Rolf,
I think the structure description in the documentation may have mislead
you. Structures are not real arrays and cannot be used like an array in
most cases. But they are implemented as arrays.
Structures are a data type. They organize your data into a manageable
container. Your code only implements the structure. You must also create an
array of these structures for your purposes.
On Thu, Jul 16, 2015 at 8:20 AM, Rolf-Werner Eilert <
eilert-sprac...@t-online.de> wrote:
>
> Am 16.07.2015 16:05, schrieb Tobias Boege:
> > 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
> >
>
> Ok... so I have to initiate the arrays separately...
>
> Alright, now it's running fine!
>
> What I meant above with the arrays is this declaration:
>
>
> PUBLIC STRUCT Identifier
>
> Field 1 [ Embedded array declaration ] AS [ Datatype ]
> Field 2 [ Embedded array declaration ] AS [ Datatype ]
> .
> .
> .
> Field n [ Embedded array declaration ] AS [ Datatype ]
>
> END STRUCT
>
> When you never have worked with it it's confusing because it lets you
> think "a struct is a number of arrays". Then there's no example how to
> actually use it. Maybe the help text could be somewhat more concise here...
>
> Regards
> Rolf
>
>
>
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If you ask me if it can be done. The answer is YES, it can always be done.
The correct questions however are... What will it cost, and how long will
it take?
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