Get File Extention from Base64 String

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Hi All,

I wanted to get File type (File Extension) from Base64String in ASP.NET

I have web method in which I have passed 1) Base64 string and 2) File Name with File Extension
but now I wanted to Pass 1) Base64 String and 2) Only File Name (Without Extension)

So Can I get that Extension from that Base64 String / how can i get that base64 Encoded File's Extension.

Thanks.

Posted 16-Jul-13 21:03pm

GauravThorat

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OriginalGriff · Answer 1 · 2013-07-16T21:07:00

Solution 1

Unless the extension is contained within the data converted to base64, then no, you probably can't.
It may be possible to look at the data and decide if it is one of a small range of types, but that will depend on the types that you are checking for, and their individual data formats.

There is no generic data section which says "this binary data is xxx type" (that is what the file extension is there for)

Posted 16-Jul-13 21:07pm

OriginalGriff

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GauravThorat 17-Jul-13 3:19am

I have Converted that data from .NET

I am using below line for covering file to base64,
can i get file extension using this code:

string base64str = System.Convert.ToBase64String(ArrFile,0,ArrFile.Length)

Thanks

OriginalGriff 17-Jul-13 3:56am

No.
Unless you have added the info to your data in the ArrFile array, then you do not convert it to base64, so you cannot recover it.

GauravThorat 17-Jul-13 4:29am

Actually I am getting the Base64 string from iPhone and after processing the videos and images are working but only my question is how can i get the file extension from base64 string.

OriginalGriff 17-Jul-13 4:42am

You can't.

Unless the info is in the string (and your code shows no sign of that) then you have discarded the info and cannot get it back.

Get File Extention from Base64 String

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Get File Extention from Base64 String

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