Processing Binary Protocols with Client-Side JavaScript

http://blog.mgechev.com/2015/02/06/parsing-binary-protocol-data-javascript-typedarrays-blobs/

 

https://github.com/novnc/websockify

ws.binaryType = "blob";
// or
ws.binaryType = "arraybuffer";

var pixels=16,
a=new Uint8Array(pixels*3),
l=pixels*1;
while(l--){
 a[l*3]=255;//red
 a[l*3+1]=0;//green
 a[l*3+2]=0;//blue
}
ws.send(a.buffer);

// 使用ArrayBuffer发送canvas图像数据

 

var img = canvas_context.getImageData(0, 0, 400, 320);

 

var binary = new Uint8Array(img.data.length);

 

for (var i = 0; i < img.data.length; i++) {

 

 binary[i] = img.data[i];

 

}

 

connection.send(binary.buffer);

// 使用Blob发送文件

var file = document.querySelector(‘input[type=”file”]').files[0];

connection.send(file);

 function valueToByteArray(value, bytes_length) { var bytes_array = []; while (bytes_length > 0){ var byte = value & 0xFF; value >>= 8; bytes_length--; bytes_array.push(byte); } return bytes_array.reverse(); }