.Net DLL and System.Call
 

I have a .net VB dll containing a function that returns a list of sql servers as a string but i cant get nsis to return the value from it although i know the function works having tested it in a .net windows application. Below is my NSI code and my DLL code. Any help would be appreciated.

NSI #################################
Name "SQLServerCheck"
OutFile "SQLServerCheck.exe"

!include "${NSISDIR}\Examples\System\System.nsh"

Section "dummy"
System::Call 'Utils::GetServerList()'
Pop $0
Pop $1
DetailPrint $0
DetailPrint $1
SectionEnd

VB .Net Code #############################
Public Class Utils

Public Shared Function GetServerList() As String
Dim oApp As New SQLDMO.Application
Dim i As Integer
Dim s As String
s = ""
For i = 0 To oApp.ListAvailableSQLServers.Count
If Not oApp.ListAvailableSQLServers.Item(i) Is Nothing Then
s += oApp.ListAvailableSQLServers.Item(i).ToString & " "
End If
Next
s = Trim(s)
oApp = Nothing
Return s
End Function

Public Shared Function GetDatabaseList(ByVal server As String, ByVal username As String, ByVal password As String)
Dim oServer As New SQLDMO.SQLServer
Try
oServer.Connect(server, username, password)
Dim i As Integer
Dim s As String
s = ""
For i = 1 To oServer.Databases.Count
s += oServer.Databases.Item(i).Name & " "
Next
s = Trim(s)
oServer.DisConnect()
oServer = Nothing
Catch
oServer = Nothing
End Try
End Function
End Class

You can't call .NET exported functions, only non-managed functions. That is, only functions that are shown with Dependency Walker.