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服务端头文件
#ifndef SERVER_H
#define SERVER_H#include <QWidget>
#include <QLabel>
#include <QPushButton>
#include <QLocalServer>class Server : public QWidget
{Q_OBJECTpublic:explicit Server(QWidget *parent = nullptr);private slots:void sendFortune();private:QLocalServer *server;QStringList fortunes;
};
#endif // SERVER_H
服务端实现文件
#include "server.h"
#include "ui_server.h"#include <QMessageBox>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QByteArray>
#include <QRandomGenerator>
#include <QLocalSocket>Server::Server(QWidget *parent): QWidget(parent)
{setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);server = new QLocalServer(this);if (!server->listen("fortune")) {QMessageBox::critical(this, tr("Local Fortune Server"),tr("Unable to start the server: %1").arg(server->errorString()));close();return ;}QLabel *statusLabel = new QLabel;statusLabel->setWordWrap(true);statusLabel->setText(tr("The server is running, Run the Local Fortune CLient example now."));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.");QPushButton *quitButton = new QPushButton(tr("Quit"));quitButton->setAutoDefault(false);connect(quitButton, &QPushButton::clicked, this, &Server::close);connect(server, &QLocalServer::newConnection, this, &Server::sendFortune);QHBoxLayout *buttonLayout = new QHBoxLayout;buttonLayout->addStretch();buttonLayout->addWidget(quitButton);buttonLayout->addStretch();QVBoxLayout *mainLayout = new QVBoxLayout(this);mainLayout->addWidget(statusLabel);mainLayout->addLayout(buttonLayout);setWindowTitle(QGuiApplication::applicationDisplayName());
}void Server::sendFortune()
{QByteArray block;QDataStream out(&block, QIODevice::WriteOnly);out.setVersion(QDataStream::Qt_5_10);const int fortuneIndex = QRandomGenerator::global()->bounded(0, fortunes.size());const QString &message = fortunes.at(fortuneIndex);out << quint32(message.size());out << message;// 将下一个挂起的连接作为已连接的QLocalSocket对象返回QLocalSocket *clientConnection = server->nextPendingConnection();// 断开时删除对象connect(clientConnection, &QLocalSocket::disconnected, clientConnection, &QLocalSocket::deleteLater);// 将数据中最多maxSize字节的数据写入设备。返回实际写入的字节数，如果发生错误，则返回-1clientConnection->write(block);// 写入套接字clientConnection->flush();// 尝试关闭套接字clientConnection->disconnectFromServer();
}
客户端头文件
#ifndef CLIENT_H
#define CLIENT_H#include <QWidget>
#include <QLocalSocket>
#include <QDataStream>
#include <QLineEdit>
#include <QLabel>
#include <QPushButton>class Client : public QWidget
{Q_OBJECTpublic:explicit Client(QWidget *parent = nullptr);private slots:void requestNewFortune();void readFortune();void displayError(QLocalSocket::LocalSocketError socketError);void enableGetFortuneButton();private:QLineEdit *hostLineEdit;QPushButton *getFortuneButton;QLabel *statusLabel;QLocalSocket *socket;QDataStream in;quint32 blockSize;QString currentFortune;
};
#endif // CLIENT_H
客户端实现文件
#include "client.h"
#include "ui_client.h"#include <QDialogButtonBox>
#include <QGridLayout>
#include <QTimer>
#include <QMessageBox>Client::Client(QWidget *parent): QWidget(parent), hostLineEdit(new QLineEdit("fortune")), getFortuneButton(new QPushButton(tr("Get Fortune"))), statusLabel(new QLabel(tr("This examples requires that you run the Local Fortune Server example as well"))), socket(new QLocalSocket(this))
{setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);QLabel *hostLabel = new QLabel(tr("&Server name: "));hostLabel->setBuddy(hostLineEdit);statusLabel->setWordWrap(true);getFortuneButton->setDefault(true);QPushButton *quitButton = new QPushButton(tr("Quit"));QDialogButtonBox *buttonBox = new QDialogButtonBox;buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole);buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);in.setDevice(socket);in.setVersion(QDataStream::Qt_5_10);connect(hostLineEdit, &QLineEdit::textChanged, this, &Client::enableGetFortuneButton);connect(getFortuneButton, &QPushButton::clicked, this, &Client::requestNewFortune);connect(quitButton, &QPushButton::clicked, this, &Client::close);connect(socket, &QLocalSocket::readyRead, this, &Client::readFortune);connect(socket, QOverload<QLocalSocket::LocalSocketError>::of(&QLocalSocket::error), this, &Client::displayError);QGridLayout *mainLayout = new QGridLayout(this);mainLayout->addWidget(hostLabel, 0, 0);mainLayout->addWidget(hostLineEdit, 0, 1);mainLayout->addWidget(statusLabel, 2, 0, 1, 2);mainLayout->addWidget(buttonBox, 3, 0, 1, 2);setWindowTitle(QGuiApplication::applicationDisplayName());hostLineEdit->setFocus();}void Client::requestNewFortune()
{getFortuneButton->setEnabled(false);blockSize = 0;// 中止当前连接并重置套接字socket->abort();// 尝试与server建立连接socket->connectToServer(hostLineEdit->text());
}void Client::readFortune()
{if (blockSize == 0) {if (socket->bytesAvailable() < (int)sizeof (quint32)) {return ;}in >> blockSize;}if (socket->bytesToWrite() > blockSize || in.atEnd()) {return ;}QString nextFortune;in >> nextFortune;if (nextFortune == currentFortune) {QTimer::singleShot(0, this, &Client::requestNewFortune);return ;}currentFortune = nextFortune;statusLabel->setText(currentFortune);getFortuneButton->setEnabled(true);
}void Client::displayError(QLocalSocket::LocalSocketError socketError)
{switch (socketError) {case QLocalSocket::ServerNotFoundError:QMessageBox::information(this, tr("Local Fortune Client"),tr("The host was not found, Please make sure that the server is running and that the server name is correct."));break;case QLocalSocket::ConnectionRefusedError:QMessageBox::information(this, tr("Local Fortune Client"),tr("The connection was refused by peer, Make sure the fortune server is running, and check that the server name is correct."));break;case QLocalSocket::PeerClosedError:break;default:QMessageBox::information(this, tr("Local Fortune Client"),tr("The following error occurred: %1.").arg(socket->errorString()));break;}getFortuneButton->setEnabled(true);
}void Client::enableGetFortuneButton()
{getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty());
}
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