easy one - pass form and field to function

Dear experts -
I want to pass the current form name and the name of a text box (field) on that form to a function.
I then want the function to do certain things and in certain cases update that field.

How do I properly pass the form and field name, and then how do I properly reference them in the function?
Thanks!
terpsichoreAsked:
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John TsioumprisSoftware & Systems EngineerCommented: 
Public Function YourFunction (frm as form,TextBoxValue as string)

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You call it like this
YourFunction Me, Me.textbox.name

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terpsichoreAuthor Commented:
Thank you - how do I think reference that form+field to update it with a certain value, in the function?
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John TsioumprisSoftware & Systems EngineerCommented:
I am not 100% percent sure what you need,,,
I assume that you want to perform some operations in your function that will affect your form....
if this is correct then you need to modify the function to  like this
Public Function YourFunction (ByRef frm as form,TextBoxValue as string)

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but better to give some more info about your function
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terpsichoreAuthor Commented:
I'm trying to do something like this in the function, but it is giving me an error:

Function ShowLink(thislink As String, thisform As Form, thiscontrol As String)

Dim sFilename as string
sFileName = Mid(thislink, iBackslash + 1, (Len(thislink) - iBackslash))
thisform.thiscontrol = sFileName

On the last line above, I'm getting error 2465, Application-defined or object-defined error...
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John TsioumprisSoftware & Systems EngineerCommented: 
Function ShowLink(thisLink as string) as string
ShowLink=  = Mid(thisLink , iBackslash + 1, (Len(thislink) - iBackslash))
End function

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Then on the control you want to use it
me.thiscontrol = showlink(thisLink )

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terpsichoreAuthor Commented:
Also - when I'm passing the formname ('me'), I guess it is not fully referenced. Maybe this is part of the problem?
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John TsioumprisSoftware & Systems EngineerCommented:
Also to reference to a control from a frm object
frm.controls(thiscontrol.name)

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terpsichoreAuthor Commented:
sorry, I'm still not getting this. can you pls be more specific on how I should correct the error?
Thanks!
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John TsioumprisSoftware & Systems EngineerCommented: 
thisform.controls("thiscontrol") = sFileName

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Dale FyeCommented:
There are a number of ways to do this.

1.  You could pass the form and control names to your function/subroutine and then create objects within the procedure, something like:
Public function fnSomething(FormName as string, CtrlName as string)

    Dim frm as Form
    Dim ctrl as Control

    set frm = forms(FormName)
    set ctrl = frm.controls(CtrlName)

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2.  Or you could simply pass the form and control objects directly to your function:
Public Function fnSomething(frm as Form, ctrl as Control)

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In this case, to call the function you would simply use something like:

Call fnSomething(me, me.txt_TextboxName)
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terpsichoreAuthor Commented:
Definitely covered the waterfront - great responses from real experts. I am grateful.
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