[英]How to convert buffer to stream in Nodejs
我遇到了一個關於在 Nodejs 中將緩沖區轉換為流的問題。代碼如下:
var fs = require('fs');
var b = Buffer([80,80,80,80]);
var readStream = fs.createReadStream({path:b});
代碼引發異常:
TypeError: path must be a string or Buffer
但是 Nodejs 的文檔說 fs.createReadStream() 可以接受 Buffer。
fs.createReadStream(路徑[,選項])
路徑 <字符串> | <緩沖區> | <網址>
選項 <字符串> | <對象>
有人可以回答這個問題嗎? 非常感謝!
NodeJS 8+ 版本。 將緩沖區轉換為流
const { Readable } = require('stream');
/**
* @param binary Buffer
* returns readableInstanceStream Readable
*/
function bufferToStream(binary) {
const readableInstanceStream = new Readable({
read() {
this.push(binary);
this.push(null);
}
});
return readableInstanceStream;
}
節點 0.10 +
將緩沖區轉換為流
var Readable = require('stream').Readable;
function bufferToStream(buffer) {
var stream = new Readable();
stream.push(buffer);
stream.push(null);
return stream;
}
const { Readable } = require('stream');
class BufferStream extends Readable {
constructor ( buffer ){
super();
this.buffer = buffer;
}
_read (){
this.push( this.buffer );
this.push( null );
}
}
function bufferToStream( buffer ) {
return new BufferStream( buffer );
}
var {Readable} = require('stream').Readable;
function bufferToStream(buffer) {
var stream = new Readable();
stream.push(buffer);
stream.push(null);
return stream;
}
我用功能風格重寫了 Alex Dykyi 的解決方案:
var Readable = require('stream').Readable;
[file_buffer, null].reduce(
(stream, data) => stream.push(data) && stream,
new Readable()
)
我遇到了在Node.js中將緩沖區轉換為流的問題,代碼如下:
var fs = require('fs');
var b = Buffer([80,80,80,80]);
var readStream = fs.createReadStream({path:b});
該代碼引發異常:
TypeError: path must be a string or Buffer
但是,Nodejs的文檔說fs.createReadStream()可以接受Buffer。
fs.createReadStream(path [,options])
路徑<string> | <緩沖區> | <URL>
選項<string> | <對象>
有人可以回答這個問題嗎? 非常感謝!
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