TSPI_lineOpen (Windows Embedded CE 6.0)

1/6/2010

This function opens the line device whose device identifier is given, returning the service provider's handle for the device. The service provider must retain the TAPI handle for the device for use in subsequent calls to the LINEEVENT callback procedure.

Syntax

LONG TSPIAPI TSPI_lineOpen(
  DWORD dwDeviceID, 
  HTAPILINE htLine, 
  LPHDRVLINE lphdLine, 
  DWORD dwTSPIVersion, 
  LINEEVENT lpfnEventProc 
);

Parameters

• dwDeviceID
  Line device to be opened.

• htLine
  TAPI handle for the line device to be used in subsequent calls to the LINEEVENT callback procedure to identify the device.

• lphdLine
  Pointer to an HDRVLINE where the service provider fills in its handle for the line device.

• dwTSPIVersion
  TSPI version.

• lpfnEventProc
  Pointer to the LINEEVENT callback procedure supplied by TAPI that the service provider calls to report subsequent events on the line.

Return Value

Returns zero if the function succeeds, or an error number if an error occurs. The following table shows the return values for this function.

Remarks

The service provider should reserve any non-sharable resources that are required to manage the line. However, any actions that can be postponed to the lineMakeCall function should be. It is a design assumption in TAPI that lineOpen is an "inexpensive" operation. For example, if the line is opened in monitor mode only, it should not be necessary for a COMM-port-based service provider to open the COMM port.

This procedure does not correspond directly to any procedure at the TAPI level, at which the functions that enable device-specific extensions, select line characteristics, and set media type detection are included in the functionality defined by lineOpen. At the TSPI level, these additional capabilities are separated out into the TSPI_lineNegotiateExtVersion, TSPI_lineSetDefaultMediaDetection and TSPI_lineConditionalMediaDetection functions.

Requirements

See Also

Reference

TSPI Line Device Functions
LINEEVENT
TSPI_lineClose
TSPI_lineConditionalMediaDetection
TSPI_lineNegotiateExtVersion
TSPI_lineNegotiateTSPIVersion
TSPI_lineSetDefaultMediaDetection