Qt实现简单的TCP网络电子词典（带界面，能并发）

来源：互联网发布：软件自学网站大全编辑：程序博客网时间：2024/05/29 18:23

服务器代码：

#include "dialog.h"

Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
tcpServer=new QTcpServer(this);
tcpServer->listen(QHostAddress::Any,6677);
connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newClient()));
QSqlDatabase db=QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("my.db");
db.open();
}

Dialog::~Dialog()
{

}

void Dialog::newClient()
{
nextBlockSize=0;
QTcpSocket *tcpSocket=tcpServer->nextPendingConnection();
connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readClient()));
connect(tcpSocket,SIGNAL(disconnected()),tcpSocket,SLOT(deleteLater()));
}

void Dialog::readClient()
{
QTcpSocket *tcpSocket=qobject_cast<QTcpSocket*>(sender());
QDataStream in(tcpSocket);
if(nextBlockSize==0) {
if(tcpSocket->bytesAvailable() < sizeof(quint16))
return;
in >> nextBlockSize;
}
if(tcpSocket->bytesAvailable() < nextBlockSize)
return;
quint8 type;
QString username,password,word;
in >> type;
if(type!='Q') {
in >> username >> password;
processLogin(tcpSocket,type,username,password);
}else {
in >> word;
processFind(tcpSocket,word);
}
tcpSocket->close();
}

void Dialog::processLogin(QTcpSocket *tcpSocket, quint8 type, QString &username, QString password)
{
QByteArray buf;
QDataStream out(&buf,QIODevice::WriteOnly);
out << quint16(0) << quint8(type);
QSqlQuery query("select * from users");
QString user,pass;
if(type=='L') {
while(query.next()) {
user=query.value(0).toString();
pass=query.value(1).toString();
if((user == username) && (pass == password)) {
out << QString("OK");
out.device()->seek(0);
tcpSocket->write(buf);
return;
}
}
out << QString("Failed");
out.device()->seek(0);
tcpSocket->write(buf);
}
else if(type=='R') {
while(query.next()) {
user=query.value(0).toString();
if(user == username) {
out << QString("Failed");
out.device()->seek(0);
out << quint16(buf.size()-sizeof(quint16));
tcpSocket->write(buf);
return;
}
}
query.exec(QString("insert into users values(\"%1\",\"%2\")").arg(username).arg(password));

out << QString("OK");
out.device()->seek(0);
out << quint16(buf.size()-sizeof(quint16));
tcpSocket->write(buf);
}
}

void Dialog::processFind(QTcpSocket *tcpSocket, QString &word)
{
QByteArray buf;
QDataStream out(&buf,QIODevice::WriteOnly);
out << quint16(0) << quint8('R');

QFile file("dict.txt");
if(!file.open(QIODevice::ReadOnly|QIODevice::Text)) {
qDebug() << "open dict.txt failed";
return;
}
QString line;
QTextStream in(&file);
while(!in.atEnd()) {
line=in.readLine();
if(line.startsWith(word)) {
word=line.mid(word.length());
word=word.trimmed();
out << word;
out.device()->seek(0);
out << quint16(buf.size()-sizeof(quint16));
tcpSocket->write(buf);
return;
}
}
word="<font color=red>word not found<font>";
out << word;
out.device()->seek(0);
out << quint16(buf.size()-sizeof(quint16));
tcpSocket->write(buf);
return;
}

===============================================================================================================================

#include "logindialog.h"
#include "ui_logindialog.h"

LoginDialog::LoginDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::LoginDialog)
{
ui->setupUi(this);
tcpSocket=new QTcpSocket(this);
connect(tcpSocket,SIGNAL(connected()),this,SLOT(sendRequest()));
connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readResponse()));
}

LoginDialog::~LoginDialog()
{
delete ui;
}

void LoginDialog::on_buttonBox_accepted()
{
nextBlockSize=0;
tcpSocket->connectToHost("127.0.0.1",6677);
}

void LoginDialog::readResponse()
{
QDataStream in(tcpSocket);
if(nextBlockSize==0) {
if(tcpSocket->bytesAvailable() < sizeof(quint16))
return;
in >> nextBlockSize;
}
if(tcpSocket->bytesAvailable() < nextBlockSize)
return;
quint8 type;
QString str;
in >> type >> str;
tcpSocket->close();
if(type=='R' && str=="OK") {
QMessageBox::information(this,"success","register OK");
}else if(type=='R') {
QMessageBox::warning(this,"error","register failed");
}
if(type=='L' && str=="OK") {
FindDialog *dialog=new FindDialog;
dialog->show();
hide();
}else if(type=='L') {
QMessageBox::warning(this,"error","login error");
}
}

void LoginDialog::sendRequest()
{
QByteArray buf;
QDataStream out(&buf,QIODevice::WriteOnly);
out << quint16(0);
if(ui->radioButton->isChecked())
out << quint8('L');
else
out << quint8('R');
out << ui->lineEdit->text() << ui->lineEdit_2->text();
out.device()->seek(0);
out << quint16(buf.size()-sizeof(quint16));
tcpSocket->write(buf);
}

=================================================================================================================================

#include "finddialog.h"
#include "ui_finddialog.h"

FindDialog::FindDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::FindDialog)
{
ui->setupUi(this);
tcpSocket=new QTcpSocket(this);
connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readResponse()));
connect(tcpSocket,SIGNAL(connected()),this,SLOT(sendRequest()));
}

FindDialog::~FindDialog()
{
delete ui;
}

void FindDialog::on_pushButton_clicked()
{
tcpSocket->connectToHost("127.0.0.1",6677);
nextBlockSize=0;
}

void FindDialog::sendRequest()
{
QByteArray buf;
QDataStream out(&buf,QIODevice::WriteOnly);
out << quint16(0) << quint8('Q') << ui->lineEdit->text();
out.device()->seek(0);
out << quint16(buf.size()-sizeof(quint16));
tcpSocket->write(buf);
}

void FindDialog::readResponse()
{
QDataStream in(tcpSocket);
if(nextBlockSize==0) {
if(tcpSocket->bytesAvailable() < sizeof(quint16))
return;
in >> nextBlockSize;
}
if(tcpSocket->bytesAvailable() < nextBlockSize)
return;
quint8 type;
QString str;
in >> type >> str;
if(type=='R')
ui->textBrowser->setText(str);
tcpSocket->close();
}

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