JavaScript文件API到node.js的方法如何通過websocket發送ArrayBuffer和數據

Question

嗨，我正在嘗試從JavaScript客戶端發送文件並將其上傳到node.js服務器，並且它確實可以正常工作，客戶端：

var ws = new WebSocket("ws://localhost");
ws.binaryType = "arraybuffer";
//file input code, it all works etc...
loader.onload = (e) {
   ws.send(e.target.result); //actually works and sends the arraybuffer
}
loader.readAsArrayBuffer(file/*not quoted here but you get the idea*/)

服務器端並不僅僅只是基本的websocket服務器，它確實會接收arraybuffer（以buffer的形式）。

問題：我還需要同時發送文件名和數據，如何在客戶端的ArrayBuffer中添加文件頭，並在節點中讀取它？

Answer 1

您可以將ArrayBuffer封裝在帶有文件名或元數據的對象中嗎？ 即

var ws = new WebSocket("ws://localhost");
ws.binaryType = "arraybuffer";

// the object to be passed by the socket
var filePayload = {
    fileName:'file.file',
    fileType:'xxx'
    // any othere metadata here
};

//file input code, it all works etc...
loader.onload = (e) => {
    // add the array buffer as a property in the object
    filePayload['data'] = e.target.result;
    ws.send(filePayload); 
}
loader.readAsArrayBuffer(file/*not quoted here but you get the idea*/)