[AccessD] VBA and DOS Question

Hi Jeremy:

These routines are generally called from a local (in the same module)
function or subroutine that is public. 

Assuming that all this code is in an Access Module by just changing one line
this routine can be accessed from any Form or Report.

'Public Sub ShellAndWait(CommandLine As String) '

HTH
Jim

-----Original Message-----
From: accessd-bounces at databaseadvisors.com
[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Jeremy Toves
Sent: February 7, 2006 11:56 AM
To: AccessD
Subject: [AccessD] VBA and DOS Question

I hope somebody can shed some light on this.  Sometimes, I'll create and
launch batch files on the fly.  I worked around the problem of Access
running over the batch files before they completed by creating a
completion.txt file which my Access database polled for so it knew that the
process finished.  That was a less than desirable solution.  
  
I found a small piece of code that makes an API call to figure out when DOS
is complete before Access procedes.  It works great.  I'm just curious as to
why the subroutine is private.  I don't want to replicate this in each
module I use this API call.  Does anybody know why this should be private?
Here is the site I code I found.
   
  Thanks,
Jeremy Toves
   
 
http://visualbasic.about.com/od/learnvb6/l/bldykvb6dosa.htm?terms=vb+script+
close+window
   
  Private Declare Function OpenProcess _
    Lib "kernel32" ( _
    ByVal dwDesiredAccess As Long, _
    ByVal bInheritHandle As Long, _
    ByVal dwProcessId As Long) _
    As Long
Private Declare Function WaitForSingleObject _
    Lib "kernel32" ( _
    ByVal hHandle As Long, _
    ByVal dwMilliseconds As Long) _
    As Long
Private Declare Function CloseHandle _
    Lib "kernel32" ( _
    ByVal hObject As Long) _
    As Long
Private Const SYNCHRONIZE = &H100000
Private Const INFINITE = &HFFFF
   
  Sub Main()
    ShellAndWait ("C:\WINDOWS\system32\ping.EXE www.google.com")
End Sub
   
  Private Sub ShellAndWait(CommandLine As String)
    Dim ShellId As Long
    Dim ShellHandle As Long
    ShellId = Shell(CommandLine, vbNormalFocus)
    ShellHandle = OpenProcess(SYNCHRONIZE, 0, ShellId)
    If ShellHandle <> 0 Then
        WaitForSingleObject ShellHandle, INFINITE
        CloseHandle ShellHandle
    End If
End Sub
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