On 8/18/2006 12:52 PM, [EMAIL PROTECTED] wrote:
> On Aug 18, 2006, at 16:43 UTC, Charles Calvert wrote:
>
>> Assuming that the overhead of multiple executing shell commands is too
>> much, should I continue to pursue using API functions as my best bet?
>
> You can execute a single shell with the command "sh" (or "tcsh" or
> "bash" or whatever shell you prefer), then give it multiple copy
> commands with Shell.Write.
Thanks.
> If it's still too slow, I think you're out of luck -- keep in mind that
> both the shell commands (cp and ditto) and RB's own file-copying
> commands are already using API functions, and not purposely wasting
> time about it. It's unlikely you could do any better with declares,
> unless there is some shortcut available due to the unique constraints
> of your app.
That's what I would have thought, then I ran some tests. I wrote a very
simple app to copy a folder hierarchy from one place to another. It
calls the Ticks function at the beginning and end to track the time.
The copying function is a simple recursive one:
Sub CopyItem(item As FolderItem, dest As FolderItem)
Dim i As Integer
Dim child As FolderItem
Try
If item.Directory Then
child = dest.Child(item.Name)
child.CreateAsFolder()
For i = 1 To item.Count
CopyItem(item.Item(i), child)
Next i
Else
item.CopyFileTo(dest)
End If
Catch ex As RuntimeException
MsgBox "Unable to copy item: '" + _
m_folderSource.Item(i).AbsolutePath + "'. Error: " + _
ex.Message
End Try
End Sub
When running on a Mac Mini with a 1.4 GHz G4 and 1 GB of RAM, the
program took 38 minutes to copy a 17 GB hierarchy. Finder took only 28
minutes to perform the same task. That's a pretty big difference.
--
Charles Calvert
Celtic Wolf, Inc.
(703) 580-0210
[EMAIL PROTECTED]
http://www.celticwolf.com/
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