Activex control

[Rich Strang]

Hi

I'm just starting out in VB so please be patient.

I am creating an activex control, in the class there is a single variable
that is to be validated when set. Currently I am using the let/get property
to set and retrieve this value. Should I perform the validation within the
let property or within a function that then calls the let, I ask this as a
let does not seem to be able to return a value.

Thanks in advance.

Rich

[mayayana]

You can validate the value sent in the Let procedure
to make sure it's a valid setting. Is that what you mean?
If you want to return a result you need to use a function.

Private Name1 as string

Public Property Let Name(sName as string)
'-- you can validate whether this incoming value is a relevant string
'-- but you need a function to return a result. In this case, you'll
'-- assign incoming value to property only if first letter is "m".
'-- If they send "tree" the property will not be set but they won't
'-- know that unless you raise an error.

if (len(sName) > 0) then
If Ucase$(Left$(sName, 1)) = "M" then Name1 = sName
end if
End Property

Public Property Get Name() as String
Name = Name1
End Property

I'm just starting out in VB so please be patient.

I am creating an activex control, in the class there is a single variable
that is to be validated when set. Currently I am using the let/get property to set and retrieve this value. Should I perform the validation within the let property or within a function that then calls the let, I ask this as a
let does not seem to be able to return a value.

Thanks in advance.

Rich

[Rich Strang]

You can validate the value sent in the Let procedure
to make sure it's a valid setting. Is that what you mean?
If you want to return a result you need to use a function.

Ok thanks I think I need to use a function then.

Rich

[mayayana]

There's no problem with that. The only reason to use
a Property is because it's clean and easy from the other
side. They can just use:

s = Ob.Name
or
Ob.Name = s

But you could also use a Boolean function:

Public Function Name(sName as String) as Boolean

and they'd then call it with:

Bool1 = Ob.Name(s)
If Bool1 = True then '-- s was valid.

You can validate the value sent in the Let procedure
to make sure it's a valid setting. Is that what you mean?
If you want to return a result you need to use a function.

Ok thanks I think I need to use a function then.

Rich