[AccessD] Automation between 2 applications

Backroads Data backroad at idir.net
Tue Sep 9 13:51:15 CDT 2003


William -

Quick question - you said:
    "...works like a charm in all versions ...HTH :))))"

Does that apply to Windows versions as well?  This is an Access97 runtime application (installed with Sagekey scripts), that is running on everything from Windows95 up.  Thanks.

Best Regards,

Julie Schwalm
Backroads Data
www.backroadsdata.com
785-594-6807
  ----- Original Message ----- 
  From: William Hindman 
  To: Access Developers discussion and problem solving 
  Sent: Tuesday, September 09, 2003 12:06 PM
  Subject: Re: [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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