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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