Byte[] to float[] to Byte[]

Question

For some calculations I need to use Floats, but I have an byte[] at my disposal so I first do:

Array.Copy(byteArray, floatArray, byteArray.Length);

That works great, I the do some calulations on the floats.but now I need to convert it back to an byteArray. I can't use the following code, it crashes, without giving an specific error message.

float[] DiffernetfloatArray= new float[ byteArray];  
Array.Copy(DiffernetfloatArray, byteArray, DiffernetfloatArray.Length);

First I thought it was the size that wasn't OK, but the float array that I'm using, I increased the size by 500 just for testing, still gave me same error

Does anyone know how I could fix this? Preferably answers in C#

You should read this. http://stackoverflow.com/questions/5896680/int-array-to-byte-array?rq=1 — Security Hound, Dec 13 '12 at 15:42

score 4 · Answer 1 · answered Dec 13 '12 at 15:43

4

its easier with linq:

var byteArray = floatArray.Select(f => Convert.ToByte(f)).ToArray();
var floatArray = byteArray.Select(b => (float)Convert.ToDouble(b)).ToArray();

answered Dec 13 '12 at 15:43

lante

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`Array.ConvertAll` is much preferred. – leppie Dec 14 '12 at 08:13
i don't think so, you have to write more code becouse you haven't a converter to float, so you have to write a method to convert it – lante Dec 14 '12 at 13:57

score 2 · Answer 2 · answered Dec 13 '12 at 15:44

2

There's an easier way:

System.BitConverter.GetBytes(float)

MSDN

answered Dec 13 '12 at 15:44

Sten Petrov

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cjk · Answer 3 · 2012-12-14T08:10:26.920

-2

A byte can be converted to a float as it will fit within the type, but going the other way cannot be done with an implicit conversion - a float may be far too big to fit into a byte, therefore an Array.Copy will never work in this scenario.

edited Dec 14 '12 at 08:10

answered Dec 13 '12 at 15:41

cjk

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@0A0D - A byte array and a float array. Each value will be a one-to-one mapping, therefore one float will have to fit into one byte. – cjk Dec 13 '12 at 16:36
You can have a larger byte array. – Dec 13 '12 at 17:15
You could, but Array.Copy with 3 arguments won't do that. – cjk Dec 13 '12 at 20:54

Byte[] to float[] to Byte[]

3 Answers3