zlib.createGzip()方法是Zlib模塊的內置應用程序編程接口,用於創建新的Gzip對象。
用法:
zlib.createGzip( options )
參數:此方法接受單個參數選項,該參數是包含zlib選項的可選參數。
返回值:它返回一個新的Gzip對象。
以下示例說明了Node.js中zlib.createGzip()方法的使用:
範例1:
// Node.js program to demonstrate the
// createGzip() 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 createGzip method
const gzip = zlib.createGzip();
// Piping
inp.pipe(gzip).pipe(out);
console.log("Gzip created!");
輸出:
Gzip created!
範例2:
// Node.js program to demonstrate the
// createGzip() 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 createGzip method
const gzip = zlib.createGzip();
// Piping
inp.pipe(out).pipe(gzip);
console.log("Gzip created!");
輸出:
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,配管未按正確的順序進行,因此會引發錯誤。
參考: https://nodejs.org/api/zlib.html#zlib_zlib_creategzip_options
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