Convert 4 Bytes To IEEE 754 32-bit Float?

Mar 15, 2011

I am receiving a data stream which contains 4 bytes of data which need to be converted to a 32-bit float (IEEE 754). This was easy to do in C as I created a union with a 4-byte array and a 32-bit float. Job done. However I have no idea how to accomplish this in VB (pls note I do not code in VB).

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I am reading and writing binary data through a serial port and must (a) reassemble the incoming four bytes that make up a IEEE single-precision float into an actual float, and (b) disassemble a float into its four constituent bytes before squirting them through the serial port.

I am using VB.NET 2008. In VB6, I could use the LSET command, as in:

Code:
Private Type typByteArray
B(1 To 4) As Byte
End Type

[Code]....

But of course this code won't work in VB.NET. In C it would be easy to handle situations like this by using unions, but VB.NET doesn't support them.

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Follow-Up available: There's a follow-up with further details, see Convert MBF to IEEE.

I've got some legacy data which is still in use, reading the binary files is not the problem, the number format is. All floating point numbers are saved in MBF format (Single and Double). I've found a topic about that on the MSDN boards but that one only deals with Single values. I'd also would like to stay away from API-Calls as far as I can.

Edit: Just in case somebody needs it, here is the VB.NET Code (it's Option Strict compliant) I ended up with (feel free to convert it to C# and edit it in):

''' <summary>Converts a MBF Single to an IEEE Single</summary>
''' <param name="src">The MBF Single value</param>
''' <returns>The converted IEEE Single value</returns>

[Code]...

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[Code]...

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able to convert an integer to a float then to that sort of hex.

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Here's the c# followed by the vb.net function.

private byte[] StringToByteArray(String hex)
{
int NumberChars = hex.Length;
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[CODE]...

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[CODE]...

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I now have to convert this across to c++ and have the following so far:

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but am getting stuck at this point. I'm sure I'm missing a simple syntax error but I can't figure it out!To clarify, I'm not getting an error, but I don't think the string is being converted to bytes correctly as when I convert back, I just get a '01'

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-- ----------------------------
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Code (For Better understand):

CODE:

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[Code]...

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[Code]...

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Public
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