From String to Base-64 var obj = {a: ‘a’, b: ‘b’}; var encoded = btoa(JSON.stringify(obj)) To decode back to actual var actual = JSON.parse(atob(encoded)) For reference look here. https://developer.mozilla.org/en/docs/Web/API/WindowBase64/Base64_encoding_and_decoding
There’s a simpler way using ‘dart:convert’ package Image.memory(base64Decode(base64String)); Implementation and some useful methods : import ‘dart:convert’; import ‘dart:typed_data’; import ‘package:flutter/widgets.dart’; Image imageFromBase64String(String base64String) { return Image.memory(base64Decode(base64String)); } Uint8List dataFromBase64String(String base64String) { return base64Decode(base64String); } String base64String(Uint8List data) { return base64Encode(data); }
Remember to import base64 and that b64encode takes bytes as an argument. import base64 b = base64.b64encode(bytes(‘your string’, ‘utf-8’)) # bytes base64_str = b.decode(‘utf-8’) # convert bytes to string
If you want to download it using JavaScript (without any back-end) use: window.location.href=”https://stackoverflow.com/questions/14011021/data:application/octet-stream;base64,” + img; where img is your base64 encoded image. If you want to allow the user to specify a file name, use the download attribute of the a tag: <a download=”FILENAME.EXT” href=”data:image/png;base64,asdasd…”>Download</a> Notice: The download attribute is not supported by very old … Read more
var i = new Image(); i.onload = function(){ alert(i.width + “, ” + i.height); }; i.src = imageData;
EDIT As of OS X 10.9 / iOS 7, this is built into the frameworks. See -[NSData base64EncodedDataWithOptions:] Prior to iOS7/OS X 10.9: Matt Gallagher wrote an article on this very topic. At the bottom he gives a link to his embeddable code for iPhone. On the mac you can use the OpenSSL library, on … Read more
What about something like cat /dev/urandom | base64 Which gives (lots of) stuff like hX6VYoTG6n+suzKhPl35rI+Bsef8FwVKDYlzEJ2i5HLKa38SLLrE9bW9jViSR1PJGsDmNOEgWu+6 HdYm9SsRDcvDlZAdMXAiHBmq6BZXnj0w87YbdMnB0e2fyUY6ZkiHw+A0oNWCnJLME9/6vJUGsnPL TEw4YI0fX5ZUvItt0skSSmI5EhaZn09gWEBKRjXVoGCOWVlXbOURkOcbemhsF1pGsRE2WKiOSvsr Xj/5swkAA5csea1TW5mQ1qe7GBls6QBYapkxEMmJxXvatxFWjHVT3lKV0YVR3SI2CxOBePUgWxiL ZkQccl+PGBWmkD7vW62bu1Lkp8edf7R/E653pi+e4WjLkN2wKl1uBbRroFsT71NzNBalvR/ZkFaa 2I04koI49ijYuqNojN5PoutNAVijyJDA9xMn1Z5UTdUB7LNerWiU64fUl+cgCC1g+nU2IOH7MEbv gT0Mr5V+XAeLJUJSkFmxqg75U+mnUkpFF2dJiWivjvnuFO+khdjbVYNMD11n4fCQvN9AywzH23uo 03iOY1uv27ENeBfieFxiRwFfEkPDgTyIL3W6zgL0MEvxetk5kc0EJTlhvin7PwD/BtosN2dlfPvw cjTKbdf43fru+WnFknH4cQq1LzN/foZqp+4FmoLjCvda21+Ckediz5mOhl0Gzuof8AuDFvReF5OU Or, without the (useless) cat+pipe : base64 /dev/urandom (Same kind of output ^^ ) EDIT : you can also user the –wrap option of base64, to avoid having “short lines” : base64 … Read more
The cause is probably adblock extension (I had exactly the same problem).
Two years late, but here we go: The short answer is yes, unique binary/hex values will always encode to a unique base64 encoded string. BUT, multiple base64 encoded strings may represent a single binary/hex value. This is because hex bytes are not aligned with base64 ‘digits’. A single hex byte is represented by 8 bits … Read more
Gmail Web Client does support embedded images See my answer to Base64 images to gmail