Question

How can I store an int32 at a specific location in a byte array?

As far as I can tell, I need to use BitConverter.GetBytes(value); to get the byte[4].

Then I have a byte[whatever_size] and offset.

public void SetInt32(byte[] message, int offset, Int32 value)
{
var value_bytes = BitConverter.GetBytes(value);
message[offset] = value_bytes;
}

Answer 1

You can get the bytes directly by using bitwise arithmetic:

byte temp[4];
temp[3] = value & 0xFF;
temp[2] = (value >> 8) & 0xFF;
temp[1] = (value >> 16) & 0xFF;
temp[0] = (value >> 24) & 0xFF;
for(int i = 0; i < 4; i++)
    message[offset+i] = temp[i];