[AccessD] Automation between 2 applications

Julie

...I've used the following code since A97 in my Autoexec macro to handle multiple instances of my Access apps being opened by users ...it should meet all of your stated needs ...just modify the IfThen to call your process.

...copy and insert the following module as mdlCheckMultipleInstances

Option Compare Database
Option Explicit

' Module mdlCheckMultipleInstances
' © Graham Mandeno, Alpha Solutions, Auckland, NZ
' graham at alpha.co.nz
 
Private Const cMaxBuffer = 255
 
Private Declare Function apiGetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    
Private Declare Function apiGetDesktopWindow Lib "user32" _
  Alias "GetDesktopWindow" _
  () As Long
  
Private Declare Function apiGetWindow Lib "user32" _
  Alias "GetWindow" _
  (ByVal hwnd As Long, _
  ByVal wCmd As Long) _
  As Long
  
Private Const GW_CHILD = 5
Private Const GW_HWNDNEXT = 2
 
Private Declare Function apiGetWindowText Lib "user32" _
  Alias "GetWindowTextA" _
  (ByVal hwnd As Long, _
  ByVal lpString As String, _
  ByVal aint As Long) _
  As Long
  
Private Declare Function apiSetActiveWindow Lib "user32" _
  Alias "SetActiveWindow" _
  (ByVal hwnd As Long) _
  As Long
 
Private Declare Function apiIsIconic Lib "user32" _
  Alias "IsIconic" _
  (ByVal hwnd As Long) _
  As Long
 
Private Declare Function apiShowWindowAsync Lib "user32" _
  Alias "ShowWindowAsync" _
  (ByVal hwnd As Long, _
  ByVal nCmdShow As Long) _
  As Long
 
Private Const SW_SHOW = 5
Private Const SW_RESTORE = 9

Public Function winGetClassName(hwnd As Long) As String
Dim sBuffer As String, iLen As Integer
  sBuffer = String$(cMaxBuffer - 1, 0)
  iLen = apiGetClassName(hwnd, sBuffer, cMaxBuffer)
  If iLen > 0 Then
    winGetClassName = Left$(sBuffer, iLen)
  End If
End Function
 
Public Function winGetTitle(hwnd As Long) As String
Dim sBuffer As String, iLen As Integer
  sBuffer = String$(cMaxBuffer - 1, 0)
  iLen = apiGetWindowText(hwnd, sBuffer, cMaxBuffer)
  If iLen > 0 Then
    winGetTitle = Left$(sBuffer, iLen)
  End If
End Function
 
Public Function winGetHWndDB(Optional hWndApp As Long) As Long
Dim hwnd As Long
winGetHWndDB = 0
If hWndApp <> 0 Then
  If winGetClassName(hWndApp) <> "OMain" Then Exit Function
End If
hwnd = winGetHWndMDI(hWndApp)
If hwnd = 0 Then Exit Function
hwnd = apiGetWindow(hwnd, GW_CHILD)
Do Until hwnd = 0
  If winGetClassName(hwnd) = "ODb" Then
    winGetHWndDB = hwnd
    Exit Do
  End If
  hwnd = apiGetWindow(hwnd, GW_HWNDNEXT)
Loop
End Function
 
Public Function winGetHWndMDI(Optional hWndApp As Long) As Long
Dim hwnd As Long
winGetHWndMDI = 0
If hWndApp = 0 Then hWndApp = Application.hWndAccessApp
hwnd = apiGetWindow(hWndApp, GW_CHILD)
Do Until hwnd = 0
  If winGetClassName(hwnd) = "MDIClient" Then
    winGetHWndMDI = hwnd
    Exit Do
  End If
  hwnd = apiGetWindow(hwnd, GW_HWNDNEXT)
Loop
End Function
 
Public Function winCheckMultipleInstances(Optional fConfirm As Boolean = True) As Boolean
Dim fSwitch As Boolean, sMyCaption As String
Dim hWndApp As Long, hWndDb As Long
On Error GoTo ProcErr
  sMyCaption = winGetTitle(winGetHWndDB())
  hWndApp = apiGetWindow(apiGetDesktopWindow(), GW_CHILD)
  Do Until hWndApp = 0
    If hWndApp <> Application.hWndAccessApp Then
      hWndDb = winGetHWndDB(hWndApp)
      If hWndDb <> 0 Then
        If sMyCaption = winGetTitle(hWndDb) Then Exit Do
      End If
    End If
    hWndApp = apiGetWindow(hWndApp, GW_HWNDNEXT)
  Loop
  If hWndApp = 0 Then Exit Function
  If fConfirm Then
    If MsgBox(sMyCaption & " is already open@" _
      & "Do you want to open a second instance of this database?@", _
      vbYesNo Or vbQuestion Or vbDefaultButton2) = vbYes Then Exit Function
  End If
  apiSetActiveWindow hWndApp
  If apiIsIconic(hWndApp) Then
    apiShowWindowAsync hWndApp, SW_RESTORE
  Else
    apiShowWindowAsync hWndApp, SW_SHOW
  End If
  Application.Quit
ProcEnd:
  Exit Function
ProcErr:
  MsgBox err.Description
  Resume ProcEnd
End Function

...then put this as a RunCode in your AutoExec macro

winCheckMultipleInstances (True) 

...works like a charm in all versions ...HTH :))))

William Hindman
So, then, to every man his chance -- to every man, regardless of his birth, his shining golden opportunity -- to every man his right to live, to work, to be himself, to become whatever his manhood and his vision can combine to make him -- this, seeker, is the promise of America. 
-- Thomas Wolfe 



  ----- Original Message ----- 
  From: Backroads Data 
  To: AccessD 
  Sent: Tuesday, September 09, 2003 11:59 AM
  Subject: [AccessD] Automation between 2 applications


  Hello Group,

  I have 2 (related) questions on this subject...

  Question 1: If another application (it's not Access, I believe it's C++) uses the Shell command to launch my Access application, and the Access app is already open, will this simply make the Access app "active", or will it launch a 2nd instance of it?  (I'm wanting it to make my app active, not open another copy.)

  Question 2: Is there any kind of "Application.Activation" event I can hook into?  If the above issue can be resolved to activate the Access app, I need Access to go to a specific form and process a small amount of data from the launching application.  (I can do this if the other app actually opens the Access app, but am not sure if I can call this processing routine when the already-open app is activated.)

  Thanks in advance for any direction you can provide.

  Best Regards,

  Julie Schwalm
  Backroads Data
  www.backroadsdata.com
  785-594-6807


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