isConnected method Null safety

Future<bool> isConnected(
  1. PrinterDevice device
)

判断打印机是否已连接 device 打印机设备

Implementation

Future<bool> isConnected(PrinterDevice device) async {
  var connectedDevices = await getConnectedPrinters(type: device.type);
  var first =
      connectedDevices?.firstWhere((e) => e.identify() == device.identify());
  return first != null;
}