Re: lineGetID() on PocketPC / Compact Framework
From: Matthias Moetje (moetje_at_terasens_nospam_.de)
Date: 02/24/05
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Date: Thu, 24 Feb 2005 18:20:10 +0100
Peter,
from the PSDK:
***********************************************
comm/datamodem/portname
The comm/datamodem/portname device class consists of the device names to
which modems are attached. When this device name is specified in a call to
the lineGetID function, the function fills the VARSTRING structure with a
null-terminated ANSI (not Unicode) string specifying the name of the port to
which the specified modem is attached, such as "COM1\0". This is intended
primarily for identification purposes in the user interface, but could be
used under some circumstances to open the device directly, bypassing the
service provider (if the service provider does not already have the device
open itself). If there is no port associated with the device, a null string
("\0") is returned in the VARSTRING structure (with a string length of 1).
***********************************************
So, since the service provider already has the device open, you cannot use
the com port for doing communications. You really need to use the file API
and probably you would also need to do overlapped I/O. I believe that this
is not possible from managed code, especially not on CE platforms, so you
should create a component in eVC++ for the I/O and use that from your
managed code (there are ways to do this...).
Best regards,
Matthias Moetje
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TERASENS GmbH
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"Peter Beedell" <p-beedell@wellcom.de> wrote in message
news:%23noWNqoGFHA.3352@TK2MSFTNGP10.phx.gbl...
Hi,
The TAPI function lineGetID() is documented as returning the com port I can
use to transfer data once a GSM DataCall has been established:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tapi/tapi2/comm_datamodem.asp
Here is my C# implementation:
int iResult = lineGetID(myLine.hLine, myCall.AddressID, myCall.hCall,
LINECALLSELECT.LINE, baVarString, "comm/datamodem/portname");
For me, running on an MDA II / XDA II, this fails. Reducing the TAPI Device
Class to "comm/datamodem" works but this returns a IntPtr handle to the port
which forces me to use the File APIs because C# can not open a stream using
a device handle... am I missing the point here?
How is a C# programmer supposed to exchange data using the DataCall he has
established using TAPI?
Best regards,
Peter Beedell p-beedell@wellcom.de
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