node . js buffer . readbigint 64 le()方法
原文:https://www . geesforgeks . org/node-js-buffer-readbigint 64 le-method/
Buffer.readBigInt64LE()方法用于从给定偏移量的缓冲区对象中读取 64 位大整数，并以小端顺序返回结果。
语法:
buffer.readBigInt64LE( 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:该方法读取小端指定偏移量处的有符号 64 位大整数。
例 1:
文件名:index.js
java 描述语言
// Node.js program to demonstrate the
// buffer.readInt32LE() method
const buff = Buffer.from([0x00, 0x00,
0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);
// Getting big integer value by
// using readBigInt64LE method
const value = buff.readBigInt64LE(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 :- -4294967296
例 2:
文件名:index.js
java 描述语言
// Node.js program to demonstrate the
// buffer.readInt32LE() method
const buff = Buffer.from([0x00, 0x00,
0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);
// Getting big integer value by
// using readBigInt64LE method
const value = buff.readBigInt64LE(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.readBigInt64LE (internal/buffer.js:128:5)
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 le _ offset
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