node . js zlib . bytes written Property
原文:https://www . geesforgeks . org/node-js-zlib-bytes written-property/
zlib . Byteswrited 属性是 zlib 模块的一个应用程序编程接口，用于指定在字节被处理(压缩或解压缩，对于派生类来说是合适的)之前写入引擎的字节数。
语法:
zlib.bytesWritten
返回值:返回写入引擎的字节数。
下面的例子说明了在 Node.js 中使用zlib . bytes writed 方法:
例 1:
// Node.js program to demonstrate the
// zlib.bytesWritten Property
// Including assert and zlib
// module
var zlib = require('zlib');
var assert = require('assert');
// Input to be written
const input = Buffer.from('0123456789012345678901');
// Calling deflate method
zlib.deflate(input, (err, deflatedBuffer) => {
assert(!err);
// Declaring buffer and numberRead
var numberRead = 0;
var buffers = [];
// Creating a zip object
var stream = zlib.createGzip()
// Data event
.on('data', function(chunk) {
buffers.push(chunk);
numberRead += chunk.length;
})
// end event
.on('end', function() {
// Calling bytesWritten property
console.log(stream.bytesWritten);
})
.end(deflatedBuffer);
});
输出:
21
例 2:
// Node.js program to demonstrate the
// zlib.bytesWritten property
// Including zlib module
var zlib = require('zlib');
// Input to be written
const input = Buffer.from('NidhiSingh1352');
// Calling deflateRaw method
zlib.deflateRaw(input, (err, buffer) => {
// Creating a Deflate object
var zlibs = zlib.Deflate()
// Data event
.on('data', function(chunk) {})
// end event
.on('end', function() {
// Calling bytesWritten property
console.log(zlibs.bytesWritten);
})
.end(buffer);
});
输出:
16
参考资料:https://nodejs . org/API/zlib . html # zlib _ zlib _ bytes step
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