On Thu, 16 Jul 2015, Rolf-Werner Eilert wrote:
> Never used a Struct, and now playing around with it I find the help
> texts cannot help me. This is what I tried:
>
> Public Struct Hund
> Wau As String
> End Struct
>
> Public Sub Button3_Click()
> Dim Wauwau As New Hund
>
> Wauwau.Wau = "Bone"
>
> Everything ok, but it's ONE Wauwau only. From the description, I would
> expect an array.
>
Why would you expect an array? And of what: an array of Struct Hund or an
array of Strings inside your one Hund instance? Arrays are only to be
expected where the "[]" occur.
> So I tried
>
> Public Struct Hund
> Wau As String[]
> End Struct
>
> Public Sub Button3_Click()
> Dim Wauwau As New Hund
>
> Wauwau.Wau.Add("Bone")
>
> and I get a "Null object" for the Add function.
>
> What's going wrong here?
>
What you did, in non-Struct terms, is basically this:
Dim myArray As String[]
myArray.Add("Bone")
You declared a variable which can hold an array of strings, did NOT create
the array and tried to add something to it. You should have done
Dim myArray As New String[]
myArray.Add("Bone")
or
Dim myArray As String[]
myArray = New String[]
myArray.Add("Bone")
and similarly
Dim Wauwau As New Hund
Wauwau.Wau = New String[]
Wauwau.Wau.Add("Bone")
A Struct is just a class without properties, methods and events. It has only
public variables.
Regards,
Tobi
--
"There's an old saying: Don't change anything... ever!" -- Mr. Monk
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