QT 网络编程之TCP/IP连接超时-求解决

enaldick 2013-03-10 01:13:58

qt tcp/ip 服务端正常监听，但客户端连接超时是怎么回事？服务端是linux rehl6,防火墙关了的，可以上网的！客户端是windows



//widget.cpp服务端

#include "widget.h"

#include "ui_widget.h"

#include <QtGui>

#include <stdio.h>

#include <QSqlDatabase>



Widget::Widget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget)

{

    ui->setupUi(this);

    this->setWindowTitle("Server");

    this->server = new QTcpServer(this);

    this->tcpsocket = new QTcpSocket(this);

    //sql_con();//SQL databas init.SQL连接配置

    port=new QString();

    port->clear();

    ip="172.16.113.22";//121.8.242.229-服务器IP

    port->append("6666");//要监听的端口

    i=1;

    if(!server->listen(QHostAddress(ip),(quint16)port->toInt(0,10))){

        //printf("please input your PC IP\n");//to apply the IP that you will listen's IP

        //QString cip;

        //scanf("&s:",&cip);

        //if(!server->listen(QHostAddress(cip),(quint16)port->toInt(0,10))){

        QMessageBox box;//修改为qdebug-----S

        box.setText("listen error");//-----

        box.exec();//修改为qdebug-----E

        close();

       // }

    }else{

        connect(this->server, SIGNAL(newConnection()), this, SLOT(acceptConnection()));

        connect(this->ui->replyPushButton, SIGNAL(clicked()), this, SLOT(clickReplyButton()));

        connect(this->server, SIGNAL(newConnection()), this, SLOT(autosend()));//autosend.自动发送内容

    }

}



Widget::~Widget()

{

    delete ui;

}

void Widget::sql_con()//SQL database init.

{

    QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL");

    db.setHostName("127.0.0.1");

    db.setUserName("root");

    db.setPassword("weiqun");

    db.setDatabaseName("zigbee");

}



void Widget::clickReplyButton()//The button to send message.发送消息按钮

{

    //this->tcpsocket = this->server->nextPendingConnection();

    connect(this->server, SIGNAL(newConnection()), this, SLOT(sendToClient()));

}



void Widget::acceptConnection()//when connect success to do.连接成功后所作操作

{

    this->tcpsocket = this->server->nextPendingConnection();

    connect(this->tcpsocket, SIGNAL(readyRead()), this, SLOT(readFormClient()));

}



void Widget::readFormClient()//receive message.接收消息

{

    QString str;

    str = this->tcpsocket->readAll();

    this->ui->fromTextEdit->append(str);

}



void Widget::sendToClient()//send message.发送消息

{

    QString sss="Sending message to client...";

    sss.append(this->ui->toTextEdit->toPlainText());

    if(sss != "")

    {

        string str2 = string(sss.toAscii().data());

        const char *str3 = str2.c_str();

        this->tcpsocket->write(str3);

    }

    this->ui->toTextEdit->clear();

}



void Widget::autosend(){//自动发送信息至客户端

    QString si=QString::number(i);

    QString sss= "Sending message to client:number.";//要发送的内容

    sss.append(si);

    sss.append("--:");

    string str2 = string(sss.toAscii().data());

    const char *str3 = str2.c_str();

    this->tcpsocket->write(str3);

    i++;

}



//服务端头文件widget.h

#ifndef WIDGET_H

#define WIDGET_H



#include <QWidget>

#include <QtNetwork>

#include <QString>

using namespace std;



namespace Ui {

    class Widget;

}



class Widget : public QWidget

{

    Q_OBJECT



public:

    explicit Widget(QWidget *parent = 0);

    ~Widget();



private:

    Ui::Widget *ui;



    QTcpServer *server;

    QTcpSocket *tcpsocket;

    QString readFormClientMessage;

    quint16 blockSize;

    QString ip;

    QString *port;

    int i;



private slots:

    void clickReplyButton();

    void readFormClient();

    void sendToClient();

    void acceptConnection();

    void autosend();

    void sql_con();

};



#endif // WIDGET_H



//客户端widget.cpp

#include "widget.h"

#include "ui_widget.h"

#include <QMessageBox>



Widget::Widget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget)

{

    ui->setupUi(this);



    this->setWindowTitle("Client");



    this->client = new QTcpSocket(this);



    connect(this->ui->requestPushButton, SIGNAL(clicked()), this, SLOT(clickRequestButton()));

    connect(this->client, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError)));

    connect(this->client, SIGNAL(readyRead()), this, SLOT(readFormServer()));

}



Widget::~Widget()

{

    delete ui;

}



void Widget::clickRequestButton()

{

    sendToServer();

    if(!ui->errorLabel->text().isEmpty())

    ui->errorLabel->setText("");

}



void Widget::sendToServer()

{

    this->client->abort();

    QString ip ="121.8.242.229";// "172.16.113.22";

    int port = 6666;



    this->client->connectToHost(ip, port);



    QString str = this->ui->toTextEdit->toPlainText();

    if(str != "")

    {

        string str2 = string(str.toAscii().data());

        const char *str3 = str2.c_str();



        this->client->write(str3);

    }

}



void Widget::readFormServer()

{

    //this->ui->fromTextEdit->clear();

    QString str5;

    str5 = this->client->readAll();

    this->ui->fromTextEdit->append(str5);

}



void Widget::displayError(QAbstractSocket::SocketError)

{

    this->ui->errorLabel->setText(this->client->errorString());

}



//客户端头文件widget.h

#ifndef WIDGET_H

#define WIDGET_H



#include <QWidget>

#include <QtNetwork>

#include <QString>

using namespace std;



namespace Ui {

    class Widget;

}



class Widget : public QWidget

{

    Q_OBJECT



public:

    explicit Widget(QWidget *parent = 0);

    ~Widget();



private:

    Ui::Widget *ui;



    QTcpSocket *client;

    QString readFormServerMessage;

    quint16 blockSize;



private slots:

    void clickRequestButton();

    void sendToServer();

    void readFormServer();

    void displayError(QAbstractSocket::SocketError);

};



#endif // WIDGET_H