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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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