Node.js zlib.createDeflate()用法及代碼示例

zlib.createDeflate()方法是Zlib模塊的內置應用程序編程接口，用於創建新的Deflate對象。

用法:

zlib.createDeflate( options )

參數：此方法接受單個參數選項，這是一個包含zlib選項的可選參數。

返回值：它返回一個新的Deflate對象。

以下示例說明了Node.js中zlib.createDeflate()方法的使用：

範例1：

// Node.js program to demonstrate the      
// createDeflate() 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 createDeflate method 
const def = zlib.createDeflate(); 
  
// Piping 
inp.pipe(def).pipe(out); 
console.log("Program Completed!");

輸出：

Program Completed!

範例2：

// Node.js program to demonstrate the      
// createDeflate() 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 createDeflate method 
const def = zlib.createDeflate(); 
  
// Piping 
inp.pipe(out).pipe(def); 
console.log("Program Completed!");

輸出：

Error [ERR_STREAM_CANNOT_PIPE]:Cannot pipe, not readable
    at WriteStream.Writable.pipe (_stream_writable.js:243:24)
    at /home/runner/CorruptFlawedSoftwaresuite/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，配管未按正確的順序進行，因此會引發錯誤。

參考： https://nodejs.org/api/zlib.html#zlib_zlib_createdeflate_options

相關用法

注：本文由純淨天空篩選整理自nidhi1352singh大神的英文原創作品 Node.js | zlib.createDeflate() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。