node . js zlib . createpincheraw()方法

原文:https://www . geesforgeks . org/node-js-zlib-createpinieraw-method/

方法是 zlib 模块的内置应用编程接口，用于创建一个新的平减对象。

语法:

zlib.createDeflateRaw( options )

参数:该方法接受单参数选项，这是一个保存 zlib 选项的可选参数。

返回值:返回一个新的平减对象。

以下示例说明了在 Node.js 中使用zlib . createpincheraw()方法:

例 1:

// Node.js program to demonstrate the     
// createDeflateRaw() method

// Including zlib and fs module
const zlib = require("zlib");
const fs = require('fs');

// Creating readable Stream
const inp = fs.createReadStream('input.txt');

// Creating writable stream
const out = fs.createWriteStream('input.txt.gz');

// Calling createDeflateRaw method
const defR = zlib.createDeflateRaw();

// Piping
inp.pipe(defR).pipe(out);
console.log("Program Completed!");

输出:

Program Completed!

例 2:

// Node.js program to demonstrate the     
// createDeflateRaw() method

// Including zlib and fs module
const zlib = require("zlib");
const fs = require('fs');

// Creating readable Stream
const inp = fs.createReadStream('input.txt');

// Creating writable stream
const out = fs.createWriteStream('input.txt.gz');

// Calling createDeflateRaw method
const defR = zlib.createDeflateRaw();

// Piping
inp.pipe(out).pipe(defR);
console.log("Program Completed!");

输出:

Error [ERR_STREAM_CANNOT_PIPE]: Cannot pipe, not readable
    at WriteStream.Writable.pipe (_stream_writable.js:243:24)
    at /home/runner/SomberMonumentalCad/index.js:19:15
    at Script.runInContext (vm.js:133:20)
    at Object. (/run_dir/interp.js:156:20)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)

在这里，管道没有按照正确的顺序进行，因此会出现错误。

参考资料:https://nodejs . org/API/zlib . html # zlib _ zlib _ create deflate _ options

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