some problems with VB .NET

Hello!

I have problems with this code:

VB Code:

Public Interface IPhone
 
    Enum CallState As Integer
        Idle        
        Dialing    
        Ringing     
        Speaking   
    End Enum
 
    Enum CallResult As Integer
        Normal      
        NoCustomer  
        NoRing      
        [Error]       
    End Enum
 
    Sub Dial(ByVal telephoneNo As String) 
    Sub Hangup()
    Property State() As CallState
    Property LastResult() As CallResult
 
End Interface
 
Public Class MyPhone
    Inherits Form1
    Implements IPhone
 
    Dim linea As AxetTT37.AxetLine
    Dim CallState As IPhone.CallState
 
    Private _state As IPhone.CallState = CallState.Idle
 
    Public Sub [New]()
        linea = New AxetTT37.AxetLine
        linea.DeviceName = "AVM ISDN TAPI Services (Cntrl 1)"    
        linea.DeviceActive = True
    End Sub
 
     ReadOnly Property State() As IPhone.CallState Implements IPhone.State
      Get
          Return _state
   End Get
   End Property
 
    Public Sub Dial(ByVal telephoneNo As String) Implements IPhone.Dial
        linea.CallPhoneNumber = telephoneNo
        linea.CallDial()
        _state = CallState.Dialing
    End Sub
 
    Public Sub Hangup() Implements IPhone.Hangup
        If linea.CallActive Then    
            linea.CallHangup()      
            linea.CallActive = False
            _state = CallState.Idle 
        End If
    End Sub
 
End Class

1. I get these errors:
In line: ReadOnly Property State() As IPhone.CallState Implements IPhone.State i got underlined IPhone.State() ->
IPhone.State in State()
Property: 'State' cannot implement 'State' because there is no matching property
on Interface 'Iphone'

- underlined IPhone when i define the class -> MyPhone must implement 'Propery State() As CallState' for interface Iphone

How can i fix that?


2. How can I access [New], Dial from class MyPhone in any other Form
(like Form1...)?


tnx for help

perhaps

VB Code:

Public Enum CallState As Integer
   Idle
   Dialing
   Ringing
   Speaking
End Enum
 
Public Enum CallResult As Integer
   Normal
   NoCustomer
   NoRing
   [Error]
End Enum
 
Public Interface IPhone
 
   Sub Dial(ByVal telephoneNo As String)
   Sub Hangup()
   Property State() As CallState
   Property LastResult() As CallResult
 
End Interface
 
Public Class MyPhone
   Inherits Form1
   Implements IPhone
 
   Dim linea As AxetTT37.AxetLine
   Dim CallState As IPhone.CallState
 
   Private _state As IPhone.CallState = CallState.Idle
 
   Public Sub [New]()
      linea = New AxetTT37.AxetLine()
      linea.DeviceName = "AVM ISDN TAPI Services (Cntrl 1)"
      linea.DeviceActive = True
   End Sub
 
   Property State() As CallState Implements IPhone.State
      Get
         Return _state
      End Get
      Set(ByVal Value As CallState)
         ' blah
      End Set
   End Property
 
   ' implement this
   Property lastresult() As CallResult Implements IPhone.LastResult
      Get
         ' blah
      End Get
      Set(ByVal Value As CallResult)
         ' blah
      End Set
   End Property
 
   Public Sub Dial(ByVal telephoneNo As String) Implements IPhone.Dial
      linea.CallPhoneNumber = telephoneNo
      linea.CallDial()
      _state = CallState.Dialing
   End Sub
 
   Public Sub Hangup() Implements IPhone.Hangup
      If linea.CallActive Then
         linea.CallHangup()
         linea.CallActive = False
         _state = CallState.Idle
      End If
   End Sub
End Class
 
' sample class...
Public Class SampleClass
   Dim p As New MyPhone()
   Sub New()
      p.[New]() ' call the new method
   End Sub
End Class

1. Either in your Inteface IPhone add a readonly attribute for State, or in your MyPhone class remove the readonly attribute from the property and define a set.

2. You need to assign a reference somehow in the other form.

Either..

VB Code:

Private m_PhoneForm As MyPhone
 
Public Sub New(ByVal phoneForm As MyPhone)
      m_PhoneForm = phoneForm

Or

Making the new form have a property and assigning the form to that property once you have created it.

VB Code:

'Assuming in instance of MyPhone
 
Dim newForm As New FormB
 
newForm.PhoneForm = Me
 
newForm.Show

Then all you need to do is use the private member.

VB Code:

m_PhoneForm.[New]
m_PhoneForm.Dial

tnx for help Carnifex.

I fixed the problem with Interface.

Now I have completed writing MyPhone class. So i want it to use now.
What is the right way of doing that?

In Form1 i added an ActiveX component,
and MyPhone class Inherits Form1(this component).

Can I now use MyPhone in Form1 or must I add New Form to my project?...
I don't know what is the "standard".


I tryed by adding a new Form(Form2.vb) into my project:

VB Code:

Public Class Form2
    Inherits System.Windows.Forms.Form
Private m_PhoneForm As MyPhone
    Public Sub New(ByVal phoneForm As MyPhone)
        m_PhoneForm = phoneForm
    End Sub
 
 
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        m_PhoneForm.[New]()
        m_PhoneForm.Dial("031219202")
    End Sub
End Class

I get this error in line m_PhoneForm[New]() when i try to run the project:
An unhandled exception of type 'System.NullReferenceException' occurred in WindowsApplication10.exe

Additional information: Object reference not set to an instance of an object.

Might be a dumb question, but what is [New]? Or are the braces not suppose to be there?

because New is a reserved word i use [New]

I saw that in some examples...

You seem to have things correctly done w1nd. If I were you I would run thru the debugger and see what object is null (nothing).