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4/8/2010

This function enables an application to negotiate an TAPI version to use.

Syntax 

LONG lineNegotiateAPIVersion(
  HLINEAPP 
hLineApp, 
  DWORD 
dwDeviceID, 
  DWORD 
dwAPILowVersion, 
  DWORD 
dwAPIHighVersion, 
  LPDWORD 
lpdwAPIVersion, 
  LPLINEEXTENSIONID 
lpExtensionID
);

Parameters

hLineApp

[in] Handle to the application's registration with TAPI.

dwDeviceID

[in] Identifier of the line device to be queried.

dwAPILowVersion

[in] Least recent TAPI version the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

dwAPIHighVersion

[in] Most recent TAPI version the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

lpdwAPIVersion

[out] Pointer to a DWORD-sized location that contains the TAPI version number that was negotiated. If negotiation succeeds, this number is in the range between dwAPILowVersionand dwAPIHighVersion.

lpExtensionID

[out] Pointer to a structure of type LINEEXTENSIONID. If the service provider for the specified dwDeviceIDparameter supports provider-specific extensions, then, upon a successful negotiation, this structure is filled with the extension identifier of these extensions. This structure contains all zeros if the line provides no extensions. An application can ignore the returned parameter if it does not use extensions.

Return Value

Zero indicates success. A negative error number indicates that an error occurred. The following table shows the return values for this function.

Value Description

LINEERR_BADDEVICEID

The device identifier provided is incorrect.

LINEERR_NODRIVER

No driver was found.

LINEERR_INCOMPATIBLEAPIVERSION

The API version is incompatible.

LINEERR_OPERATIONFAILED

The operation failed.

LINEERR_INVALAPPHANDLE

The handle was invalid.

LINEERR_RESOURCEUNAVAIL

The resource is unavailable.

LINEERR_INVALPOINTER

The pointer is invalid.

LINEERR_UNINITIALIZED

The parameter is uninitialized.

LINEERR_NOMEM

No memory is available.

LINEERR_OPERATIONUNAVAIL

The operation is unavailable.

LINEERR_NODEVICE

No devide was found.

Remarks

Use the lineInitializefunction 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 is used to negotiate the TAPI version number to use. It also retrieves the extension identifier supported by the line device, and returns zeros if no extensions are supported. If the application wants to use the extensions defined by the returned extension identifier, it must call the lineNegotiateExtVersionfunction to negotiate the extension version to use.

The TAPI version number negotiated is that under which TAPI can operate. If version ranges do not overlap, the application and API or service provider versions are incompatible and an error is returned.

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