Dear All ,

I have a device with upon serial communication , it send the data as HEX values , (eg, C020042ABD0F91A103E400F929EBC) . I use the following code to get data from the serial port.

Dim fStream As New FileStream(sFileName, FileMode.CreateNew) ' creates new file
        Dim bw As New BinaryWriter(fStream)

        ComTd.Read(data, 1, bCount)

           Dim bCount As Integer = 4119 ' it is the size of the chunk not block size
           Dim data(bCount) As Byte

           bw.Write(data)                ' This saves the byte array to a binary file .

The problem is that the stored data are in hex not decimal . I want to covert this HEX data in the byte array to a decimal to save into binray file .




Edited by __avd: Added [code] tags. Do wrap your programming code blocks within [code] ... [/code] tags

6 Years
Discussion Span
Last Post by Unhnd_Exception

You can use the Convert.ToInt32 function to get the numeric

dim int as integer = Convert.ToInt32("AF3",16)

If I knew more about the format of the serial data I could give you a better example.


Dear Unhnd ,

Thanks for your fast response , but the problem is that I had the bytes in an array. I need to convert each 2 bytes into one HEX . This is because I receive from the device through serial communcation data that are in HEX mode (eg C020042ABD0F91A103E400F929EBC) . Upon receive data from serial port into Byte , the data are transformed into ASCII code for each letter , eg , "C0" is a HEX number , however , the byte read it as C [and converts it to 67 which is the ASCII code for C] and the 0 [and converts it to 48] . I need to first read each 2 bytes [ie C0] , and convert them to the decimal part [which is 192] , thus when it is saved to binary file , it is read correctly .


waleed.makarem @ gmail.com


See if this helps you

Dim fStream As New System.IO.FileStream("c:\asfas", IO.FileMode.Create)
Dim bWriter As New System.IO.BinaryWriter(fStream)

Dim data(4119) As Byte

For i = 0 To UBound(data) Step 2
    bWriter.Write(Convert.ToInt32(CStr(Convert.ToChar(data(i))) & CStr(Convert.ToChar(data(i + 1))), 16))

Unfortunately , I got the following error on line 8
"Could not find any recognizable digits."

Kindly advice.


Post the first 8 bytes read from the data array.


I can't help you any more.

Don't know if the packet has a header on it or not but cant get 36 or 80 into any recogizable hex value.

All I know is that

Dim dec As Integer = Convert.ToInt32(CStr(Convert.ToChar(67)) & CStr(Convert.ToChar(48)), 16)

Will give you your 192

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