通过 POS 系统在收据上打印我们的图像时出错

Question

下面是我的代码。

 Future<List<int>> getImage() async {
    List<int> bytes = [];
    CapabilityProfile profile = await CapabilityProfile.load();
    final generator = Generator(PaperSize.mm80, profile);

    final ByteData data = await rootBundle.load('assets/logo.png');
    final buffer = data.buffer;
    final image = base64.encode(Uint8List.view(buffer));
    bytes += generator.image(image);

    return bytes;
  }

在

bytes += generator.image(image); 

错误提示

错误：不能将参数类型“字符串”分配给参数类型“图像”。

Answer 1

来自The docs

你需要传递字节而不是 base64

您好像错过了decodeImage()

Future<List<int>> getImage() async {
    List<int> bytes = [];
    CapabilityProfile profile = await CapabilityProfile.load();
    final generator = Generator(PaperSize.mm80, profile);

    final ByteData data = await rootBundle.load('assets/logo.png');
    final Uint8List buffer = data.buffer.asUint8List();
    final Image image = decodeImage(buffer);

    bytes += generator.image(image);

    return bytes;
  }