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50
51#include <QtWidgets>
52#include <QtNetwork>
53
54#include "client.h"
55
56//! [0]
57Client::Client(QWidget *parent)
58 : QDialog(parent)
59 , hostCombo(new QComboBox)
60 , portLineEdit(new QLineEdit)
61 , getFortuneButton(new QPushButton(tr(s: "Get Fortune")))
62 , tcpSocket(new QTcpSocket(this))
63{
64 setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
65//! [0]
66 hostCombo->setEditable(true);
67 // find out name of this machine
68 QString name = QHostInfo::localHostName();
69 if (!name.isEmpty()) {
70 hostCombo->addItem(atext: name);
71 QString domain = QHostInfo::localDomainName();
72 if (!domain.isEmpty())
73 hostCombo->addItem(atext: name + QChar('.') + domain);
74 }
75 if (name != QLatin1String("localhost"))
76 hostCombo->addItem(atext: QString("localhost"));
77 // find out IP addresses of this machine
78 QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
79 // add non-localhost addresses
80 for (int i = 0; i < ipAddressesList.size(); ++i) {
81 if (!ipAddressesList.at(i).isLoopback())
82 hostCombo->addItem(atext: ipAddressesList.at(i).toString());
83 }
84 // add localhost addresses
85 for (int i = 0; i < ipAddressesList.size(); ++i) {
86 if (ipAddressesList.at(i).isLoopback())
87 hostCombo->addItem(atext: ipAddressesList.at(i).toString());
88 }
89
90 portLineEdit->setValidator(new QIntValidator(1, 65535, this));
91
92 auto hostLabel = new QLabel(tr(s: "&Server name:"));
93 hostLabel->setBuddy(hostCombo);
94 auto portLabel = new QLabel(tr(s: "S&erver port:"));
95 portLabel->setBuddy(portLineEdit);
96
97 statusLabel = new QLabel(tr(s: "This examples requires that you run the "
98 "Fortune Server example as well."));
99
100 getFortuneButton->setDefault(true);
101 getFortuneButton->setEnabled(false);
102
103 auto quitButton = new QPushButton(tr(s: "Quit"));
104
105 auto buttonBox = new QDialogButtonBox;
106 buttonBox->addButton(button: getFortuneButton, role: QDialogButtonBox::ActionRole);
107 buttonBox->addButton(button: quitButton, role: QDialogButtonBox::RejectRole);
108
109//! [1]
110 in.setDevice(tcpSocket);
111 in.setVersion(QDataStream::Qt_4_0);
112//! [1]
113
114 connect(sender: hostCombo, signal: &QComboBox::editTextChanged,
115 receiver: this, slot: &Client::enableGetFortuneButton);
116 connect(sender: portLineEdit, signal: &QLineEdit::textChanged,
117 receiver: this, slot: &Client::enableGetFortuneButton);
118 connect(sender: getFortuneButton, signal: &QAbstractButton::clicked,
119 receiver: this, slot: &Client::requestNewFortune);
120 connect(sender: quitButton, signal: &QAbstractButton::clicked, receiver: this, slot: &QWidget::close);
121//! [2] //! [3]
122 connect(sender: tcpSocket, signal: &QIODevice::readyRead, receiver: this, slot: &Client::readFortune);
123//! [2] //! [4]
124 connect(sender: tcpSocket, signal: &QAbstractSocket::errorOccurred,
125//! [3]
126 receiver: this, slot: &Client::displayError);
127//! [4]
128
129 QGridLayout *mainLayout = nullptr;
130 if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) {
131 auto outerVerticalLayout = new QVBoxLayout(this);
132 outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
133 auto outerHorizontalLayout = new QHBoxLayout;
134 outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored));
135 auto groupBox = new QGroupBox(QGuiApplication::applicationDisplayName());
136 mainLayout = new QGridLayout(groupBox);
137 outerHorizontalLayout->addWidget(groupBox);
138 outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored));
139 outerVerticalLayout->addLayout(layout: outerHorizontalLayout);
140 outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
141 } else {
142 mainLayout = new QGridLayout(this);
143 }
144 mainLayout->addWidget(hostLabel, row: 0, column: 0);
145 mainLayout->addWidget(hostCombo, row: 0, column: 1);
146 mainLayout->addWidget(portLabel, row: 1, column: 0);
147 mainLayout->addWidget(portLineEdit, row: 1, column: 1);
148 mainLayout->addWidget(statusLabel, row: 2, column: 0, rowSpan: 1, columnSpan: 2);
149 mainLayout->addWidget(buttonBox, row: 3, column: 0, rowSpan: 1, columnSpan: 2);
150
151 setWindowTitle(QGuiApplication::applicationDisplayName());
152 portLineEdit->setFocus();
153//! [5]
154}
155//! [5]
156
157//! [6]
158void Client::requestNewFortune()
159{
160 getFortuneButton->setEnabled(false);
161 tcpSocket->abort();
162//! [7]
163 tcpSocket->connectToHost(hostName: hostCombo->currentText(),
164 port: portLineEdit->text().toInt());
165//! [7]
166}
167//! [6]
168
169//! [8]
170void Client::readFortune()
171{
172 in.startTransaction();
173
174 QString nextFortune;
175 in >> nextFortune;
176
177 if (!in.commitTransaction())
178 return;
179
180 if (nextFortune == currentFortune) {
181 QTimer::singleShot(interval: 0, receiver: this, slot: &Client::requestNewFortune);
182 return;
183 }
184
185 currentFortune = nextFortune;
186 statusLabel->setText(currentFortune);
187 getFortuneButton->setEnabled(true);
188}
189//! [8]
190
191//! [13]
192void Client::displayError(QAbstractSocket::SocketError socketError)
193{
194 switch (socketError) {
195 case QAbstractSocket::RemoteHostClosedError:
196 break;
197 case QAbstractSocket::HostNotFoundError:
198 QMessageBox::information(parent: this, title: tr(s: "Fortune Client"),
199 text: tr(s: "The host was not found. Please check the "
200 "host name and port settings."));
201 break;
202 case QAbstractSocket::ConnectionRefusedError:
203 QMessageBox::information(parent: this, title: tr(s: "Fortune Client"),
204 text: tr(s: "The connection was refused by the peer. "
205 "Make sure the fortune server is running, "
206 "and check that the host name and port "
207 "settings are correct."));
208 break;
209 default:
210 QMessageBox::information(parent: this, title: tr(s: "Fortune Client"),
211 text: tr(s: "The following error occurred: %1.")
212 .arg(a: tcpSocket->errorString()));
213 }
214
215 getFortuneButton->setEnabled(true);
216}
217//! [13]
218
219void Client::enableGetFortuneButton()
220{
221 getFortuneButton->setEnabled(!hostCombo->currentText().isEmpty() &&
222 !portLineEdit->text().isEmpty());
223
224}
225

source code of qtbase/examples/network/fortuneclient/client.cpp