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QTcpSocket m_Socket;
m_Socket.connectToHost("127.0.0.1" , 1234);
cout << m_Socket.state() << endl;
m_Socket.waitForConnected();
cout << m_Socket.state() << endl;
if(m_Socket.state() == QTcpSocket::Connected)
{
// 这里可以进行连接后的操作
m_Socket.abort();
cout << m_Socket.state() << endl;
}