Qt使用tcp实现的简单服务端和客户端(带心跳检测)

/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include <QtWidgets> #include <QtNetwork> #include <QCryptographicHash> #include "client.h" #include "mymessagedef.h" //! [0] Client::Client(QWidget *parent) : QDialog(parent) , hostCombo(new QComboBox) , portLineEdit(new QLineEdit) , messageEdit(new QLineEdit) , getFortuneButton(new QPushButton(tr("发送消息测试"))) , tcpSocket(new QTcpSocket(this)) , networkSession(Q_NULLPTR) { setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); //! [0] hostCombo->setEditable(true); // find out name of this machine QString name = QHostInfo::localHostName(); if (!name.isEmpty()) { hostCombo->addItem(name); QString domain = QHostInfo::localDomainName(); if (!domain.isEmpty()) hostCombo->addItem(name + QChar('.') + domain); } if (name != QLatin1String("localhost")) hostCombo->addItem(QString("localhost")); // find out IP addresses of this machine QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses(); // add non-localhost addresses for (int i = 0; i < ipAddressesList.size(); ++i) { if (!ipAddressesList.at(i).isLoopback()) hostCombo->addItem(ipAddressesList.at(i).toString()); } // add localhost addresses for (int i = 0; i < ipAddressesList.size(); ++i) { if (ipAddressesList.at(i).isLoopback()) hostCombo->addItem(ipAddressesList.at(i).toString()); } portLineEdit->setValidator(new QIntValidator(1, 65535, this)); QLabel *hostLabel = new QLabel(tr("&服务器名:")); hostLabel->setBuddy(hostCombo); QLabel *portLabel = new QLabel(tr("服务器端口:")); portLabel->setBuddy(portLineEdit); QLabel *messageLabel = new QLabel(tr("消息:")); messageLabel->setBuddy(messageEdit); statusLabel = new QLabel(tr("选择服务器，端口，向其发送消息。")); getFortuneButton->setDefault(true); getFortuneButton->setEnabled(false); QPushButton *quitButton = new QPushButton(tr("退出")); QDialogButtonBox *buttonBox = new QDialogButtonBox; buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); //! [1] in.setDevice(tcpSocket); in.setVersion(QDataStream::Qt_4_0); //! [1] connect(hostCombo, &QComboBox::editTextChanged, this, &Client::enableGetFortuneButton); connect(messageEdit, &QLineEdit::textChanged, this, &Client::enableGetFortuneButton); connect(portLineEdit, &QLineEdit::textChanged, this, &Client::enableGetFortuneButton); connect(getFortuneButton, &QAbstractButton::clicked, this, &Client::requestNewFortune); connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close); //! [2] //! [3] connect(getFortuneButton, &QAbstractButton::clicked, this, &Client::sendMessageHeader); connect(tcpSocket, &QTcpSocket::bytesWritten, this, &Client::sendMessage); connect(tcpSocket, &QIODevice::readyRead, this, &Client::readFortune); //! [2] //! [4] connect(tcpSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), //! [3] this, &Client::displayError); //! [4] QGridLayout *mainLayout = Q_NULLPTR; if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) { QVBoxLayout *outerVerticalLayout = new QVBoxLayout(this); outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); QHBoxLayout *outerHorizontalLayout = new QHBoxLayout; outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); QGroupBox *groupBox = new QGroupBox(QGuiApplication::applicationDisplayName()); mainLayout = new QGridLayout(groupBox); outerHorizontalLayout->addWidget(groupBox); outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); outerVerticalLayout->addLayout(outerHorizontalLayout); outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); } else { mainLayout = new QGridLayout(this); } mainLayout->addWidget(hostLabel, 0, 0); mainLayout->addWidget(hostCombo, 0, 1); mainLayout->addWidget(portLabel, 1, 0); mainLayout->addWidget(portLineEdit, 1, 1); mainLayout->addWidget(messageLabel, 2, 0); mainLayout->addWidget(messageEdit, 2, 1); mainLayout->addWidget(statusLabel, 3, 0, 1, 2); mainLayout->addWidget(buttonBox, 4, 0, 1, 2); setWindowTitle(QGuiApplication::applicationDisplayName()); portLineEdit->setFocus(); QNetworkConfigurationManager manager; if (manager.capabilities() & QNetworkConfigurationManager::NetworkSessionRequired) { // Get saved network configuration QSettings settings(QSettings::UserScope, QLatin1String("QtProject")); settings.beginGroup(QLatin1String("QtNetwork")); const QString id = settings.value(QLatin1String("DefaultNetworkConfiguration")).toString(); settings.endGroup(); // If the saved network configuration is not currently discovered use the system default QNetworkConfiguration config = manager.configurati