網上的Base64解碼器

I was looking into my Mail Server in Text version; There is saw an attachment of filename= xyz.xslx & Content-Transfer-Encoding: base-64 and after that there was stream of Base64 encoded Code. Initially the content-type was Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;

Now, Is it possible to convert the base-64 encoded string code to retrieve the xslx document? I tried using several online sites like base64decode.org but as the initial file type was xslx, it didn't gave any output in Plain-Text too. So how do i work out with issue ?

Can someone please explain why decoding Base64 giving a broken pdf?I need to find the way how to decode Base64 and get pdf out.When i use this service

https://emn178.github.io/online-tools/base64_decode_file.html

I am able to pass Base64 and get file out without problem.

But when i do same in node.js I am getting empty (broken) file consistently.I tried different packages like:js-base64, atob

and none of them worked, getting same empty file as the result.

Link to my code:https://repl.it/@afiliptsov/FaroffGloriousFormula

I wonder if someone know how to convert the depth map of google street view (encoded as base64) into an image or a 2D matrix. I'm using Python and was able to get the base64 string, decode it and save it to a .png file. However, the exported png file cannot be open by any graphic viewer... I guess the base64 code wasn't decoded correctly...

Here is a post that mentioned the base64 string in GSV.

Here is my code:

#URL of the json file of a GSV depth mapurl_depthmap='http://maps.google.com/cbk?output=json&cb_client=maps_sv&v=4&dm=1&pm=1&ph=1&hl=en&panoid=lcptgwtxfJ6DccSzyWp0zA'# getting the json filer = requests.get(url_depthmap)# open itdepth_json= r.json()# get the base64 string of the depth mapdata=depth_json['model']['depth_map']# fix the 'inccorrect padding' error. The length of the string needs to be divisible by 4.data += "=" * ((4 - len(data) % 4) % 4)# convert the URL safe format to regular format.data=data.replace('-','+').replace('_','/')data = base64.decodestring(data) # decode the stringdata=zlib.decompress(data) #decompress the data# write it to a png fileimage_result = open('downloads/deer_decode.png', 'wb')image_result.write(data)

I have a method that returns an unsigned char * array and I am trying to encode this as base64 and decode it later. So what I am doing is as follows:

unsigned char * val = myMethod();char * encodedMsg = reinterpret_cast<char *>(val);std::cout << "Returned message: " << val << std::endl;QByteArray raw = QByteArray(encodedMsg).toBase64(QByteArray::Base64Encoding | QByteArray::OmitTrailingEquals);

The output from the method is \u0001z\ri!i, and the encoded value is XHUwMDAxelxyaSFpLA.

Now, I decode it as follows:

QByteArray decoded = QByteArray::fromBase64(raw,                            QByteArray::Base64Encoding | QByteArray::OmitTrailingEquals);qDebug() << decoded;

Now this returns \\u0001z\\ri!i,. Notice that the slashes have been escaped.

I know I can replace this as a post processing step but is there a way to avoid this. Perhaps I am using the encoding/decoding incorrectly?

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