C++/Qt/QTcpSocket — различия между версиями
Admin (обсуждение | вклад) м (1 версия: Импорт контента...) |
Admin (обсуждение | вклад) м (1 версия: Импорт контента...) |
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Текущая версия на 13:25, 25 мая 2010
QTcpSocket based client
<source lang="cpp">
- ifndef CLIENT_H
- define CLIENT_H
- include <QDialog>
- include <QTcpSocket>
QT_BEGIN_NAMESPACE class QDialogButtonBox; class QLabel; class QLineEdit; class QPushButton; class QTcpSocket; QT_END_NAMESPACE class Client : public QDialog {
Q_OBJECT
public:
Client(QWidget *parent = 0);
private slots:
void requestNewFortune(); void readFortune(); void displayError(QAbstractSocket::SocketError socketError); void enableGetFortuneButton();
private:
QLabel *hostLabel; QLabel *portLabel; QLineEdit *hostLineEdit; QLineEdit *portLineEdit; QLabel *statusLabel; QPushButton *getFortuneButton; QPushButton *quitButton; QDialogButtonBox *buttonBox; QTcpSocket *tcpSocket; QString currentFortune; quint16 blockSize;
};
- endif
- include <QtGui>
- include <QtNetwork>
- include "client.h"
Client::Client(QWidget *parent): QDialog(parent) {
hostLabel = new QLabel(tr("&Server name:")); portLabel = new QLabel(tr("S&erver port:")); hostLineEdit = new QLineEdit("Localhost"); portLineEdit = new QLineEdit; portLineEdit->setValidator(new QIntValidator(1, 65535, this)); hostLabel->setBuddy(hostLineEdit); portLabel->setBuddy(portLineEdit); statusLabel = new QLabel(tr("This examples requires that you run the " "Fortune Server example as well.")); getFortuneButton = new QPushButton(tr("Get Fortune")); getFortuneButton->setDefault(true); getFortuneButton->setEnabled(false); quitButton = new QPushButton(tr("Quit")); buttonBox = new QDialogButtonBox; buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
tcpSocket = new QTcpSocket(this); connect(hostLineEdit, SIGNAL(textChanged(const QString &)),this, SLOT(enableGetFortuneButton())); connect(portLineEdit, SIGNAL(textChanged(const QString &)),this, SLOT(enableGetFortuneButton())); connect(getFortuneButton, SIGNAL(clicked()),this, SLOT(requestNewFortune())); connect(quitButton, SIGNAL(clicked()), this, SLOT(close())); connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune())); connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),this, SLOT(displayError(QAbstractSocket::SocketError))); QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(hostLabel, 0, 0); mainLayout->addWidget(hostLineEdit, 0, 1); mainLayout->addWidget(portLabel, 1, 0); mainLayout->addWidget(portLineEdit, 1, 1); mainLayout->addWidget(statusLabel, 2, 0, 1, 2); mainLayout->addWidget(buttonBox, 3, 0, 1, 2); setLayout(mainLayout); setWindowTitle(tr("Fortune Client")); portLineEdit->setFocus();
} void Client::requestNewFortune() {
getFortuneButton->setEnabled(false); blockSize = 0; tcpSocket->abort(); tcpSocket->connectToHost(hostLineEdit->text(), portLineEdit->text().toInt());
} void Client::readFortune() {
QDataStream in(tcpSocket); in.setVersion(QDataStream::Qt_4_0); if (blockSize == 0) { if (tcpSocket->bytesAvailable() < (int)sizeof(quint16)) return; in >> blockSize; } if (tcpSocket->bytesAvailable() < blockSize) return; QString nextFortune; in >> nextFortune; if (nextFortune == currentFortune) { QTimer::singleShot(0, this, SLOT(requestNewFortune())); return; } currentFortune = nextFortune; statusLabel->setText(currentFortune); getFortuneButton->setEnabled(true);
} void Client::displayError(QAbstractSocket::SocketError socketError) {
switch (socketError) { case QAbstractSocket::RemoteHostClosedError: break; case QAbstractSocket::HostNotFoundError: QMessageBox::information(this, tr("Fortune Client"), tr("The host was not found. Please check the " "host name and port settings.")); break; case QAbstractSocket::ConnectionRefusedError: QMessageBox::information(this, tr("Fortune Client"), tr("The connection was refused by the peer. " "Make sure the fortune server is running, " "and check that the host name and port " "settings are correct.")); break; default: QMessageBox::information(this, tr("Fortune Client"), tr("The following error occurred: %1.") .arg(tcpSocket->errorString())); } getFortuneButton->setEnabled(true);
} void Client::enableGetFortuneButton(){
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty() && !portLineEdit->text().isEmpty());
}
- include <QApplication>
- include "client.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv); Client client; client.show(); return client.exec();
}
</source>