Qt网络获取外网的网络信息

来源：互联网发布：绿色破解版软件编辑：程序博客网时间：2024/05/18 02:08

如何获取外网IP，一般操作系统不自带这样的命令，需要通过特殊的网页获取，通过打开网页，获取所有源代码，然后分割字符串，取出对应字符串处的本机外网IP地址即可。至于检测是否通外网，很多人首先想到的是检测ping命令，然后看结果，这个方法速度比较慢，我想的方法就是直接用tcp连接百度的IP地址的80端口，如果100毫秒之内可以连上说明通外网。

具体代码如下：

mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {

class MainWindow;

class MainWindow : public QMainWindow

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    bool IPLive(QString ip, int port);

    QString GetHtml(QString url);

    QString GetNetIP(QString webCode);

    QString GetAttribution(QString webCode);

public slots:

    void on_btnGetLocalIP_clicked();

    void on_btnGetWebIP_clicked();

    void on_btnGetAttribution_clicked();

    void on_btnCheckWeb_clicked();

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QDebug>

#include <QTcpSocket>

#include <QNetworkAccessManager>

#include <QNetworkRequest>

#include <QNetworkReply>

#include <QNetworkInterface>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

    ui->setupUi(this);

MainWindow::~MainWindow()

    delete ui;

//判断IP地址及端口是否在线

bool MainWindow::IPLive(QString ip, int port)

    QTcpSocket tcpClient;

    tcpClient.abort();

    tcpClient.connectToHost(ip, port);

    //100毫秒没有连接上则判断不在线

    return tcpClient.waitForConnected(100);

//获取网页所有源代码

QString MainWindow::GetHtml(QString url)

    QNetworkAccessManager *manager = new QNetworkAccessManager();

    QNetworkReply *reply = manager->get(QNetworkRequest(QUrl(url)));

    QByteArray responseData;

    QEventLoop eventLoop;

    QObject::connect(manager, SIGNAL(finished(QNetworkReply *)), &eventLoop, SLOT(quit()));

    eventLoop.exec();

    responseData = reply->readAll();

    return QString(responseData);

//获取本机公网IP地址

QString MainWindow::GetNetIP(QString webCode)

    QString ip = "";

    QString web = webCode.replace(" ", "");

    web = web.replace("\r", "");

    web = web.replace("\n", "");

    QStringList list = web.split("<br/>");

    if(list.count() >= 3)

        ip = list[3];

        list = ip.split("=");

        if(list.count() == 2)

            ip = list[1];

        else

            ip = "";

    return ip;

//获取外网的归属地

QString MainWindow::GetAttribution(QString webCode)

    QString attribution = "";

    QString web = webCode.replace(" ", "");

    web = web.replace("\r", "");

    web = web.replace("\n", "");

    web = web.replace("\t", "");

    QStringList list = web.split("</form>");

    if(list.count() > 0)

        attribution = list[0];

        list = attribution.split("<p>");

        attribution = list.last();

        list = attribution.split("</p>");

        attribution = list[0];

    return attribution;

void MainWindow::on_btnGetLocalIP_clicked()

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

    QList<QHostAddress> list = QNetworkInterface::allAddresses();

    foreach (QHostAddress address, list)

       //我们使用IPv4地址

       if(address.protocol() == QAbstractSocket::IPv4Protocol)

           ui->txtLocalIP->setText(address.toString());

           break;

void MainWindow::on_btnGetWebIP_clicked()

    ui->txtWebIP->setText(GetNetIP(GetHtml("http://whois.pconline.com.cn/")));

void MainWindow::on_btnGetAttribution_clicked()

     ui->txtAttribution->setText(GetAttribution(GetHtml("http://whois.pconline.com.cn/")));

void MainWindow::on_btnCheckWeb_clicked()

    //能接通百度IP说明可以通外网

    bool ok=IPLive("202.108.22.5", 80);

    ui->txtCheckWeb->setText(ok?"true":"false");

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