Qt网络获取外网的网络信息

       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
4000
<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");

}