Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.2.4
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None
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Windows
Description
I have written an application managing communications between two computers, using a single Ethernet wire, but two sockets (corresponding to two different ports). When an error occurs on a socket (whatever the type of the error), I'm disconnecting and deleting the two sockets. So, my code is something like this:
class DoubleSocket : public QObject { Q_OBJECT private: QSharedPointer<QTcpSocket> m_socket1; QSharedPointer<QTcpSocket> m_socket2; DoubleSocket(QString p_ip) : m_socket1(new QTcpSocket) , m_socket2(new QTcpSocket) { QObject::connect(m_socket1.data(), QAbstractSocket::errorOccured, this, DoubleSocket::disconnectAll); QObject::connect(m_socket2.data(), QAbstractSocket::errorOccured, this, DoubleSocket::disconnectAll); m_socket1->connectToHost(m_ip, 1024); m_socket1->connectToHost(m_ip, 1025); } void disconnectAll() { if (!m_socket1.isNull()) { m_socket1->disconnectFromHost(); m_socket1->waitForDisconnected(); m_socket1.reset(); } if (!m_socket2.isNull()) { m_socket2->disconnectFromHost(); m_socket2->waitForDisconnected(); m_socket2.reset(); } } };
To test it, I'm disconnecting the Ethernet wire. Then a crash occurs because: * The error detected on socket1 deletes the two sockets,
- The error on socket2 is also present. As it is a disconnect error, Qt internally executes the disconnectFromHost. But everything related to the second socket has already been deleted. This is this situation that creates a crash.
On my side I solved the problem by replacing the call of reset() by a call to deleteLater().