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From: Remco on 24 Mar 2010 11:04
Hi all,

I'm trying to write an c# bluetooth wrapper which wraps native functions and
exposes them to my managed c# code. Everything sofar no big issue but I have
the following problem:

I try to do a discorery of all the bt devices in the neighbourhood using the
native method, WSALookupServiceBegin, which has the following invoke code:

[DllImport("ws2.dll", CharSet = CharSet.Auto, SetLastError = true,
EntryPoint= "WSALookupServiceBegin")]
public static extern int WSALookupServiceBegin(WSAQuerySet
lpqsRestrictions, uint dwControlFlags, ref IntPtr lphLookup);

I call this function in my code: result =
WS2Dll.WSALookupServiceBegin(wsaQuerySet, WS2Dll.LUP_RETURN_NAME, ref
hLookup);

wsaQuerySet is a struct, and hLookup is of type IntPtr. Before this call I
initialize the winsock library using WSAStartup and this returns correctly.

The result of the lookup method call is -1 and when I try to find out what
error occured I call WSAGetLastError() which returns 6. This means
Invalid_handle according to the winsock error list on msdn.

Can anyone tell me what I'm doing wrong here?

kind regards,

Remco
From: Peter Foot [MVP] on 25 Mar 2010 01:56
You could save yourself a lot of pain and download 32feet.NET:-
http://32feet.codeplex.com

This is tried and tested and is a shared-source project so you can see
exactly how it works.

Peter

--
Peter Foot
Microsoft Device Application Development MVP
peterfoot.net | appamundi.com | inthehand.com
APPA Mundi Ltd - software solutions for a mobile world
In The Hand Ltd - .NET Components for Mobility

"Remco" <Remco(a)discussions.microsoft.com> wrote in message
news:415AED62-7A1C-4B61-BEA3-4EEEB8067B51(a)microsoft.com...
> Hi all,
>
> I'm trying to write an c# bluetooth wrapper which wraps native functions
> and
> exposes them to my managed c# code. Everything sofar no big issue but I
> have
> the following problem:
>
> I try to do a discorery of all the bt devices in the neighbourhood using
> the
> native method, WSALookupServiceBegin, which has the following invoke code:
>
> [DllImport("ws2.dll", CharSet = CharSet.Auto, SetLastError = true,
> EntryPoint= "WSALookupServiceBegin")]
> public static extern int WSALookupServiceBegin(WSAQuerySet
> lpqsRestrictions, uint dwControlFlags, ref IntPtr lphLookup);
>
> I call this function in my code: result =
> WS2Dll.WSALookupServiceBegin(wsaQuerySet, WS2Dll.LUP_RETURN_NAME, ref
> hLookup);
>
> wsaQuerySet is a struct, and hLookup is of type IntPtr. Before this call I
> initialize the winsock library using WSAStartup and this returns
> correctly.
>
> The result of the lookup method call is -1 and when I try to find out what
> error occured I call WSAGetLastError() which returns 6. This means
> Invalid_handle according to the winsock error list on msdn.
>
> Can anyone tell me what I'm doing wrong here?
>
> kind regards,
>
> Remco

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