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copied!<p>You can't use the socket descriptor of a <code>QTcpSocket</code> object if it is already used by another <code>QTcpSocket</code> object. There is also no method of de-assigning it once is assigned to a <code>QTcpSocket</code></p> <p>Even if you don't explicitly use the initial <code>QTcpSocket</code>, if there is an event loop in the thread it was created (which is probably the case here), Qt will monitor it in that thread.</p> <p>As an alternative, you could:</p> <ul> <li>derive the <code>QTcpServer</code> class to redefine its <a href="http://qt-project.org/doc/qt-4.8/qtcpserver.html#incomingConnection" rel="nofollow"><code>incomingConnection(int socketDescriptor)</code></a> method to get that descriptor before it is assigned to a <code>QTcpSocket</code> instead of using <code>nextPendingConnection</code> <strong>OR</strong></li> <li><p>pass directly the <code>QTcpSocket</code> you receive from <code>nextPendingConnection</code> instead of the socket descriptor as a parameter to the thread constructor, and move it to the other thread (see <a href="http://qt-project.org/doc/qt-4.8/qtcpserver.html#notes" rel="nofollow">that note</a>):</p> <pre><code>TCPConnectThread(QTcpSocket *socket) : m_socket(socket) { m_socket−>setParent(0); // necessary to move the object to another thread m_socket->moveToThread(this); ... } </code></pre> <p>As the moving has to be done from the initial thread, the first alternative might be easier to do with a <code>QRunnable</code>, because you might not have access easily to the future <code>QThread</code> the runnable will be using.</p></li> </ul>

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