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This article will take you through the usage of the Buffer module in Nodejs, and introduce the method of Buffer encoding and decoding binary data packets. I hope it will be helpful to everyone!
Today, we will learn about the use of Nodejs's Buffer module, as well as the currently commonly used buffer npm package. [Recommended study: "nodejs Tutorial"]
First, attach the document address of nodejs buffer: https://nodejs.org/dist/latest-v16.x/docs/api/ buffer.html
There are two commonly used methods to create a buffer:
1, Buffer.alloc(size): Create a buffer of specified length
console.log(Buffer.alloc(20));
Result:
2. Buffer.from(): Create a buffer## from an existing structure #
console.log(Buffer.from("fsfdfafd")); console.log(Buffer.from([1, 2, 3, 4]));Result:
let buffer1 = Buffer.from("fsfdfafd"); console.log(buffer1); buffer1.writeInt8(127, 1); console.log(buffer1);Result:
From the results, we can see that the content at offset 1 has been changed.
offset position is
big endian
let buffer1 = Buffer.from("fsfdfafd"); console.log(buffer1); buffer1.`writeInt16BE`(127, 1); console.log(buffer1);Result:
offset position is
little endian
let buffer1 = Buffer.from("fsfdfafd"); console.log(buffer1); buffer1.`writeInt16LE`(127, 1); console.log(buffer1);Result:
The npm package we want to introduce here about node buffer is
protocol-buffers. This is its npm address: https://www.npmjs.com/package/protocol-buffers
Programming Video! !
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