Question

I’m going to convert a C# floating point number into 2 bytes, for instance I have number 12.4544 and it should be 0x4147, or 0x41474539, I’ve used bitconverter.doubletoInt64, but it gives me something weird, how can I get 0x4147?

I’m creating a MODBUS slave, and I should send each float number as only 2 bytes

thanks

Answer 1

EDIT: Oh dear oh dear, I completely missed this, which is the short answer:

Use BitConverter.GetBytes and pass it a float, as shown here.

The long answer:

BitConverter doesn’t support single precision floats, just doubles. You’ll have to create a C# “union”, like so:

[StructLayout(LayoutKind.Explicit)]
class Floater
{
    [FieldOffset(0)]
    public float theFloat;
    [FieldOffset(0)]
    public int theInt;
}

Put your float in theFloat and look at theInt