Node.js zlib.createDeflateRaw()用法及代码示例

zlib.createDeflateRaw()方法是Zlib模块的内置应用程序编程接口，用于创建新的DeflateRaw对象。

用法:

zlib.createDeflateRaw( options )

参数：此方法接受单个参数选项，这是一个包含zlib选项的可选参数。

返回值：它返回一个新的DeflateRaw对象。

以下示例说明了Node.js中zlib.createDeflateRaw()方法的使用：

范例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!

范例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)

在此，配管未按正确的顺序进行，因此会引发错误。

参考： https://nodejs.org/api/zlib.html#zlib_zlib_createdeflateraw_options

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注：本文由纯净天空筛选整理自nidhi1352singh大神的英文原创作品 Node.js | zlib.createDeflateRaw() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。