How do I send image files (binary data) using socket.io?… here is a solution to the problem.
How do I send image files (binary data) using socket.io?
I can’t send data from Android Client
to NodeJS Server
.
I use Socket.IO-client Java library in my client.
However, there is not much information for me.
How do I send binary data from an android client to a nodejs server?
Solution
You can encode images using Base64:
public void sendImage(String path)
{
JSONObject sendData = new JSONObject();
try{
sendData.put("image", encodeImage(path));
socket.emit("message",sendData);
}catch(JSONException e){
}
}
private String encodeImage(String path)
{
File imagefile = new File(path);
FileInputStream fis = null;
try{
fis = new FileInputStream(imagefile);
}catch(FileNotFoundException e){
e.printStackTrace();
}
Bitmap bm = BitmapFactory.decodeStream(fis);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG,100,baos);
byte[] b = baos.toByteArray();
String encImage = Base64.encodeToString(b, Base64.DEFAULT);
Base64.de
return encImage;
}
So basically you’re sending a string to node.js
If you want to receive images, just decode them in Base64:
private Bitmap decodeImage(String data)
{
byte[] b = Base64.decode(data,Base64.DEFAULT);
Bitmap bmp = BitmapFactory.decodeByteArray(b,0,b.length);
return bmp;
}