Controlling the connectivity state

Before trying to access a network resource, it's useful to check whether you have an active connection to the internet. Qt allows you to check whether the computer, mobile device, or tablet is online. You can even start a new connection if the operating system supports it.

The relevant API mainly consists of four classes. QNetworkConfigurationManager is the base and starting point. It holds all network configurations available on the system. Furthermore, it provides information about the network capabilities, for example, whether you can start and stop interfaces. The network configurations found by it are stored as QNetworkConfiguration classes.

QNetworkConfiguration holds all information about an access point but not about a network interface, as an interface can provide multiple access points. This class also provides only the information about network configurations. You can't configure an access point or a network interface through QNetworkConfiguration...