.Net Marshalling. How to?

[RajashreeR]

I'm integrating with an SDK from my VB .net application. One of the function call requires passing a BSTR and structure pointer. It also has two other parameters that are enumerations. I don't know the datatype for these Enumerations. How do I make the call. My code is someting like this:

Dim lChannel As New SmIa.SInputChan nel
Dim lStructSize As Integer

lStructSize = Marshal.SizeOf( GetType(SmIa.SI nputChannel))

With lChannel
.bw = SmIa.Bandwidth. bwBroad
.res = SmIa.Resolution .reHigh
.type = SmIa.InputChann elId.icMicropho ne
End With

Dim lPtr As IntPtr = Marshal.AllocHG lobal(lStructSi ze)

Marshal.Structu reToPtr(lChanne l, lPtr, False)

Dim lResChannel As SmIa.SInputChan nel = CType(Marshal.P trToStructure(l Ptr, GetType(SmIa.SI nputChannel)), SmIa.SInputChan nel)

Dim lStrUser As String = "r"
Dim lStrPtr As IntPtr = Marshal.StringT oBSTR(lStrUser)
Dim lResUserName As String = Marshal.PtrToSt ringBSTR(lStrPt r)
Dim lLang As Integer = SmIa.LanguageId .lngUK

cTraining.Open( lResUserName, lResChannel, lLang, lLang)
Marshal.FreeBST R(lStrPtr)

Of these SmIa.SInputChan nel, SmIa.LanguageId are the structure and enum from the SDK.

Thanks for the help in advance

[RedSon]

A quick search on this site reveals...

http://bytes.com/forum/thread214191.html