Node.js Buffer.writeInt32LE()方法
原文:https://www . geesforgeks . org/node-js-buffer-writeint32 le-method/
Buffer.writeInt32LE()方法用于使用小端格式将指定的字节写入缓冲区。该值包含有效的带符号 32 位整数。如果该值包含其他带符号的 32 位整数，则它的行为是未定义的。
语法:
Buffer.writeInt32LE( value, offset )
参数:该方法接受两个参数，如上所述，如下所述:
- Value: It is an integer value that represents the value written into the buffer.
- Offset: is an integer value, indicating the number of bytes to skip before writing, and the offset value is in the range of 0 to buffer.length–4 . Its default value is 0.
返回值:返回偏移量加上写入的字节数。
例 1:
// Node.js program to demonstrate the
// Buffer.writeInt32LE() Method
// Allocate a buffer
const buf = Buffer.allocUnsafe(8);
// Write the buffer element in LE format
buf.writeInt32LE(0x05060708, 0);
// Display the buffer list
console.log(buf);
// Write the buffer element in LE format
buf.writeInt32LE(0x05060708, 4);
// Display the buffer list
console.log(buf);
输出:
<Buffer 08 07 06 05 00 00 00 00>
<Buffer 08 07 06 05 08 07 06 05>
例 2:
// Node.js program to demonstrate the
// Buffer.writeInt32LE() Method
// Allocate a buffer
const buf = Buffer.allocUnsafe(8);
// Write the buffer element in LE format
buf.writeInt32LE(0x12345678, 0);
// Display the buffer list
console.log(buf);
// Write the buffer element in LE format
buf.writeInt32LE(0x123456, 4);
// Display the buffer list
console.log(buf);
输出:
<Buffer 78 56 34 12 63 65 73 73>
<Buffer 78 56 34 12 56 34 12 00>
注意:以上程序使用node index.js命令编译运行。
参考:T2【https://nodejs . org/API/buffer . html # buff _ writeint32 le _ value _ offset
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