Solved

Calling Form in Global Function

Posted on 2002-03-08
5
161 Views
Last Modified: 2010-05-02
    In our global functions in code modules, we very often need to extract parameters from variables in the form that called the function, like so:
 
Public Function Foo(frmCaller As Form) As Boolean
   Dim x as Integer
   x = frmCaller.intDataInForm
   ... more code ...
End Function
 
     I'm hoping this is a need that is so common that there is a slick way to handle it. It seems dopey to specify "frmCaller" in so many global functions.
 
     Any thoughts?
0
Comment
Question by:GebhartBob
5 Comments
 
LVL 18

Accepted Solution

by:
bobbit31 earned 50 total points
ID: 6851087
one way to do it:

in your module do:

Public curForm as Form

Public Function Foo(frmCaller As Form) As Boolean
  Dim x as Integer
  x = frmCaller.intDataInForm
  ... more code ...
End Function

in your form code:

set curForm to current Form

public sub command1_click()
   
   set curForm = Me
   call Foo()

end sub    

0
 
LVL 18

Expert Comment

by:mdougan
ID: 6851509
Short of passing all the necessary variables as parameters, there really isn't a cleaner way of doing it.

bobbit31's approach is what I sometimes take if my code happens to be in a class instead of a global code module:


My class might have this code:

Public curForm as Form

Public Function Foo() As Boolean
 Dim x as Integer
 x = curForm.intDataInForm
 ... more code ...
End Function

Then, in my code I might have:

Dim oTemp as New MyClass

Set oTemp.curForm = Me
If oTemp.Foo then.....

0
 
LVL 15

Expert Comment

by:ameba
ID: 6851832
There are many ways to pass parameters or access form's properties/methods.
Early bound solution would be to define some interface, implement that interface in form(s) and pass "Me" to function:

' in Form:
Implements IFormData
Private Property Get IFormData_intDataInForm() As Integer
     IFormData_intDataInForm = 100
End Property
' to call function, use:
     res = Foo(Me)

' in bas module:
Public Function Foo(frmCaller As IFormData) As Boolean
     x = frmCaller.intDataInForm
End Function

' class IFormData (interface)
Option Explicit
Public Property Get intDataInForm() As Integer
End Property
0
 

Author Comment

by:GebhartBob
ID: 6857439
    Thanks, everybody.
0
 

Author Comment

by:GebhartBob
ID: 7063282
    Finally, the light dawns on this subject:
 
     If you declare in your standard code module (.bas) the following:
 
     Public frm As Form
 
     Then in the Form_Activate Event of every Form module include as the first line the following:
 
     Set frm = Me
 
     The global variable "frm" will always contain the current Form object, so that references to data, Subs and Functions declared as Public in Forms modules can be coded like this:
 
     frm.Variable = (Whatever)
     result = frm.Function(par1, par2, ... parN)
 
     It's simple, and it works very nicely.
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Validating VB6 Function 19 59
A macro to Count the number of rows across all worksheets 3 93
Advice in Xamarin 21 78
RUNRMTCMD from AS/400 12 44
Have you ever wanted to restrict the users input in a textbox to numbers, and while doing that make sure that they can't 'cheat' by pasting in non-numeric text? Of course you can do that with code you write yourself but it's tedious and error-prone …
If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question