The lineGetAddressCaps function queries the specified address on the specified line device to determine its telephony capabilities.
LONG lineGetAddressCaps( HLINEAPP hLineApp, DWORD dwDeviceID, DWORD dwAddressID, DWORD dwAPIVersion, DWORD dwExtVersion, LPLINEADDRESSCAPS lpAddressCaps );
Handle to the application's registration with TAPI.
Line device containing the address to be queried.
Address on the given line device whose capabilities are to be queried. An address identifier is permanently associated with an address; the identifier remains constant across operating system upgrades.
Version number of the Telephony API to be used. The high-order word contains the major version number; the low-order word contains the minor version number. This number is obtained by lineNegotiateAPIVersion.
Version number of the service provider-specific extensions to be used. This number can be set to zero if no device-specific extensions are to be used. Otherwise, the high-order word contains the major version number; and the low-order word contains the minor version number.
Pointer to a variably sized structure of type LINEADDRESSCAPS. Upon successful completion of the request, this structure is filled with address capabilities information. Prior to calling lineGetAddressCaps, the application should set the dwTotalSize member of this structure to indicate the amount of memory available to TAPI for returning information.
Returns zero if the request succeeds or a negative error number if an error occurs. Possible return values are:
LINEERR_BADDEVICEID, LINEERR_NOMEM, LINEERR_INCOMPATIBLEAPIVERSION, LINEERR_OPERATIONFAILED, LINEERR_INCOMPATIBLEEXTVERSION, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALADDRESSID, LINEERR_STRUCTURETOOSMALL, LINEERR_INVALAPPHANDLE, LINEERR_UNINITIALIZED, LINEERR_INVALPOINTER, LINEERR_OPERATIONUNAVAIL, LINEERR_NODRIVER, LINEERR_NODEVICE.
Valid address identifiers range from zero to one less than the number of addresses returned by lineGetDevCaps. The version number to be supplied is the version number that was returned as part of the line's device capabilities by lineGetDevCaps.