Form Events and Sub Procedures Can Be Exposed

The information in this article applies to:

• Standard, Professional, and Enterprise Editions of Microsoft Visual Basic, version 4.0, for Windows

SUMMARY

Visual Basic 4.0 forms are public. Therefore the form events and sub procedures are prefaced by the private keyword so they are not publicly visible members of the form.

MORE INFORMATION

In Visual Basic 3.0, a form's events and sub procedures are private to the form, and cannot be accessed outside of the form's scope. Because a Visual Basic 4.0 form is public, its events and sub procedures can be exposed by either prefacing it with Public or by removing Private from the event.

Step-by-Step Example

The following example works in Visual Basic 4.0 but not in Visual Basic 3.0. To create the program, do the following:

1. Start Visual Basic or from the File menu, choose New Project (ALT, F, N) if Visual Basic is already running. Form1 is created by default.

2. In Form1 enter the following code:

      Sub DispMsg ()
          MsgBox "Inside Sub"
      End Sub
   
   

3. Add a module to the project and in Module1 enter the following code:

      Sub main()
         'some other code stuff could go here
         Call Form1.DispMsg
      End Sub
   
   

4. Select the Tools, Options menu item and the Project tab. Set Startup Form to Sub Main.

5. Run this program. The Module1 Main sub procedure calls the DispMsg sub procedure in the form.