Standard BAS Module

Visual Basic 6 stores its code in the form of module that makes your program more structured. So its very important to learn about it. 

Before you start

Its recommended that you first have the concepts of scope, procedure,functions and multiple forms. The following lessons are helpful.

What is a module?

Module is a separate code file in Visual Basic that contains procedures and declarations.

Your entire VB6 program code does not come line by line. Instead they are separated in code files called modules, each of them is separated into procedures. Thus your VB6 program becomes well structured which is the key part of developing Visual Basic applications.

Form Module

The complete code including procedures and declarations part of a form is referred to as the form module.

Advantages of a BAS module

When the problem is large, its better to break it down into smaller parts to make it easy.
  • Breaks down the problem: It makes your program more understandable.
  • Executing common code repeatedly: You generally write the common piece of code in the routines of a module. Then you can execute the same piece of code repeatedly without writing them several times. That means the common piece of code resides in module.
  • Time & effort: Saves time and effort. 
  • Accessibilty: The procedures stored in the BAS module are accessible from all forms, from any part of your project.

How to add a Standard BAS module to the current project?

Project -> Add Module. Click Project menu from the menu bar and select add module.  

A separate project file with the .bas extension is saved on your hard disk as soon as you add a standard module to your current project. You can change the Name property of your newly added standard module from the properties window. Choose a meaningful name, it will benefit you while writing the code.

The modules are shown in project explorer window:


Contents of the standard module

  1. Procedure definitions
  2. Variable, type and constant declarations.  

The variables and constants declared using the Public keyword in the Declrations section of the module  are global, accessible from all parts of your current application.

An easy example:

'Inside the BAS Module

'Scope is Public to make it accessible from anywhere of the application
Public Sub show()
    MsgBox "Welcome to vbtutes"
    MsgBox "This is a message"
    MsgBox "New message!"
    MsgBox "List of messages"
End Sub
Public Function increment(number As Integer) As Integer
    increment = number + 1
End Function

'In form1

Private Sub cmdShow_Click()

    Dim num As Integer
    Dim m As Integer
    num = InputBox("Enter the number", "Input")
    m = Module1.increment(num)
    MsgBox m

End Sub

' In Form2

Private Sub Form_Load()
End Sub

' In Form3
'The show sub procedure is global

Private Sub Form_Load()
End Sub

Note: BAS modules are especially useful in large projects. So if you're developing a big VB6 application, include them.