Node.js Buffer.writeInt16LE()方法
原文:https://www . geesforgeks . org/node-js-buffer-writeint16le-method/
Buffer.writeInt16LE()方法是 Buffer 模块中类 Buffer 的内置应用编程接口，用于以指定的小端格式将有效的带符号 16 位整数写入指定偏移量处的缓冲区。
语法:
Buffer.writeInt16LE( value, offset )
参数:该方法接受两个参数，如上所述，如下所述:
- Value: A valid signed 16-bit integer to be written into the buffer.
- Offset: indicates the number of bytes to skip before writing to the buffer. The offset value is in the range of 0 < = offset < = buf.length–2 . The default value of offset for is 0.
返回值:以小端格式返回一个在指定偏移量插入值的缓冲区。
下面的例子说明了 Buffer.writeInt16LE() 方法在 Node.js 中的使用:
例 1:
// Node.js program to demonstrate the
// Buffer.writeInt16LE() method
// Creating a buffer
const buf = Buffer.allocUnsafe(10);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x0114, 0);
// Display the buffer
console.log(buf);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x1015, 2);
// Display the buffer
console.log(buf);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x0016, 8);
// Display the buffer
console.log(buf);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x0217, 6);
// Display the buffer
console.log(buf);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x0518, 4);
// Display the result
console.log(buf);
输出:
<Buffer 14 01 9b 02 00 00 00 00 a8 79>
<Buffer 14 01 15 10 00 00 00 00 a8 79>
<Buffer 14 01 15 10 00 00 00 00 16 00>
<Buffer 14 01 15 10 00 00 17 02 16 00>
<Buffer 14 01 15 10 18 05 17 02 16 00>
例 2:
// Node.js program to demonstrate the
// Buffer.writeInt16LE() method
// Creating a buffer
const buf = Buffer.allocUnsafe(6);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x2211, 0);
// Display the buffer
console.log(buf);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x4433, 2);
// Display the buffer
console.log(buf);
// Using Buffer.writeInt16LE() method
buf.writeInt16LE(0x6655, 4);
// Display the buffer
console.log(buf);
输出:
<Buffer 11 22 00 00 00 00>
<Buffer 11 22 33 44 00 00>
<Buffer 11 22 33 44 55 66>
注意:以上程序使用node index.js命令编译运行。
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