Fortune服務端展示了如何去創建一個多線程服務端。此實例與Fortune客戶端運行。

?首先繼承QTcpServer重寫下子類，方便實現多線程。

這里需要兩個類：一個是QTcpServer的子類，一個是QThread的子類

class FortuneServer : public QTcpServer{Q_OBJECTpublic:FortuneServer(QObject *parent = 0);protected:void incomingConnection(qintptr socketDescriptor) override;private:QStringList fortunes;};

重寫了QTcpServer的QTcpServer::incomingConnection()，使用list存儲服務端需要返回的字符串：

FortuneServer::FortuneServer(QObject *parent): QTcpServer(parent){fortunes << tr("You've been leading a dog's life. Stay off the furniture.")<< tr("You've got to think about tomorrow.")<< tr("You will be surprised by a loud noise.")<< tr("You will feel hungry again in another hour.")<< tr("You might have mail.")<< tr("You cannot kill time without injuring eternity.")<< tr("Computers are not intelligent. They only think they are.");}

QTcpServer::incomingConnection()中有個socketDescriptor參數，表示元素套接字描述符。這里FortuneThread有3個參數，一個是套接字描述符，一個是發送給客戶端的字符串，還有個是傳入的指向父節點的指針，并且關聯了信號和槽，當線程完成后現在會被指定釋放，使用start()運行。

void FortuneServer::incomingConnection(qintptr socketDescriptor){QString fortune = fortunes.at(QRandomGenerator::global()->bounded(fortunes.size()));FortuneThread *thread = new FortuneThread(socketDescriptor, fortune, this);connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));thread->start();}

FortuneThread繼承了QThread，重寫了run方法，業務功能是操作被對應的socket。并且有個錯誤信號：

class FortuneThread : public QThread{Q_OBJECTpublic:FortuneThread(int socketDescriptor, const QString &fortune, QObject *parent);void run() override;signals:void error(QTcpSocket::SocketError socketError);private:int socketDescriptor;QString text;};

Fortune構造函數：

FortuneThread::FortuneThread(int socketDescriptor, const QString &fortune, QObject *parent): QThread(parent), socketDescriptor(socketDescriptor), text(fortune){}

下面是run方法，首先創建一個QTcpSocket，然后設置socketDescriptor，用于操作本地套接字。

void FortuneThread::run(){QTcpSocket tcpSocket;if (!tcpSocket.setSocketDescriptor(socketDescriptor)) {emit error(tcpSocket.error());return;}

隨后構造數據：

QByteArray block;QDataStream out(&block, QIODevice::WriteOnly);out.setVersion(QDataStream::Qt_4_0);out << text;

最后進行TCP的分手：

tcpSocket.write(block);tcpSocket.disconnectFromHost();tcpSocket.waitForDisconnected();}

總結

以上是生活随笔為你收集整理的Qt文档阅读笔记-Threaded Fortune Server Example解析的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。