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50
51#ifndef CONNECTION_H
52#define CONNECTION_H
53
54#include <QCborStreamReader>
55#include <QCborStreamWriter>
56#include <QElapsedTimer>
57#include <QHostAddress>
58#include <QString>
59#include <QTcpSocket>
60#include <QTimer>
61
62static const int MaxBufferSize = 1024000;
63
64class Connection : public QTcpSocket
65{
66 Q_OBJECT
67
68public:
69 enum ConnectionState {
70 WaitingForGreeting,
71 ReadingGreeting,
72 ReadyForUse
73 };
74 enum DataType {
75 PlainText,
76 Ping,
77 Pong,
78 Greeting,
79 Undefined
80 };
81
82 Connection(QObject *parent = nullptr);
83 Connection(qintptr socketDescriptor, QObject *parent = nullptr);
84 ~Connection();
85
86 QString name() const;
87 void setGreetingMessage(const QString &message);
88 bool sendMessage(const QString &message);
89
90signals:
91 void readyForUse();
92 void newMessage(const QString &from, const QString &message);
93
94protected:
95 void timerEvent(QTimerEvent *timerEvent) override;
96
97private slots:
98 void processReadyRead();
99 void sendPing();
100 void sendGreetingMessage();
101
102private:
103 bool hasEnoughData();
104 void processGreeting();
105 void processData();
106
107 QCborStreamReader reader;
108 QCborStreamWriter writer;
109 QString greetingMessage;
110 QString username;
111 QTimer pingTimer;
112 QElapsedTimer pongTime;
113 QString buffer;
114 ConnectionState state;
115 DataType currentDataType;
116 int transferTimerId;
117 bool isGreetingMessageSent;
118};
119
120#endif
121

source code of qtbase/examples/network/network-chat/connection.h