user32.dll!7e368806()
user32.dll!7e3689bd()
user32.dll!7e368a00()
QtCored4.dll!QEventDispatcherWin32::processEvents( QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 504 + 0x18 bytes C++
QtGuid4.dll!QGuiEventDispatcherWin32::processEvent s(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 975 + 0x15 bytes C++
QtCored4.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 125 C++
QtCored4.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags={...}) Line 170 + 0x2d bytes C++
QtCored4.dll!QCoreApplication::exec() Line 735 + 0x15 bytes C++
QtGuid4.dll!QApplication::exec() Line 3039 C++
QMamManager.exe!main(int argc=1, char * * argv=0x003e7ee0) Line 10 + 0x6 bytes C++
QMamManager.exe!WinMain(HINSTANCE__ * instance=0x00400000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x00151f14, int cmdShow=1) Line 103 + 0x12 bytes C++
QMamManager.exe!__tmainCRTStartup() Line 578 + 0x35 bytes C
QMamManager.exe!WinMainCRTStartup() Line 403 C
kernel32.dll!7c816ff7()

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Something might be wrong with your stack. 0xfeeefeee seems to be a stack based address. I'd start by recompiling all objects to make sure your application doesn't go into places it shouldn't.

hmmm....
If i'am send from server command for disconnect client, i'am get signal disconnected()

Code:

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connect(this, SIGNAL(disconnected()), this, SLOT(OnCls()));

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Code:

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void CSSocket::OnCls()
{
	CProjectManager::GetPrjMng()->Reset();
 
}

---

slot work fine... but after quit, i'am get exception in line d->localAddress.clear();

Code:

---

#ifdef QT3_SUPPORT
    emit delayedCloseFinished(); // compat signal
#endif
    emit disconnected();
 
    d->localPort = 0;
    d->peerPort = 0;
    d->localAddress.clear(); <----
    d->peerAddress.clear();

---

Quote:

---

Originally Posted by wysota

Something might be wrong with your stack. 0xfeeefeee seems to be a stack based address. I'd start by recompiling all objects to make sure your application doesn't go into places it shouldn't.

---

solved :)
thank you for help ! :)

What was wrong?

Quote:

---

Originally Posted by wysota

What was wrong?

---

It is my mistake... I tried to cause methods after removal m_pSSocket

Code:

---

void CProjectManager::Reset()
{
	CProjectManager::GetPrjMng()->m_pSSocket->disconnectFromHost();  // now ok
	CProjectManager::GetPrjMng()->m_pSSocket->close(); // now ok
 
	//delete m_pSSocket;  <-- 
	//m_pSSocket = NULL; <--
...
...

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