Member Avatar for cabsjonel

hi! folks merry christmas and happy new year to all of you
ahhm! i have problem in using the .bas module i mean declaring global varibles from it, I try several times to use the variable that i declared in .bas module but did not work so can you help me.. and give some example program from it

hoping for your kindness


God bless all

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A few practical clarifications about .bas modules and "global" variables in classic Visual Basic (VB6). demonstrated the basic idea; asked for details — the usual causes when a module-level variable seems to "not work" are scope mistakes, shadowing by local variables, initialization-order issues, or a project reset wiping module state. It is not primarily a memory-size problem.

Common checklist to diagnose a missing value:

  • Declaration must be at module scope (top of a standard .bas), not inside a Sub/Function.
  • Use Option Explicit and compile to catch typos that create new, unintended variables.
  • Check for a local variable or a control with the same name that shadows the module name.
  • Module-level state is cleared when the project is stopped, when End is used, or after an unhandled error — explicit initialization is safer.
  • If sharing state across separate EXE/DLL projects, module visibility and export rules differ.

A safer pattern than lots of bare globals is a tiny application-state class exposed through a single well-initialized instance. Example class (Class module named CAppState) and standard module init:

' Class module: CAppState
Option Explicit
Private mUserName As String

Public Property Get UserName() As String
    UserName = mUserName
End Property

Public Property Let UserName(ByVal v As String)
    mUserName = v
End Property
' Standard module
Option Explicit
Public AppState As CAppState

Public Sub InitApp()
    Set AppState = New CAppState
End Sub

Call InitApp at program startup (Sub Main or main form load). This keeps state encapsulated, makes debugging easier, and limits accidental name collisions.

For a one-week lending-system project: pick a simple datastore (Access .mdb via ADO or CSV), implement core tables (Books, Members, Loans), focus first on borrow/return logic (check availability, create loan, decrement/increment counts), then add simple search and validation, and finish with basic reports. Prioritize a working checkout/return flow and clear transaction/error handling — additional features (fines, detailed reports) can be deferred.

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Member Avatar for selvaganapathy

Hi, Happy Christmas and Happy New Year.

Lets come to the discussion,
Use Public keyword declare a public variable in a module so that all other modules and forms can access it.

Ex:-

'In a module
   Public sUserName As String

'In a Form (Form1 )
' - Draw a Button (Command Button - cmdSetUser)
' >> Add Form (Form2)
' - Draw a Button (Command Button - cmdShowUser)

'In Form1
Option Explicit

Private Sub cmdSetUser_Click()
   sUserName = "ABCD"
   Form2.Show
End Sub
'In Form2
Option Explicit

Private Sub cmdShowUser_Click()
   MsgBox sUserName
End Sub

But avoid often using global variables.

Edited by selvaganapathy because: n/a
Member Avatar for cabsjonel

hey! thanks brother ur such a generous person now i know how to use it ahhm! bro why do you say that avoid often using global variable is it cause a lot of memory but thanks anyway,
but bro i have a big problem about my project its a lending system
our teacher give this kind of project and he told us to self study only
and you know i have only 1 week to finish it and i dont know what to do bro can you help me pls

Member Avatar for selvaganapathy

When u use global variable, u may face some problems .
See this site for detail. It is common for all the languages. So dont use it often.

Dont worry about your project.

Just try out your project, if u have any doubt u post it here.
Definitely not only myself, any one can help you .. but try from your side is very important .. Do well.

Member Avatar for abu taher

nice. what kind of problem u faced u not mentioned. so tell it clearly.

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