GAppInfo
that is registered as the default
application to handle the file specified by file
.gFileQueryDefaultHandler(object, cancellable = NULL, .errwarn = TRUE)
object
GFile
to open.cancellable
GCancellable
object, NULL
to ignore.cancellable
is not NULL
, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error G_IO_ERROR_CANCELLED
will be returned.