ACC2000: Access Methods That Reset The Visual Basic Project

ID: Q198637

The information in this article applies to:

Microsoft Access 2000

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

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

SYMPTOMS

When you use certain Access methods that modify modules or references, all variables in the same Visual Basic for Applications project are reset.

You reset your variables with the following methods:

AddFromFile (Module Object)
AddFromFile (References Collection)
AddFromString
AddFromGUID
CreateEventProc
DeleteLines
InsertLine
InsertText
ReplaceLine
Remove (References Collection)

CAUSE

These methods automatically reset the database's Visual Basic for Applications project.

RESOLUTION

Move any variables that you do not want to be reset to an add-in or library database. Add-ins and library databases have separate Visual Basic for Applications projects; therefore, variables stored in them are not affected when you use one of these methods.

MORE INFORMATION

A database's Visual Basic for Applications project consists of all the standard and class modules stored in the database. When you use one of the methods discussed in the Symptoms section of this article, the project is recompiled. This resets the project state, including any defined variables.

CAUTION: Following the steps in this example will modify the sample database Northwind.mdb. You may want to back up the Northwind.mdb file and perform these steps on a copy of the database.

Steps to Reproduce Behavior

Open the sample database Northwind.mdb.

Create a module and type the following lines in the Declarations section:


Option Explicit
Public pMyVar As String

Type the following procedure:


Sub CreateNewProc()
    Dim frm As Form
    Dim mdl As Module
    Dim ret As Long

    'Set Public Variable.
    pMyVar = "Hello"

    'Create a new form.
    Set frm = CreateForm()
    Set mdl = frm.Module

    'Create an event procedure in the form's module.
    ret = mdl.CreateEventProc("Load", "Form")

    'Display current contents of Public variable.
    MsgBox "pMyVar = " & pMyVar
End Sub

To test this procedure, type the following line in the Immediate Window, and press ENTER:
```
CreateNewProc 
```
Note that a form is created with an event procedure, followed by a message box that contains the contents of the public variable.

After the procedure has completed, type the following in the Immediate Window, and press ENTER:
```
?pMyVar 
```
Note that the public variable is reset and now contains an empty string.

REFERENCES

For more information about these methods, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type "the name of the method" in the Office Assistant or the Answer Wizard, and then click Search to view the topic.

For more information about class modules, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type "class modules, overview" in the Office Assistant or the Answer Wizard, and then click Search to view the topic.

For more information about library databases, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type "library databases" in the Office Assistant or the Answer Wizard, and then click Search to view the topic.

Additional query words: prb global public variables scope


Keywords          : MdlProb PgmObj 
Version           : WINDOWS:2000
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: July 15, 1999