QNetworkInterface * test = new QNetworkInterface();
qDebug() << test->allAddresses();
但编译时提示：
'QNetworkConfigurationManager' was not declared in this scope
解决方法：
修改 .pro 文件 增加网络选项
将
QT += core gui
改为：
QT += core gui network
参考链接：http://www.developer.nokia.com/Community/Discussion/showthread.php?222836-QNetworkConfigurationManager-was-not-declared-in-this-scope
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