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分享关于QTcpSocket的问题
//client.h
#ifndef CLIENT_H
#define CLIENT_H
#include <QDialog>
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QLineEdit;
class QPushButton;
class QTcpSocket;
class QTextEdit;
QT_END_NAMESPACE
//! [0]
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;
QTextEdit *textEdit;
QPushButton *getFortuneButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QTcpSocket *tcpSocket;
QString currentFortune;
quint16 blockSize;
#ifdef Q_OS_SYMBIAN
bool isDefaultIapSet;
#endif
};
//! [0]
#endif
//client.cpp
#include <QtGui>
#include <QtNetwork>
#include "client.h"
#ifdef Q_OS_SYMBIAN
#include "sym_iap_util.h"
#endif
//! [0]
Client::Client(QWidget *parent)
: QDialog(parent)
{
//! [0]
hostLabel = new QLabel(tr("&Server name:"));
portLabel = new QLabel(tr("S&erver port:"));
// find out which IP to connect to
QString ipAddress;
QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
// use the first non-localhost IPv4 address
for (int i = 0; i < ipAddressesList.size(); ++i) {
if (ipAddressesList.at(i) != QHostAddress::LocalHost &&
ipAddressesList.at(i).toIPv4Address()) {
ipAddress = ipAddressesList.at(i).toString();
break;
}
}
// if we did not find one, use IPv4 localhost
if (ipAddress.isEmpty())
ipAddress = QHostAddress(QHostAddress::LocalHost).toString();
hostLineEdit = new QLineEdit(ipAddress);
portLineEdit = new QLineEdit;
portLineEdit->setValidator(new QIntValidator(1, 65535, this));
hostLabel->setBuddy(hostLineEdit);
portLabel->setBuddy(portLineEdit);
textEdit = new QTextEdit;
textEdit->setReadOnly(true);
textEdit->append("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);
//! [1]
tcpSocket = new QTcpSocket(this);
//! [1]
connect(hostLineEdit, SIGNAL(textChanged(QString)),
this, SLOT(enableGetFortuneButton()));
connect(portLineEdit, SIGNAL(textChanged(QString)),
this, SLOT(enableGetFortuneButton()));
connect(getFortuneButton, SIGNAL(clicked()),
this, SLOT(requestNewFortune()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
//! [2] //! [3]
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune()));
//! [2] //! [4]
connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),
//! [3]
this, SLOT(displayError(QAbstractSocket::SocketError)));
//! [4]
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(textEdit, 2, 0, 3, 2);
mainLayout->addWidget(buttonBox, 5, 0, 1, 2);
setLayout(mainLayout);
setWindowTitle(tr("Fortune Client"));
portLineEdit->setFocus();
}
//主要是这个函数改了
void Client::requestNewFortune()
{
getFortuneButton->setEnabled(false);
for(int i=0;i<5;i++)
{
blockSize = 0;
tcpSocket->abort();
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
}
}
//! [6]
//! [8]
void Client::readFortune()
{
//! [9]
QDataStream in(tcpSocket);
in.setVersion(QDataStream::Qt_4_0);
if (blockSize == 0) {
if (tcpSocket->bytesAvailable() < (int)sizeof(quint16))
return;
//! [8]
//! [10]
in >> blockSize;
}
if (tcpSocket->bytesAvailable() < blockSize)
return;
//! [10] //! [11]
QString nextFortune;
in >> nextFortune;
if (nextFortune == currentFortune) {
QTimer::singleShot(0, this, SLOT(requestNewFortune()));
return;
}
//! [11]
//! [12]
currentFortune = nextFortune;
//! [9]
textEdit->append(currentFortune);
getFortuneButton->setEnabled(true);
}
//! [12]
//! [13]
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);
}
//! [13]
void Client::enableGetFortuneButton()
{
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
&& !portLineEdit->text().isEmpty());
}
//main.cpp
#include <QApplication>
#include "client.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Client client;
#ifdef Q_OS_SYMBIAN
// Make application better looking and more usable on small screen
client.showMaximized();
#else
client.show();
#endif
return client.exec();
}
这个程序是由QT自带例子fortune client改编之成的，服务器是QT的自带例子fortune server
程序的功能是在我按下发送按钮的时候，向服务器连续发送5个请求，
但客户端只能收到一条信息（本来应该收到5条信息的），这是为什么呢？
应该怎样改正？
PS：祝大家新年快乐！
...全文
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AAA20090987 2011-02-11
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[Quote=引用 4 楼 yangglemu 的回复:]
关键是你那个For循环里有问题,要注意网络流往返的速度可赶不上for循环的速度:
for(int i=0;i<5;i++)
{
blockSize = 0;
tcpSocket->abort();//tcpSocket未完成任务就重置连接了
tcpSocket->connectToHost(hostLineEdit->text(),
portLi……
[/Quote]
解决了，谢谢你啊
我当时也在郁闷，怎么QT的网络库都是非阻塞的呢？呵呵
你已经帮过我很多次了，再次谢谢你。
关键是你那个For循环里有问题,要注意网络流往返的速度可赶不上for循环的速度:
for(int i=0;i<5;i++)
{
blockSize = 0;
tcpSocket->abort();//tcpSocket未完成任务就重置连接了
tcpSocket->connectToHost(hostLineEdit->text(),
portLi……
[/Quote]
解决了，谢谢你啊
我当时也在郁闷，怎么QT的网络库都是非阻塞的呢？呵呵
你已经帮过我很多次了，再次谢谢你。
人到中年琐事多 2011-02-08
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关键是你那个For循环里有问题,要注意网络流往返的速度可赶不上for循环的速度:
for(int i=0;i<5;i++)
{
blockSize = 0;
tcpSocket->abort();//tcpSocket未完成任务就重置连接了
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
tcpSocket->waitForReadyRead(1000);//阻塞一下就行了(等待tcpSocket从服务器获取数据)
}
for(int i=0;i<5;i++)
{
blockSize = 0;
tcpSocket->abort();//tcpSocket未完成任务就重置连接了
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
tcpSocket->waitForReadyRead(1000);//阻塞一下就行了(等待tcpSocket从服务器获取数据)
}
AAA20090987 2011-02-07
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[Quote=引用 1 楼 heksn 的回复:]
检查一下服务端是否收到5个请求
[/Quote]
我调试了一下，服务器的确收到了5个请求
检查一下服务端是否收到5个请求
[/Quote]
我调试了一下，服务器的确收到了5个请求
AAA20090987 2011-02-07
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这是服务器端的代码：
//server.h
#ifndef SERVER_H
#define SERVER_H
#include <QDialog>
QT_BEGIN_NAMESPACE
class QLabel;
class QPushButton;
class QTcpServer;
QT_END_NAMESPACE
//! [0]
class Server : public QDialog
{
Q_OBJECT
public:
Server(QWidget *parent = 0);
private slots:
void sendFortune();
private:
QLabel *statusLabel;
QPushButton *quitButton;
QTcpServer *tcpServer;
QStringList fortunes;
};
//! [0]
#endif
//server.cpp
#include <QtGui>
#include <QtNetwork>
#include "fserver.h"
Server::Server(QWidget *parent)
: QDialog(parent)
{
statusLabel = new QLabel;
quitButton = new QPushButton(tr("Quit"));
quitButton->setAutoDefault(false);
tcpServer = new QTcpServer(this);
if (!tcpServer->listen()) {
QMessageBox::critical(this, tr("Fortune Server"),
tr("Unable to start the server: %1.")
.arg(tcpServer->errorString()));
close();
return;
}
//! [0]
QString ipAddress;
QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
// use the first non-localhost IPv4 address
for (int i = 0; i < ipAddressesList.size(); ++i) {
if (ipAddressesList.at(i) != QHostAddress::LocalHost &&
ipAddressesList.at(i).toIPv4Address()) {
ipAddress = ipAddressesList.at(i).toString();
break;
}
}
// if we did not find one, use IPv4 localhost
if (ipAddress.isEmpty())
ipAddress = QHostAddress(QHostAddress::LocalHost).toString();
statusLabel->setText(tr("The server is running on\n\nIP: %1\nport: %2\n\n"
"Run the Fortune Client example now.")
.arg(ipAddress).arg(tcpServer->serverPort()));
//! [1]
//! [2]
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.");
//! [2]
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
//! [3]
connect(tcpServer, SIGNAL(newConnection()), this, SLOT(sendFortune()));
//! [3]
QHBoxLayout *buttonLayout = new QHBoxLayout;
buttonLayout->addStretch(1);
buttonLayout->addWidget(quitButton);
buttonLayout->addStretch(1);
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(statusLabel);
mainLayout->addLayout(buttonLayout);
setLayout(mainLayout);
setWindowTitle(tr("Fortune Server"));
}
//! [4]
void Server::sendFortune()
{
//! [5]
QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_0);
out << (quint16)0;
out << fortunes.at(qrand() % fortunes.size());
out.device()->seek(0);
out << (quint16)(block.size() - sizeof(quint16));
QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
connect(clientConnection, SIGNAL(disconnected()),
clientConnection, SLOT(deleteLater()));
//! [7] //! [8]
clientConnection->write(block);
clientConnection->disconnectFromHost();
//! [5]
}
//! [8]
//main.cpp
#include <QApplication>
#include <QtCore>
#include "fserver.h"
#ifdef Q_OS_SYMBIAN
#include "sym_iap_util.h"
#endif
int main(int argc, char *argv[])
{
#ifdef Q_OS_SYMBIAN
qt_SetDefaultIap();
#endif
QApplication app(argc, argv);
Server server;
#ifdef Q_OS_SYMBIAN
server.showMaximized();
#else
server.show();
#endif
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
return server.exec();
}
写不动代码的人 2011-02-07
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检查一下服务端是否收到5个请求
