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c#floating-pointhex
Ali_dotNet
Ali_dotNet

Reputation: 3279

Converting float to hex results in more digits than expected in C#?

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

Upvotes: 0

Views: 922

Answers (1)

zmbq
zmbq

Reputation: 39023

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

Upvotes: 4

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