ACC2000: How to Disable the Close Button (X) on the Access Application Window

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


This article applies to a Microsoft Access database (.mdb) and to a Microsoft Access project (.adp).


Summary

Microsoft Access has no built-in method for disabling the Close button (X) on the application window or the Close command on the System menu of the application window. This article describes how to programmatically disable both of these.

More Information

In order to disable the application Close button and the Close command on the System menu, you must call the GetSystemMenu and ModifyMenu functions from the Win32 API.

Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements.

Step-by-Step Example


  1. Start Microsoft Access.
  2. Open the sample database Northwind.mdb.
  3. On the Insert menu, click Class Module.
  4. Type the following code into the Declarations section:
    Option Compare Database
    Option Explicit

    Private Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As Long, _
    ByVal bRevert As Long) As Long

    Private Declare Function EnableMenuItem Lib "user32" (ByVal hMenu As _
    Long, ByVal wIDEnableItem As Long, ByVal wEnable As Long) As Long

    Private Declare Function GetMenuItemInfo Lib "user32" Alias _
    "GetMenuItemInfoA" (ByVal hMenu As Long, ByVal un As Long, ByVal b As _
    Long, lpMenuItemInfo As MENUITEMINFO) As Long

    Private Type MENUITEMINFO
    cbSize As Long
    fMask As Long
    fType As Long
    fState As Long
    wID As Long
    hSubMenu As Long
    hbmpChecked As Long
    hbmpUnchecked As Long
    dwItemData As Long
    dwTypeData As String
    cch As Long
    End Type

    Const MF_GRAYED = &H1&
    Const MF_BYCOMMAND = &H0&
    Const SC_CLOSE = &HF060&
  5. Add the following procedures to the class module:
    Public Property Get Enabled() As Boolean
    Dim hWnd As Long
    Dim hMenu As Long
    Dim result As Long
    Dim MI As MENUITEMINFO

    MI.cbSize = Len(MI)
    MI.dwTypeData = String(80, 0)
    MI.cch = Len(MI.dwTypeData)
    MI.fMask = MF_GRAYED
    MI.wID = SC_CLOSE
    hWnd = Application.hWndAccessApp
    hMenu = GetSystemMenu(hWnd, 0)
    result = GetMenuItemInfo(hMenu, MI.wID, 0, MI)
    Enabled = (MI.fState And MF_GRAYED) = 0
    End Property

    Public Property Let Enabled(boolClose As Boolean)
    Dim hWnd As Long
    Dim wFlags As Long
    Dim hMenu As Long
    Dim result As Long

    hWnd = Application.hWndAccessApp
    hMenu = GetSystemMenu(hWnd, 0)
    If Not boolClose Then
    wFlags = MF_BYCOMMAND Or MF_GRAYED
    Else
    wFlags = MF_BYCOMMAND And Not MF_GRAYED
    End If
    result = EnableMenuItem(hMenu, SC_CLOSE, wFlags)
    End Property
  6. On the File menu, click Save Northwind (to save the project), and when prompted for the name of the class module, save it as CloseCommand.
  7. On the Insert menu, click Module to create a new, standard module.
  8. Add the following procedure to the module:
    Function InitApplication()
    Dim c As CloseCommand
    Set c = New CloseCommand

    'Disable Close menu.
    c.Enabled = False
    End Function
  9. On the Debug menu, click Compile Northwind. If the project is not compiled successfully, correct the compilation errors, and then compile the project again.
  10. On the File menu, click Save Northwind, and use the default name that appears in the Module Name box by clicking OK.
  11. Create a new macro with the following actions and action arguments:

    Action
    -------
    RunCode

    Action Arguments
    -------------------------------
    Function Name: InitApplication()
  12. Save the macro and name it Autoexec.
  13. Close the database.
  14. Reopen the database.
Note that the Close button and the Close command on the System menu of the application window are disabled.

Usage

The CloseCommand class module described in this article allows you to easily enable or disable the Close button and the Close command of the application window. The class module also allows you to check the state of these commands to determine if they are currently enabled or disabled. Before doing either of these, your code must first create an instance of the CloseCommand class, as demonstrated in the InitApplication function earlier in this article.

To check the state of the Close button, refer to the Enabled property of the CloseCommand instance that your code created. Likewise, to set the state of the Close button, assign True or False to the Enabled property of the CloseCommand instance that your code created.

Please note that this technique affects the Close button on the application window of Microsoft Access, not the Close button on the Database window. After disabling the Close button, the button is not automatically reenabled when your database closes. If the user closes the database and leaves Microsoft Access open, the user will not be able to quit Microsoft Access by using the Close button. In this case, your application should reenable the Close button before it terminates. Otherwise, the user will have to quit and restart Microsoft Access in order for the Close button to be enabled.

This technique does not disable the Exit command on the File menu. If your application needs to disable this command, you must customize the File menu to remove the Exit command.
Properties

Article ID: 245746 - Last Review: Jun 23, 2005 - Revision: 1

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