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phoneNegotiateExtVersion
The phoneNegotiateExtVersion function allows an application to negotiate an extension version to use with
the specified phone device. This operation need not be called if the
application does not support extensions.
LONG phoneNegotiateExtVersion(
HPHONEAPP hPhoneApp,
|
| DWORD dwDeviceID,
|
| DWORD dwAPIVersion,
|
| DWORD dwExtLowVersion,
|
| DWORD dwExtHighVersion,
|
| LPDWORD lpdwExtVersion
|
| );
|
|
Parameters
hPhoneApp
The handle to the application's registration with TAPI.
dwDeviceID
The phone device to be queried.
dwAPIVersion
The API version number that was negotiated for the specified phone device
using phoneNegotiateAPIVersion.
dwExtLowVersion
The least recent extension version of the Extension ID returned by phoneNegotiateAPIVersion 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
The most recent extension version of the Extension ID returned by phoneNegotiateAPIVersion that the application is compliant with. The high-order word is the major
version number; the low-order word is the minor version number.
lpdwExtVersion
A pointer to a DWORD-sized location that contains the extension version number
that was negotiated. If negotiation is successful, this number will be in the
range dwExtLowVersion and dwExtHighVersion.
Return Values
Returns zero if the request is successful or a negative error number if an
error has occurred. Possible return values are:
PHONEERR_INVALAPPHANDLE, PHONEERR_OPERATIONFAILED, PHONEERR_BADDEVICEID,
PHONEERR_OPERATIONUNAVAIL, PHONEERR_NODRIVER, PHONEERR_NOMEM,
PHONEERR_INCOMPATIBLEAPIVERSION, PHONEERR_RESOURCEUNAVAIL, PHONEERR_INCOMPATIBLEEXTVERSION,
PHONEERR_UNINITIALIZED, PHONEERR_INVALPOINTER, PHONEERR_NODEVICE.
Remarks
The function phoneNegotiateAPIVersion is used to negotiate the API version number to use. It returns the extension
ID supported by the phone device, or zeros if no extensions are provided.
If the application wants to use the extensions defined by the returned
Extension ID, it must call phoneNegotiateExtVersion to negotiate the extension version to use.
Use phoneInitializeEx to determine the number of phone devices present in the system. The device ID
specified by dwDeviceID varies from zero to one less than the number of phone devices present.
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.
See Also
phoneInitializeEx, phoneNegotiateAPIVersion
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