write method Null safety

  1. @override
Future<bool?> write(
  1. PrinterDevice device,
  2. Uint8List data
)
override

发送数据到打印机 device 打印机设备 data 数据

Implementation

@override
Future<bool?> write(PrinterDevice device, Uint8List data) {
  // TODO: implement write
  throw UnimplementedError();
}