问题
I have a problem to convert binary data to base-64 in JS. I try all the things that exists on the net include this How to parse into base64 string the binary image from response?, but everyone return a wrong base-64 and I don't find why !
**I try this solution Retrieving binary file content using Javascript, base64 encode it and reverse-decode it using Python but the convert to base-64 not work for me! It's return something wrong .
I get a string binary response from server and I want to convert him to base-64 that I can create a file from him and to show him to user. This is the response I get from server to png picture for example:
�PNG
IHDRrP6�tEXtSoftwareAdobe ImageReadyq�e<�IDATx�b���?�#6��g��T=;��� >č�&g��:��A�@���LX��0�A�T >[40f��H��>0`B
#��<��0a�+���b�
�o����o0��~�7��'�xlP����e��.3<x��A�����~�w��$�@90���
`���Ivd�1@c�2���F&�ATM��.�p���[���8��p�]�@,�����pyP��q���pB����u�����3l(6A `@qzK�Q���M�8Q�Ӑ&��1�$(�@� R�81H��P�&P�����ҟ1\��V��3P�d��fp0�#;��ld �yt�(����
J{�М��>>@{!А�3%?@/�
0�O�U,{�9IEND�B`�
Now , I want to take this binary string and to convert him .
For example , the real base 64 of png picture is:
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
When I use any kind of code to convert to base-64 it's return this string :
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
I find this solution for encode to base 64 : https://koding.com/Activity/base64-encoding And now the encode is closer to what need to be but still not help:
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
I try also the soultions here:https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Sending_and_Receiving_Binary_Data without convert to base-64 and with 'arrayBuffer' and 'Blob' objects but the picture didn't show . The only way the picture show it's when I convert to a correct base-64 and then create arraybuffer and initialize Blob with him . But the problem is the same - I cant convert my data to correct base-64.
can anyone save me please ??
Thanks !
回答1:
Here is the link to this small library that is meant can be useful for u. It can convert base64 to binary and vice versa.
回答2:
My problem is solved . I use dropzone plugin to get the response from server and because of this I get binary data as a text reponse and it make my problems. I just go to dropzone.js and change 2 minor things to get the response in type of arraybuffer :
xhr.responseType = 'arraybuffer'; ( line 1246)
This is new line to get the response in type of arrayBuffer, and then create a Blob object from the arraybuffer response .
response = xhr.response; (line 1305 )
Change it to get response inseted TextRrsponse..
I hope that it will help somebody... Thanks everyone !
来源：https://stackoverflow.com/questions/39570364/convert-binary-data-to-base-64-javascript