qt中域名解析的方法

本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.

qt中提供了可以实现域名解析功能的类QHostInfo,这个类解析域名提供两种机制,一种是阻塞式,一种是非阻塞信号槽机制,下面介绍第二种机制的实现方法。


qt的帮助中给出了这个类的例子:

QHostInfo::lookupHost("www.kde.org",this, SLOT(lookedUp(QHostInfo)));

//当解析成功域名后,会调用lookedUp槽函数
void MyWidget::lookedUp(const QHostInfo &host)
 {
     if (host.error() != QHostInfo::NoError) {
         qDebug() << "Lookup failed:" << host.errorString();
         return;
     }

     foreach (QHostAddress address, host.addresses())
         qDebug() << "Found address:" << address.toString();
 }

仿照这个例子,我做了google域名的解析测试:

QHostInfo::lookupHost("www.google.com",this,SLOT(slot_get_ip(QHostInfo)));

void test::slot_get_ip(QHostInfo host_info)
{
    if (host_info.error() != QHostInfo::NoError)
    {
         qDebug() << "Lookup failed:" << host_info.errorString();
         return;
    }

    for (int i = 0;i < host_info.addresses().size();i++)
    {
         qDebug() << "Found address:" << host_info.addresses()[i].toString() << endl;
    }
}

在调试窗口可以看到解析结果:

Found address: "64.233.183.106" 

Found address: "64.233.183.147" 

Found address: "64.233.183.99" 

Found address: "64.233.183.103" 

Found address: "64.233.183.104" 

Found address: "64.233.183.105" 


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