javascript - 将 DataView 与 Node.js 缓冲区一起使用

Question

我正在尝试使用 DataView 读取/写入一些二进制数据目的。当缓冲区从 UInt8Array 初始化时，它似乎可以正常工作，但是如果向其传递一个 NodeJS Buffer 对象，结果似乎会关闭。我是否错误地使用了 API？

    import { expect } from 'chai';

    describe('read binary data', () => {

      it('test buffer', () => {
        let arr = Buffer.from([0x55,0xaa,0x55,0xaa,0x60,0x00,0x00,0x00,0xd4,0x03,0x00,0x00,0x1c,0xd0,0xbb,0xd3,0x00,0x00,0x00,0x00])
        let read = new DataView(arr.buffer).getUint32(0, false);
        expect(read).to.eq(0x55aa55aa);
      })

      it('test uint8array', () => {
        let arr = new Uint8Array([0x55,0xaa,0x55,0xaa,0x60,0x00,0x00,0x00,0xd4,0x03,0x00,0x00,0x1c,0xd0,0xbb,0xd3,0x00,0x00,0x00,0x00])
        let read = new DataView(arr.buffer).getUint32(0, false);
        expect(read).to.eq(0x55aa55aa);
      })

    })

带有缓冲区的失败，并显示

AssertionError: expected 1768779887 to equal 1437226410
      + expected - actual

      -1768779887
      +1437226410

Answer 1

尝试使用这个buf.copy

const buf = fs.readFileSync(`...`);
const uint8arr = new Uint8Array(buf.byteLength);

buf.copy(uint8arr, 0, 0, buf.byteLength);
const v = new DataView(uint8arr.buffer);