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).


Converting Bytes To IEEE Float And Vice Versa?

Dec 6, 2009

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:

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


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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C# - Convert MBF Single And Double To IEEE?

Jun 4, 2010

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>


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Aug 12, 2009

Private Function SingleToIEEE754Hex(ByVal pValue As Single) As String


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OK so in this hex editor I have, Hex Workshop, when I search for a 32 bit float i type in (lets just say) 1. It then spits it back at me in a 32 bit float, but also as hex.

the 32 bit float for 1 = 3F80 0000

I really cant grasp this idea, let alone put it into my program.

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

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See where my equivalent of a working c# assignment statement is not working?

bytes(i / 2) = Convert.ToByte(hex.Substring(i, 1), 16)

Here's the c# followed by the function.

private byte[] StringToByteArray(String hex)
int NumberChars = hex.Length;
byte[] bytes = new byte[NumberChars / 2];


And the that is throwing the error within the for loop

Private Function StringToByteArray(ByVal hex As String) As Byte()
Dim NumberChars As Int16 = CShort(hex.Length)


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Mar 8, 2009

My app displays the bytes downloaded in a label using:
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lblDownloaded.Text = ByteCount.ToString()
End Sub
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Jan 6, 2010

I have a single that might have a decimal place but might not. I have to put the digit before the decimal into the first 4 bytes and the digit after in the next 4 bytes.

So 1.1 would be 01-00-00-00-01-00-00-00
or 2.1 would be 02-00-00-00-01-00-00-00
or 1 would be 01-00-00-00-00-00-00-00

The digit before the decimal point is stored like an integer in bytes the same with the digit after the point. So 1.1 gets split into 1 and 1 and then stored as 2 DWORDS: 01000000 and 01000000

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I'm trying to convert standard bytes like so:


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I want it to go from bytes -> Base64.


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Jun 13, 2011

I'm trying to send a 28 character string to a remote ip address and port. I've done this successfully in using the following code snippets:

Dim swon As String = "A55A6B0550000000FFFBDE0030C8"
Dim sendBytes As [Byte]()
sendBytes = Encoding.ASCII.GetBytes(swon)
netStream.Write(sendBytes, 0, sendBytes.Length)

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

char *swon = "A55A6B0550000000FFFBDE0030C8";
array<Byte>^ sendBuffer = gcnew array<Byte>(bufferSize);
sendBuffer = BitConverter::GetBytes( swon );
tcpStream->Write(sendBuffer, 0, sendBuffer->Length);

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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-- Table structure for phpbb_posts
-- ----------------------------
CREATE TABLE `phpbb_posts` ([code]....

I want to convert those to regular text again but I have no clue how to script my converter to lookup the bytes place (after 0x) converts the string (as the bytes arent in array) and where to stop converting the bytes (after the ,)then replace the bytes text by the regular text and this needs to be in a loop because all posts need to be converted to normal text.

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I have string, what contains bytes... (Example below)

And I need convert these bytes into text... But I really don't know how...

Code (For Better understand):


and now, how to convert it into text? (The Result text in "ProductName", BTW)(I don't want to use Hex Editor still )

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Feb 9, 2009

I am working on a project that needs to send hex bytes ie.Sub receives an integer like 276 and then performs

Dim CmdBuf() As Byte = New Byte() {Byte1, Byte2}
strHex = Hex(intNumber) which makes strHex equal to 114 in hex...

Next I need to break into separate bytes something like

Byte1 = Left(strHex, 1)
Byte2 = Right(strHex, 2)

But this does not work......Hex value of 114 needs to be converted into a couple of bytes like &H1 &H14 to be sent out the serial port.

.Write(Buf, 0, 2)

How can I do this?

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I don't really want to use GDI+ or the System.Drawing library, but simply apply a certain calculation/processing to every byte of the image file and get another array that contains the RGB values of every pixel in that image. I know it could be done as I know how to do it in a different programming language (Python) but not in Visual Basic.

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The application is working good, i can receive data on port 48888 and i can write it to my logfile, but my problem is when i convert bytes to string. I have the correct data, but all the bufferReadSize is filled with space. Example: if i send only: test, my log file will have test and 4 lines of space only. In my code, right after Dim clientdata As String = Encoding.ASCII.GetString(bytes).

I tried to trim(), replaceI() or any string manipulation, and it's not working!%!? Is there anything i need to do before i can start manipulating that string?

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Nov 13, 2010

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Sep 16, 2011

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Bytes Written Exceed The Content-Length Bytes In XML Post?

Feb 19, 2011

I keep getting a ProtocolViolationException "Bytes to be written to the stream exceed the Content-Length bytes size specified." on the following code.I've tried setting Content-Length numerous ways with no success.

Dim url = ""
Dim req As WebRequest = WebRequest.Create(url)
req.Method = "POST"
req.ContentType = "application/xml"


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Dec 28, 2010

What exactly does this line do?

i = stream.Read(bytes, 0, bytes.Length)

Does it read the entire message string sent by the client? I have a line to write to the stream later in the code and that does not seem to be sending anything back to the client, although the code around is excuting.

i = stream.Read(bytes, 0, bytes.Length)
While (i <> 0)
' Translate data bytes to a ASCII string.


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Sep 22, 2011

I created a text file contains 4 bytes of data


I just want to read the first 2 bytes (AABB) to execute it with my program.

Then I'll need to read the last 2 bytes (CCDD) for another computer routines

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Aug 2, 2009

Probably missing something silly here, Her eis what my display looks like Sending image...(401303) I would prefer it displays as Sending image...(391 kb)


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Nov 30, 2011

I am working in windows application, I have one field in sql server which has data type decimal(15,10). When I enter data from application like "123456789012345". It should be convert it in 12345.678901234 when press tab on text box.

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May 18, 2010

My program works through each cell in a raster bitmap loooking at the r g b values. Actually I'm just working with greyscale so r = g = b. I use the get pixel method to return the 8 bit value of each pixel (0 - 255). However I'm now working with a single channel 32 bit float bitmap. I can't load it into VB. I tried Dim myBitmap As New Bitmap(OpenFileDialog1.FileName) but this fails with an unspecified error when trying to open a 32 bit tiff.

The question is: which graphics format will allow me to load a 32bit bitmap into VB, and if I succeed will the getpixel method return 32bit float results for the greyscale level for each pixel?

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Dec 18, 2010

Deviding an int by zero, will throw an exception, but a float won't - at least in Java. Why a float have an additional NaN info, while int haven't?

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i'm using Cint(12.5) this must be 13 but it is not so i try Round(12.5) but still not roundup what do i do?

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Nov 3, 2011

I am trying to assign a specific width to my image in (using So I used the next code:

<asp:Image ID="PercentageImage" runat="server" Height="7px"
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ImageUrl="~/images/bar.JPG" />

So how do i cast this one? (The type of votsGraph is float.)

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May 15, 2010

I'm building a card game called 11-UP. See the game here.I've gotten to the point where I need to make scores show up when the selected cards have a sum of 11. For example, if the card is worth 200 points, then "200" should become visible for about a second and then "float away".

I know I can do this with a timer and the location property. I was thinking of creating an array of 22 timers, one for each card. When the selected cards have a sum of eleven, I enable the timers for each selected card. The timer makes the "score" for that card appear, then move up a few times, then vanish.

Does anyone have a better way to do it? Maybe with only one timer?Also, how could I make the "scores" become more transparent as time advances? I'd like to make them not only float away, but also "disolve."

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Apr 30, 2011

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Sub GridCellValidation(ByRef dgvRow As DataGridViewRow, Optional ByVal FillControls As Boolean = False)


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Structure ThirtyminUPD
<VBFixedString(10)> Dim MSymbol As String
Dim MTime As Int16
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i do have a module well it works with 4bye and long but for some reason it doesnt work with float address

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