node . js buffer . readbigint 64 be()方法

原文:https://www . geesforgeks . org/node-js-buffer-readbigint 64 be-method/

Buffer.readBigInt64BE()方法用于在给定偏移量处从缓冲区对象中读取 64 位大整数，并以大端顺序返回结果。 语法:

buffer.readBigInt64BE( 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。偏移值在 0 到缓冲区长度–8的范围内。默认值为 0。 返回值:该方法读取大端指定偏移量处的有符号 64 位大整数。 示例 1: 文件名:index.js

java 描述语言

// Node.js program to demonstrate the
// buffer.readInt32BE() method
const buff = Buffer.from([0x00, 0x00,
    0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);

// Getting big integer value by
// using readBigInt64BE method
const value = buff.readBigInt64BE(0);

// Display the result
console.log("Big Integer :- " + value);

使用以下命令运行 index.js 文件:

node index.js

输出:

Big Integer :- 4294967295

示例 2: 文件名:index.js

java 描述语言

// Node.js program to demonstrate the
// buffer.readInt32BE() method
const buff = Buffer.from([0x00, 0x00
   , 0x01, 0x00, 0xfe, 0xff, 0xff, 0xff]);

// gGtting big integer value by
// using readBigInt64BE method
const value = buff.readBigInt64BE(1);

// Display the result
console.log("Big Integer :- " + value);

使用以下命令运行 index.js 文件:

node index.js

输出:

internal/buffer.js:77
  throw new ERR_OUT_OF_RANGE(type || 'offset',
  ^

RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range. It must be >= 0 
and <= 0\. Received 1
    at boundsError (internal/buffer.js:77:9)
    at Buffer.readBigInt64BE (internal/buffer.js:146:5)
    at Object. (F:\java\GFG.js:7:20)
    at Module._compile (internal/modules/cjs/loader.js:1138:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
    at Module.load (internal/modules/cjs/loader.js:986:32)
    at Function.Module._load (internal/modules/cjs/loader.js:879:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47 {
  code: 'ERR_OUT_OF_RANGE'
}

上面的示例显示了错误，因为它的参数不在有效范围内。 参考:https://nodejs . org/dist/latest-v 12 . x/docs/API/buffer . html # buffer _ buf _ readbigint 64 be _ offset

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