"GigaMuxer"  wrote in message
news:ldCdndkkKtFciZnfRVn-rA{at}comcast.com...

> "Using CopyMemory to push the bytes into UDT" This is what
> I am looking for.  Do you have a similar example(s)?

I've never been "into" all this professional database stuff and so I don't
quite understand what you mean by all these "packets" and
"payloads"
buzzwords, but if your data file is arranged in the way I think it might be
then you don't need to use CopyMemory and you can instead load the data
straight into an array.

You say that your file contains a number of packets and that each packet
contains 32 bytes of data consisting of 3 header bytes and 29 data bytes. Is
that correct? In that case, your file will always be an exact whole multiple
of 32 bytes long. Is that also true? If the answer to both of those
questions is "yes" then you can read and analyze the data very easily. The
following example doesn't contain any error checking code or anything, and
is just a simple "starting point" for you, but it is capable of
very rapidly
reading the entire 5 MB file into memory in such a way that you can then
"get at" the data of any packet you desire without any further disk access.
Paste the following code into a VB Form containing one command button and
one list box . . .

Mike

Option Explicit
Private Type Packet
  sync As Byte
  identifier As Byte
  type As Byte
  data(0 To 28) As Byte
End Type

Private Sub Command1_Click()
Dim n As Long, p As Long
Open "c:\mike.dta" For Binary As 1
ReDim blocks(0 To LOF(1) / 32 - 1) As Packet
Get 1, 1, blocks()
Close 1
' The number of the first block is 0 and the number
' of the last block is UBound(blocks)
'
' check correct operation by displaying the
' contents of the first block (block 0)
n = 0
List1.AddItem blocks(n).sync
List1.AddItem blocks(n).identifier
List1.AddItem blocks(n).type
For p = 0 To 28
  List1.AddItem blocks(n).data(p)
Next p
End Sub








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