Byte Array Substring

Question

I am trying to return a substring of a byte array.

(another application is pushing data into my database, where files have a prepended GUID attached to it. I want to remove this GUID, when giving the file back to the user)

if (bytes.Length > 38)
            {
                string s = System.Text.Encoding.ASCII.GetString(bytes);
                returnBytes = Convert.FromBase64String(s.Substring(38));
            }

Is it possible to do this without Text Encoding? Maybe via Array.Copy() ?

Thanks for any advice.

check this stackoverflow.com/questions/13618231/…

Arunprasanth K V
– Arunprasanth K V

2015-02-23 10:56:03 +00:00
Commented Feb 23, 2015 at 10:56 — Arunprasanth K V
– Arunprasanth K V, Commented Feb 23, 2015 at 10:56
Do you know exact position of your guid in the byte array?

dyatchenko
– dyatchenko

2015-02-23 10:56:06 +00:00
Commented Feb 23, 2015 at 10:56 — dyatchenko
– dyatchenko, Commented Feb 23, 2015 at 10:56

Cyril Durand · Accepted Answer · 2015-02-23 11:21:19Z

2

You can Use Buffer.BlockCopy

    Byte[] fileBytes = new Byte[bytes.Length - 16];
    Buffer.BlockCopy(bytes, 16, fileBytes, 0, fileBytes.Length);

BTW Guid is normally 16 bytes length, 38 is string length

edited Feb 23, 2015 at 11:21

answered Feb 23, 2015 at 11:01

Cyril Durand

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1 Comment

Nils Over a year ago

This does work, as it truncates my byteArray, but unfortunatelly my pdf is not readable. Seems to be a problem with how many bytes to skip.

Utsav Dawn · Accepted Answer · 2015-02-23 11:00:53Z

1

For the part of returning a substring of an array, you can use ArraySegment<T>. Refer to this link

answered Feb 23, 2015 at 11:00

Utsav Dawn

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