qt中域名解析的方法

本文博客链接:http://blog.youkuaiyun.com/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"