nextFile
Returns information for the next file in the enumerated object. Will block until the information is available. The #GFileInfo returned from this function will contain attributes that match the attribute string that was passed when the #GFileEnumerator was created.
See the documentation of #GFileEnumerator for information about the order of returned files.
On error, returns null and sets @error to the error. If the enumerator is at the end, null will be returned and @error will be unset.
Return
A #GFileInfo or null on error or end of enumerator. Free the returned object with g_object_unref() when no longer needed.
Parameters
cancellable
optional #GCancellable object, null to ignore.