CODEWITHSUNDEEP
c#floating-pointhexarrays
kelevra88
kelevra88

Reputation: 1562

Byte Array to Float Conversion C#

I have tried the below C# code to convert from hex literal to floating point and get the correct result. I wish to input a byte array instead and have that converted to floating point but can't seem to get it right result.

0x4229ec00 is the current format. I need it in byte array format something like...

new byte[]{ 0x01, 0x04, 0x01, 0x60, 0x00, 0x02, 0x70, 0x29}; //current output 42.48

The code looks like:

byte[] bytes = BitConverter.GetBytes(0x4229ec00);
float myFloat = floatConversion(bytes);

public float floatConversion(byte[] bytes)
{
    float myFloat = BitConverter.ToSingle(bytes, 0);
    return myFloat;
}

Any help would be greatly appreciated. Thank you!

Upvotes: 3

Views: 12241

Answers (2)

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186833

float (Single) is a 4 Byte value;

Your test value 0x4229ec00 contains 4 bytes, they are: 0x42, 0x29, 0xEC, 0x00

x86 CPUs use reversed order of bytes (Little Endian), so the right byte array is

0x00, 0xEC, 0x29, 0x42

The Code

// Original array
Byte[] data = new Byte[] {0x42, 0x29, 0xEC, 0x00};
// 42.48047
// If CPU uses Little Endian, we should reverse the data 
float result = BitConverter.ToSingle(BitConverter.IsLittleEndian? data.Reverse().ToArray() : data, 0);

Upvotes: 2

Rajnikant
Rajnikant

Reputation: 2234

You can amend your float conversion function as below 

    public float floatConversion(byte[] bytes)
    {
        if (BitConverter.IsLittleEndian)
        {
            Array.Reverse(bytes); // Convert big endian to little endian
        }
        float myFloat = BitConverter.ToSingle(bytes, 0);
        return myFloat;
    }

Upvotes: 7

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