Virtualvfunc_Gets the default application for launching applications using this URI scheme for a particular GioUnix.DesktopAppInfoLookup implementation.
The GioUnix.DesktopAppInfoLookup interface and this function is used to implement Gio.AppInfo.get_default_for_uri_scheme backends in a GIO module. There is no reason for applications to use it directly. Applications should use Gio.AppInfo.get_default_for_uri_scheme.
a string containing a URI scheme.
Interface for implementing DesktopAppInfoLookup. Contains only the virtual methods that need to be implemented.