VB.NET – Convert Integers to a Byte Array

arraysstreamvb.net

I have the following Java code working as expected, to convert some numbers to an array of Bytes before writing to a stream.

byte[] var1 = new byte[]{
    (byte)-95,
    (byte)(240 / 256 / 256 % 256),
    (byte)(240 / 256 % 256),
    (byte)(240 % 256),
    (byte)0
};

I need to write the same in VB .net
I tried the following code in VB .net, but no success.

Dim var1(4) As Byte
    var1(0) = Byte.Parse(-95)
    var1(1) = Byte.Parse(240 / 256 / 256 Mod 256)
    var1(2) = Byte.Parse(240 / 256 Mod 256)
    var1(3) = Byte.Parse(240 Mod 256)
    var1(4) = Byte.Parse(0)

Am I doing it wrong.? How to get it done properly..

Thank you.

Best Answer

You can convert an integer (32 bit (4 byte)) to a byte array using the BitConverter class.

Dim result As Byte() = BitConverter.GetBytes(-95I)

Dim b1 As Byte = result(0) '161
Dim b2 As Byte = result(1) '255
Dim b3 As Byte = result(2) '255
Dim b4 As Byte = result(3) '255

Related Solutions

C# – Convert Byte Array to Int

BitConverter is the correct approach.

Your problem is because you only provided 8 bits when you promised 32. Try instead a valid 32-bit number in the array, such as new byte[] { 0x32, 0, 0, 0 }.

If you want an arbitrary length array converted, you can implement this yourself:

ulong ConvertLittleEndian(byte[] array)
{
    int pos = 0;
    ulong result = 0;
    foreach (byte by in array) {
        result |= ((ulong)by) << pos;
        pos += 8;
    }
    return result;
}

It's not clear what the second part of your question (involving strings) is supposed to produce, but I guess you want hex digits? BitConverter can help with that too, as described in an earlier question.

C# Arrays – How to Convert a Byte Array into an Int Array

Simple:

//Where yourBytes is an initialized byte array.
int[] bytesAsInts = yourBytes.Select(x => (int)x).ToArray();

Make sure you include System.Linq with a using declaration:

using System.Linq;

And if LINQ isn't your thing, you can use this instead:

int[] bytesAsInts = Array.ConvertAll(yourBytes, c => (int)c);

Best Answer

Related Solutions

C# – Convert Byte Array to Int

C# Arrays – How to Convert a Byte Array into an Int Array

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