Qt 读写windows注册表

Qt读取注册表
#define RUN_KEY "HKEY_LOCAL_MACHINE\\SOFTWARE\\Test" 
QSettings reg(RUN_KEY, QSettings::Registry32Format);
         if (reg.contains("key"))
         {
             QVariant vanriantData = reg.value("key"); //读取注册表值
             m_nCount = vanriantData.toInt();
         }
         else
         {
             reg.setValue("key", 1); //设置注册表值
         }