login.cpp

局域网聊天室

#include <QHostAddress>
#include <QMessageBox>
#include <QTextCodec>
#include <QGraphicsView>
#include "login.h"
#include "enrol.h"

Login::Login(QWidget *parent):QDialog(parent)
{
	setupUi(this);
	tcpSocket = new QTcpSocket(this);
	QTextCodec *chineseCodec=QTextCodec::codecForName("UTF_8");
	QTextCodec::setCodecForCStrings(chineseCodec);
	connect(loginButton,SIGNAL(clicked()),this,SLOT(sendMsg()));
	connect(enrolButton,SIGNAL(clicked()),this,SLOT(enrol()));
	connect(eixtButton,SIGNAL(clicked()),this,SLOT(close()));
	connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(recvMsg()));
	connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(error()));

	tcpSocket->connectToHost("192.168.0.7",8000);
}
/*analyze usrname and password whether or not legal*/
int Login::check()
{
	/*to decide usrname*/
	QString str = usrnameEdit->text();
	int n = str.size();
	int i = 0;
	if((n < 5) || (n > 16))
		return 0;
	while(str.data()[i] != '\0'){
		if(((str.data()[i] >= '0')&&(str.data()[i] <= '9')) || 
		   ((str.data()[i] >= 'A')&&(str.data()[i] <= 'Z')) ||
		   ((str.data()[i] >= 'a')&&(str.data()[i] <= 'z')))
			i++;

		else
			return 0;
	}
	/*to decide password*/
	QString str1 = passwordEdit->text();
	int m = str1.size();
	int j = 0;
	if((m < 5) || (m > 16))
		return 0;
	while(str1.data()[j] != '\0'){
		if(((str1.data()[j] >= '0')&&(str1.data()[j] <= '9')) || 
		   ((str1.data()[j] >= 'A')&&(str1.data()[j] <= 'Z')) ||
		   ((str1.data()[j] >= 'a')&&(str1.data()[j] <= 'z')))
			j++;
		else
			return 0;
	}
	return 1;
}
/*skip enrol window*/
void Login::enrol()
{
//	if(erl)
//		delete erl;
	erl = new Enrol();
	erl->show();
}
/*send login message*/
void Login::sendMsg()
{
	int n = check();
	if(n){
		QTextStream out(tcpSocket);
		QString login_message;
		login_message += "Login";
		login_message += " ";
		login_message += usrnameEdit->text();
		login_message += " ";
		login_message += passwordEdit->text();
		login_message += "\n";
		login_message += '\0';
		out<<login_message<<endl;
	}
	else{
		QTextCodec *chineseCodec=QTextCodec::codecForName("UTF_8");
		QTextCodec::setCodecForCStrings(chineseCodec);
		QMessageBox::critical(this,"对不起","用户帐号或用户密码不正确！");
		usrnameEdit->clear();
		passwordEdit->clear();
	}
}
/*recv login message*/
void Login::recvMsg()
{
	if(!tcpSocket->canReadLine())
		return;
	QString responseLine;
	responseLine = tcpSocket->readLine();
	msgBuffer = responseLine;
	if(msgBuffer=="OK@\n"){
//		QMessageBox::information(this,"恭喜","登录成功！")
		
		disconnect(tcpSocket,SIGNAL(readyRead()),this,SLOT(recvMsg()));
		dia = new Dialog(tcpSocket,usrnameEdit->text());/*success skip chat window*/
		dia->show();
		close();
	}
	if(msgBuffer=="FAIL@\n"){
		QMessageBox::critical(this,"错误信息！","登录失败！");
		msgBuffer.clear();
		usrnameEdit->clear();
		passwordEdit->clear();
	}
	if(msgBuffer=="ONLINE@\n"){
		QMessageBox::critical(this,"错误信息！","此用户已登录！");
		msgBuffer.clear();
		usrnameEdit->clear();
		passwordEdit->clear();
	}
}
void Login::error()
{
	QTextCodec *chineseCodec=QTextCodec::codecForName("UTF_8");
	QTextCodec::setCodecForCStrings(chineseCodec);
	QMessageBox::critical(this,"socket error","网络连接失败");
	tcpSocket->close();
	close();
}