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convert single array to bytes array

Posted on 2009-05-15
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Last Modified: 2012-05-07
i wrote a code that convert single array to bytes array - it work fine but i want a faster way because the bigger the single array gets the slower this code is
can any one help. thanks
Dim lvPointer, lvJ As Integer
Dim lvBlobBytes() As Byte
Dim lvBytes As Byte
Dim lvSingle() As single
 
ReDim lvBlobBytes(UBound(lvSingle) *4)
 
lvPointer = 0
For lvI = 0 To UBound(lvSingle)
      lvBytes = BitConverter.GetBytes(lvSingle(lvI))
       For lvJ = 0 To 3
             lvBlobBytes.SetValue(lvBytes(lvJ), lvPointer + lvJ)
        Next
        lvPointer = lvPointer + 4
Next

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Question by:sayeth
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5 Comments
 
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Expert Comment

by:aikimark
ID: 24404633
You can do this with a single API call, although it will operate in unmanaged space.  Here is an example of the CopyMemory invocation from a VB.Net application:
http://www.codeproject.com/KB/vb/netcopymemorysample.aspx


Look about half way down this page for an array copy example using System.Buffer, which keeps it all in managed space:
http://www.codeproject.com/KB/vb/CopyMemory_in_Net.aspx

Imports System.Buffer
Imports System.Text
Dim Str As String = "Adnan Samuel"
Dim MyBytesString() As Byte, i As Integer
Dim int(3) As short 'integer array
'Convert string to byte and copy to byte array
 
MyBytesString = Encoding.Default.GetBytes(Str)
'Use BlockCopy method to copy block of bytes array
 
'to integer array of specified length (8)
 
Buffer.BlockCopy(MyBytesString, 0, int, 0, 8)
'Print to output window

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Author Comment

by:sayeth
ID: 24425401
sorry for the late reply. i don't want to copy. i want to covert a single or a decimal array to byte array
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Expert Comment

by:aikimark
ID: 24426056
I don't think you can bypass the copying of the data from one array to another.  What I've supplied are two methods to copy the data in one operation, rather than one (or more) operations per array item.

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Author Comment

by:sayeth
ID: 24426182
yes, i understand what you saying.  i m trying to covert a single or a decimal array to byte array without any  loop
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Accepted Solution

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aikimark earned 500 total points
ID: 24426628
I have linked you to two methods that will copy the data without looping.  I have done this with VB6 and can tell you it works as intended.
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