Node.js Buffer.readInt32LE()方法
原文:https://www . geesforgeks . org/node-js-buffer-readint 32 le-method/
Buffer.readInt32LE()方法用于从给定偏移量的缓冲区对象中读取 32 位整数,并以小端字节顺序返回结果。
语法:
buffer.readInt32LE( offset )
参数:该方法接受单个参数偏移,指定缓冲对象的位置。它表示开始读取前要跳过的字节数。偏移值介于 0 到 buff . length–4之间。默认值为 0。
返回值:该方法在小端字节序中指定的偏移量处读取一个带符号的 32 位整数。
例 1:
// Node.js program to demonstrate the
// buffer.readInt32LE() method
const buff = Buffer.from([1, 2, 3, 4, 5]);
console.log(buff.readInt32LE(0));
console.log(buff.readInt32LE(1));
输出:
67305985
84148994
例 2:
// Node.js program to demonstrate the
// bufferobj.readInt32LE() method
const buff = Buffer.from([1, 2, 3, 4, 5]);
console.log(buff.readInt32LE(4))
输出:
buffer.js:831
throw new RangeError('Index out of range');
^
RangeError: Index out of range
at checkOffset (buffer.js:831:11)
at Buffer.readInt32LE (buffer.js:984:5)
at Object. (/home/cg/root/8545664/main.js:8:18)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:389:7)
上面的示例显示了错误,因为它的参数不在有效范围内。
注意:
- To get the value in small format, you can use the buffer.readint32be () method .
- The above programs are compiled and run with the
node index.js
command.
参考:T2【https://nodejs . org/API/buffer . html # buffer _ buf _ readint 32 le _ offset
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