The asynchronous version of gio.data_input_stream.DataInputStream.readLine. It is an error to have two outstanding calls to this function.
When the operation is finished, callback will be called. You can then call gio.data_input_stream.DataInputStream.readLineFinish to get the result of the operation.
the [I/O priority][io-priority] of the request
optional #GCancellable object, null to ignore.
callback to call when the request is satisfied.
The asynchronous version of gio.data_input_stream.DataInputStream.readLine. It is an error to have two outstanding calls to this function.
When the operation is finished, callback will be called. You can then call gio.data_input_stream.DataInputStream.readLineFinish to get the result of the operation.