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4/8/2010

This function allows an application to negotiate an extension version to use with the specified line device. This operation need not be called if the application does not support extensions.

Syntax 

LONG WINAPI lineNegotiateExtVersion(
  HLINEAPP 
hLineApp,
  DWORD 
dwDeviceID,
  DWORD 
dwAPIVersion,
  DWORD 
dwExtLowVersion,
  DWORD 
dwExtHighVersion,
  LPDWORD 
lpdwExtVersion 
);

Parameters

hLineApp

Handle to the application's registration with TAPI.

dwDeviceID

Line device to be queried.

dwAPIVersion

TAPI version number that was negotiated for the specified line device using lineNegotiateAPIVersion.

dwExtLowVersion

Least recent extension version of the extension identifier returned by the lineNegotiateAPIVersionfunction that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

dwExtHighVersion

Most recent extension version of the extension identifier returned by lineNegotiateAPIVersionthat the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

lpdwExtVersion

Pointer to a DWORDthat contains the extension version number that was negotiated. If negotiation succeeds, this number is in the range between dwExtLowVersionand dwExtHighVersion.

Return Value

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

Value Description

LINEERR_BADDEVICEID

The device identifier is incorrect.

LINEERR_NOMEM

Not enough memory is available.

LINEERR_INCOMPATIBLEAPIVERSION

The API version is incompatible.

LINEERR_NODRIVER

The driver was not found.

LINEERR_INCOMPATIBLEEXTVERSION

The extension version is incompatible.

LINEERR_OPERATIONFAILED

The operation failed.

LINEERR_INVALAPPHANDLE

The handle to the applications registration with TAPI is invalid.

LINEERR_RESOURCEUNAVAIL

The resources are unavailable.

LINEERR_INVALPOINTER

The pointer is invalid.

LINEERR_UNINITIALIZED

A parameter is uninitialized.

LINEERR_NODEVICE

The device was not found.

LINEERR_OPERATIONUNAVAIL

The operation is unavailable.

Remarks

Use the lineInitializeExfunction to determine the number of line devices present in the system. The device identifier specified by dwDeviceIDvaries from zero to one less than the number of line devices present.

The lineNegotiateAPIVersionfunction negotiates the API version number to use. It also retrieves the extension identifier supported by the line device, which is zeros if no extensions are provided. Version numbers should be incremented by one for each release. Leaving gaps in release version numbering can cause unexpected results.

If the application wants to use the extensions defined by the returned extension identifier, it must call lineNegotiateExtVersionto negotiate the extension version to use.

The extension version number negotiated is that under which the application and service provider must both operate. If version ranges do not overlap, the application and service provider versions are incompatible and an error is returned.

Note:
This function is for TAPI version 2.0 and later.

Requirements

Header tapi.h
Library coredll.lib
Windows Embedded CE Windows CE 1.0 and later
Windows Mobile Windows Mobile Version 5.0 and later

See Also