Qt通用方法及类库11

函数名

    //判断IP地址及端口是否在线
    static bool ipLive(const QString &ip, int port, int timeout = 1000);
    //获取网页所有源代码
    static QString getHtml(const QString &url);
    //获取本机公网IP地址
    static QString getNetIP(const QString &webCode);
    //获取本机IP
    static QString getLocalIP();
    //Url地址转为IP地址
    static QString urlToIP(const QString &url);

    //字符串补全
    static QString getValue(quint8 value);
    //判断是否通外网
    static bool isWebOk();

函数体

bool QUIHelper::ipLive(const QString &ip, int port, int timeout)
{
    //局部的事件循环,不卡主界面
    QEventLoop eventLoop;

    //设置超时
    QTimer timer;
    connect(&timer, SIGNAL(timeout()), &eventLoop, SLOT(quit()));
    timer.setSingleShot(true);
    timer.start(timeout);

    QTcpSocket tcpSocket;
    connect(&tcpSocket, SIGNAL(connected()), &eventLoop, SLOT(quit()));
    tcpSocket.connectToHost(ip, port);
    eventLoop.exec();
    bool ok = (tcpSocket.state() == QAbstractSocket::ConnectedState);
    return ok;
}

QString QUIHelper::getHtml(const 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);
}

QString QUIHelper::getNetIP(const QString &webCode)
{
    QString web = webCode;
    web = web.replace(' ', "");
    web = web.replace("\r", "");
    web = web.replace("\n", "");
    QStringList list = web.split("<br/>");
    QString tar = list.at(3);
    QStringList ip = tar.split("=");
    return ip.at(1);
}

QString QUIHelper::getLocalIP()
{
    QStringList ips;
    QList<QHostAddress> addrs = QNetworkInterface::allAddresses();
    foreach (QHostAddress addr, addrs) {
        QString ip = addr.toString();
        if (QUIHelper::isIP(ip)) {
            ips << ip;
        }
    }

    //优先取192开头的IP,如果获取不到IP则取127.0.0.1
    QString ip = "127.0.0.1";
    foreach (QString str, ips) {
        if (str.startsWith("192.168.1") || str.startsWith("192")) {
            ip = str;
            break;
        }
    }

    return ip;
}

QString QUIHelper::urlToIP(const QString &url)
{
    QHostInfo host = QHostInfo::fromName(url);
    return host.addresses().at(0).toString();
}

QString QUIHelper::getValue(quint8 value)
{
    QString result = QString::number(value);
    if (result.length() <= 1) {
        result = QString("0%1").arg(result);
    }
    return result;
}

bool QUIHelper::isWebOk()
{
    //能接通百度IP说明可以通外网
    return ipLive("115.239.211.112", 80);
}