PureBoard

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Private Function P2S(lngPtr As Long) As String
    ' Pointer to string. Returns a string of a pointer in VB6.
    ' Example call:
    ' Debug.Print "Version: " & P2S(FunctionName(Parameter))
    Dim strTemp As String
    Dim lngLen As Long
    If lngPtr Then
        lngLen = lstrlenW(lngPtr) * 2
        If lngLen Then
            strTemp = Space(lngLen)
            CopyMemory ByVal strTemp, ByVal lngPtr, lngLen
            P2S = Left(strTemp, InStr(1, strTemp, Chr(0)) - 1)
        End If
    End If
End Function

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Imports System.Runtime.InteropServices
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Vom Windows Form Designer generierter Code "

    Public Sub New()
        MyBase.New()

        ' Dieser Aufruf ist für den Windows Form-Designer erforderlich.
        InitializeComponent()

        ' Initialisierungen nach dem Aufruf InitializeComponent() hinzufügen

    End Sub

    ' Die Form überschreibt den Löschvorgang der Basisklasse, um Komponenten zu bereinigen.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    ' Für Windows Form-Designer erforderlich
    Private components As System.ComponentModel.IContainer

    'HINWEIS: Die folgende Prozedur ist für den Windows Form-Designer erforderlich
    'Sie kann mit dem Windows Form-Designer modifiziert werden.
    'Verwenden Sie nicht den Code-Editor zur Bearbeitung.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(16, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(128, 64)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Go"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(16, 88)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(128, 20)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = "TextBox1"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        MsgBox(VBGetHeiligeKuh())
    End Sub
End Class
Module DLL_Zugriff
    <DllImport("pbtest.dll", EntryPoint:="HeiligeKuh")> _
        Public Function GetHeiligeKuh() As IntPtr
    End Function
    Public Function VBGetHeiligeKuh() As String
        Dim sDummy As String = "Nix"
        Dim Handle As IntPtr

        Try
            Handle = GetHeiligeKuh()
            sDummy = Marshal.PtrToStringAnsi(Handle) 'ansi
            'sDummy = Marshal.PtrToStringUni(Handle)  'unicode

        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try
        Return sDummy
    End Function
End Module

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[DllImport("pbtest.dll")]
public extern static [MarshalAs(UnmanagedType.LPStr)]string PbFunction();