How do I read a 16-bit int from a Uint8List in Dart?

Question

I have a binary data stored in Uint8List and I'd like to read a 16-bit int from that list. Are there any convenience methods to help with this?

(paraphrasing from a conversation I had with a colleague)

Answer 1

You can use the ByteData class:

var buffer = new Uint8List(8).buffer;
var bytes = new ByteData.view(buffer);
bytes.getUint16(offset);

(paraphrased from an answer provided by a colleague)

Answer 2

正如Seth所说，你想要一个Uint8List二进制数据的ByteData视图。

使用ByteBuffer.asByteData()稍微好一些。 它更简洁，更适合测试。 如果你有一个模拟Uint8List和一个模拟ByteBuffer，new ByteData.view(buffer)将失败，但模拟ByteBuffer的asByteData()方法可以返回一个模拟ByteData。

var bytes = myUint8List.buffer.asByteData();
bytes.getUint16(offset);

凭借完美的远见，我们只有asByteData（）而不是冗余的公共ByteData.view构造函数。