網上的Base64解碼器

I have an email backup file which is purely text. How can I retrieve the document (PDF, IMAGES, WORD FILE) attached to it as a normal file?

I'm trying to decode a file, which is mostly encoded with base64. What I want to do is to decode the following, while still maintaining the [_*_].

example.txt

wq9cXyjjg4QpXy/Crwo=[_NOTBASE64ED_]aGkgdGhlcmUK[_CONSTANT_]SGVsbG8gV29ybGQhCg==

Sometimes it'll be in this form

aGkgdGhlcmUK[_CONSTANT_]SGVsbG8gV29ybGQhCg==

Desired output

¯\_(ツ)_/¯[_NOTBASE64ED_]hi there[_CONSTANT_]Hello World!hi there[_CONSTANT_]Hello World!

Error output

¯\_(ツ)_/¯4��!:�@�H\�B�8ԓ��[��ܛBbase64: invalid input

What I've tried

base64 -di example.txtbase64 -d example.txtbase64 --wrap=0 -d -i example.txt

I tried to individually base64 the [_*_] using grep -o. Then find and
replacing them through a weird arrangement with arrays, but I couldn't
get it to work. base64ing it all, then decoding. Results in double base64ed rows.

The file is significantly downsized!Encoded using base64 --wrap=0, while loop, and if/else statement.The [_*_] still need to be there after being decoded.

I am saving some child nodes as Base64. This is to make passing a group of elements (nodes) around easier, ultimately saving the base64 string to a database and hopefully reading this back into the original HTML elements (nodes)

I am using atob() and btoa() https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding

I am unable to re-use this base64 as I don't know how. I know how to convert it back into HTML.

In my application, when the user saves (clicks a button), it saves an HTML element (and children) using btoa and I get the 'funny' looking string.

Now, I need to reload this from the string into something HTML understand to display it in the GUI.

I use atob(myString) and I get an HTMLDivElement

I don't know how to use this. This means the following fails

My effort is (and this probably won't work in IE which is fine)

  const wrapperEle = document.getElementById("wrapper");  const destinationEle = document.getElementById("destination");  const btn = document.getElementById("button");  btn.addEventListener("click", performLogic);  function performLogic() {      destinationEle.innerHTML = null;      const myString = btoa(wrapperEle); //encode      const data = atob(myString);       //decode        try {            const node = document.createElement(data);            destination.appendChild(node);        } catch (e){            alert("Failed on first effort");        }        try {            destination.append(data); //appends [object HTMLDivElement]            alert("second attempt complete");        } catch  (e){            alert("Failed on second effort");        }        try {            destination = data; //appends [object HTMLDivELement]            alert("third attempt complete but nothing shows");        } catch  (e){            alert("Failed on third effort");        }        try {            destination.append(myString); //appends [object HTMLDivELement]            alert("fourth attempt complete but nothing shows");        } catch  (e){            alert("Failed on fourth effort");        }    }

<div id="wrapper"><table><tr>  <td>data 01</td>  <td>data 02</td></tr></table></div><input type="button" id="button" value="Click" /><div id="destination">I want and expect this line of text to be replaced with the table content above after you click on the button</div>

How do I recomsume the value that has been encoded and decoded? Ideally, with no JQuery or any framework, just Javascript

I've added JS as well but it won't work in IE (which is fine).

https://jsfiddle.net/uLb8okrs/2/

I am trying to decode data in an xml format into bytes (base64) and I am having issues. I wrote a program in java that takes a String data and converts it into bytes like this:

String data = "......"; //string of data in xml formatbyte[] dataBytes = Base64.getDecoder().decode(data);

This fails and give me and exception like this:

java.lang.IllegalArgumentException: Illegal base64 character 3c    at java.util.Base64$Decoder.decode0(Base64.java:714)    at java.util.Base64$Decoder.decode(Base64.java:526)    at java.util.Base64$Decoder.decode(Base64.java:549)    at XmlReader.main(XmlReader.java:61)

Is the xml format not compatible with base64? It seems as though the issue might be caused with the angle brackets '<>'

I can able to fetch attachment by passing userId, nessageID and attachmentID(For reference:

Google Developer

Cocoa Docs

I'm getting response as like below.

{ "data": "JVBERi0xLjYKJeTjz9IKMSAwIG9iagpbL1BERi9JbWFnZUIvSW1hZ2VDL0l...." "size": 629163}

I want to decode data to save in my app local and later i will display .

I can successfully downloaded and saved in local(document folder) but not able to see the content in the attachment please make me perfect.