Microsoft KB Archive/147214

Knowledge Base

ACC: How to Retrieve the MS Access Window Handle

Article ID: 147214

Article Last Modified on 1/19/2007

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APPLIES TO

• Microsoft Access 95 Standard Edition
• Microsoft Access 97 Standard Edition

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This article was previously published under Q147214

SUMMARY

Advanced: Requires expert coding, interoperability, and multiuser skills.

This article shows you how to create a sample user-defined function to retrieve the handle to the Microsoft Access window. This article also shows you to use the sample function to do the following:

• Minimize, maximize, and restore the Microsoft Access window.
• Determine if the Microsoft Access window is minimized, maximized, or restored.
• Move and size the Microsoft Access window.

This article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to the "Building Applications with Microsoft Access for Windows 95" manual.

MORE INFORMATION

Every window in the Microsoft Windows environment has a unique number, or window handle, assigned to it that is used to identify the window. The window handle is a required argument for many Microsoft Windows application programming interface (API) functions.

The following steps show you how to create the sample function, GetAccesshWnd(), that you can use to retrieve the Microsoft Access window handle.

NOTE: You may have some Microsoft Windows API functions defined in an existing Microsoft Access library; therefore, your declarations may be duplicates. If you receive a duplicate procedure name error message, remove or comment out the declarations statement in your code.

1. Create a new module.

2. Add the following lines to the module's Declarations section:

         Option Explicit
   
         Declare Function apiGetActiveWindow Lib "user32" Alias _
            "GetActiveWindow" () As Long
         Declare Function apiGetParent Lib "user32" Alias "GetParent" _
            (ByVal hwnd As Long) As Long
                           

3. Type the following function in the module:

         Function GetAccesshWnd ()
            Dim hWnd As Long
            Dim hWndAccess As Long
   
            ' Get the handle to the currently active window.
            hWnd = apiGetActiveWindow()
            hWndAccess = hWnd
   
            ' Find the top window without a parent window.
            While hWnd <> 0
               hWndAccess = hWnd
               hWnd = apiGetParent(hWnd)
            Wend
   
            GetAccesshWnd = hWndAccess
   
         End Function
                           

How to Use the GetAccesshWnd() Function

General Use:

1. Press CTRL+G to open the Debug window.
2. Type the following line in the Debug window, and then press ENTER:

    ? GetAccesshWnd()

   Note that the window handle for the Debug window is returned.

How to Minimize, Maximize, or Restore the Microsoft Access Window:

1. Add the following to the module's Declarations section:

         Declare Function apiShowWindow Lib "user32" Alias "ShowWindow" _
            (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
   
         Global Const SW_MAXIMIZE = 3
         Global Const SW_SHOWNORMAL = 1
         Global Const SW_SHOWMINIMIZED = 2
                           

2. Type the following functions in the module:

         Function AccessMinimize()
            AccessMinimize = apiShowWindow(GetAccesshWnd(), SW_SHOWMINIMIZED)
         End Function
   
         Function AccessMaximize()
            AccessMaximize = apiShowWindow(GetAccesshWnd(), SW_MAXIMIZE)
         End Function
   
         Function AccessRestore()
            AccessRestore = apiShowWindow(GetAccesshWnd(), SW_SHOWNORMAL)
         End Function
                           

3. To run these functions, type the following in the module's Debug window, and then press ENTER

    ? <function name>()
   
   -or-
   
   <function name>

   where <function name> is the name of one of the functions in step 2.

How to Determine If the Microsoft Access Window Is Minimized, Maximized, or Restored:

1. Add the following to the module's Declarations section:

         Declare Function apiIsIconic Lib "user32" Alias "IsIconic" (ByVal _
            hwnd As Long) As Long
         Declare Function apiIsZoomed Lib "user32" Alias "IsZoomed" (ByVal _
            hwnd As Long) As Long
                           

2. Enter the following functions in the module:

         Function IsAccessMaximized ()
            If apiIsZoomed(GetAccesshWnd()) = 0 Then
               IsAccessMaximized = False
            Else
               IsAccessMaximized = True
            End If
         End Function
   
         Function IsAccessMinimized ()
            If apiIsIconic(GetAccesshWnd()) = 0 Then
               IsAccessMinimized = False
            Else
               IsAccessMinimized = True
            End If
         End Function
   
         Function IsAccessRestored ()
            If IsAccessMaximized() = False And _
                  IsAccessMinimized() = False Then
               IsAccessRestored = True
            Else
               IsAccessRestored = False
            End If
         End Function
                           

3. To run these functions, type the following in the module's Debug window, and then press ENTER

    ? <function name>()

   where <function name> is the name of one of the functions in step 2. This will return a True if the Microsoft Access window is maximized, or a False if it is not.

How to Move and Size the Microsoft Access Window:

1. Add the following to the module's Declarations section:

         Declare Function apiMoveWindow Lib "user32" Alias "MoveWindow" _
            (ByVal hwnd As Long, ByVal x As Long, ByVal y As Long, ByVal _
            nWidth As Long, ByVal nHeight As Long, ByVal bRepaint As Long) _
            As Long
                           

2. Enter the following function in the module:

         Function AccessMoveSize (iX As Integer, iY As Integer, iWidth As _
            Integer, iHeight As Integer)
            apiMoveWindow GetAccesshWnd(), iX, iY, iWidth, iHeight, True
         End Function
                           

To move the Microsoft Access window to the upper-left corner of the screen and size it to the standard VGA display size of 640 x 480 pixels, type the following in the module's Debug window:

 ? AccessMoveSize(0, 0, 640, 480)

On a computer configured with the standard VGA video driver, this will give the Microsoft Access window the appearance of being maximized, although it is really restored and sized to fill the screen. Note that the dimensions you supply to this function are in pixels.

REFERENCES

For more information about Window handles in Microsoft Access version 2.0, please see the following article here in the Microsoft Knowledge Base.

113881 ACC: How to Retrieve the Microsoft Access Window Handle (1.x, 2.0)

Keywords: kbhowto kbprogramming KB147214

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