Qt中域名解析的方法
Qt中域名解析的方法
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:
[cpp]- 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Linuxidc.com域名的解析测试:
[cpp]
- QHostInfo::lookupHost("www.bkjia.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:
[cpp]- 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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