Solved

convert single array to bytes array

Posted on 2009-05-15
5
383 Views
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

Open in new window

0
Comment
Question by:sayeth
  • 3
  • 2
5 Comments
 
LVL 45

Expert Comment

by:aikimark
Comment Utility
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

Open in new window

0
 
LVL 1

Author Comment

by:sayeth
Comment Utility
sorry for the late reply. i don't want to copy. i want to covert a single or a decimal array to byte array
0
 
LVL 45

Expert Comment

by:aikimark
Comment Utility
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.

0
 
LVL 1

Author Comment

by:sayeth
Comment Utility
yes, i understand what you saying.  i m trying to covert a single or a decimal array to byte array without any  loop
0
 
LVL 45

Accepted Solution

by:
aikimark earned 500 total points
Comment Utility
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.
0

Featured Post

Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

I was working on a PowerPoint add-in the other day and a client asked me "can you implement a feature which processes a chart when it's pasted into a slide from another deck?". It got me wondering how to hook into built-in ribbon events in Office.
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now