Re: No valid handle from lineGetID(.. "comm/datamodem") after dialing remote. Please Help.

From: Grant Schenck (schenckg_at_optonline.net)
Date: 02/12/04 

Date: Thu, 12 Feb 2004 13:09:56 -0500

Won't work.

The MS Remote TSP will only remote call control, not data or wave
features.

I suspect that lineGetID is going through to the server and coming
back with a value relevant to that server, not the client where you
are invoking the function. 

--
Grant Schenck
Grant Schenck Software
schenckg@optonline.net
http://grantschenck.tripod.com
"Karsten Strobel" <strobel@ait-augsburg.de> wrote in message
news:uzDPMmV8DHA.3052@TK2MSFTNGP09.phx.gbl...
> Hi All,
>
> I have a big problem with accessing remote modems and I really hope
someout
> here can help me.
>
> I have a data modem attached to a Windows NT Server 4.0 SP6a. I want
to do a
> data call from a client PC (Windows 2000 Prof) using that modem over
the
> RemoteSP.TSP. All what I am doing seems to work well when I'm using
a local
> modem, but the remote case gives me headache.
>
> After successfully calling lineMakeCall(), having received the
LINE_REPLY
> for that call, I receive a LINE_CALLSTATE callback with
> dwParam1=LINECALLSTATE_CONNECTED. So far, no problems.
>
> Then, when I lineGetID() with dwSelect=LINECALLSELECT_CALL, hCall=my
call
> handle and lpszDeviceClass="comm/datamodem", I can access the comm.
handle
> (hComm) and the device name string from the returned VARSTRING
structure.
> The hComm handle seems to be a reasonable value (something like 304
or 411
> or so), but in fakt it is not valid.
>
> Of course, I cannot really expected to get a hComm handle of the
> communication port which I can directely access from the client,
since the
> hardware is connected to the server and is not local to the client.
I was
> expecting to get something like a named pipe handle which would
allow me to
> transparentely communicate over the modem using
ReadFileEx/WriteFileEx as I
> would do with a local device. However, every such call to
> ReadFileEx/WriteFileEx ect. fails with a "invalid handle" error
result.
>
> So what kind of a hComm handle does the RemoteSP.TSP give me? How
can I use
> it or what must I do in order to send or receive data to or from the
> connected data modem?
>
> Thanks for your help!!
>
> Best Regards
> Karsten
>
>

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