javascript - blob filereader output appears to be empty (data:;base64,/9j/4AAAAAA...) -


have built websocket server in c , can send/receive text ok, have changed opcode binary (130) , trying send small image (574 bytes). client side binary type set "blob".

ws.binarytype = "blob";

javascript client;

function onmessage(evt) {   if(evt.data instanceof blob){              console.log(evt.data.size);//574 bytes     var reader = new filereader();     var img = document.queryselector("#img_test");      reader.onload = function(e) {       img.src = reader.result;       console.log(img.src);     }      reader.readasdataurl(evt.data);   }   else{     $("#txt_window").append(evt.data+'<br/>');     }      }

the output file reader is; (data:;base64,/9j/4aaaaaa etc... etc... lots of a's).

the size of evt.data matches file sent server (574 bytes) reader.result doesn't appear have content (hence a's). know doing wrong?


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