function allows an application to determine whether or not it is in the
handoff priority list for a particular media mode or Assisted Telephony request
mode, and, if so, its position in the priority list.
| LPCSTR lpszAppFilename,
| DWORD dwMediaMode,
| LPLINEEXTENSIONID const lpExtensionID,
| DWORD dwRequestMode,
| LPVARSTRING lpExtensionName,
| LPDWORD lpdwPriority
A pointer to a string containing the application executable module filename
(without directory information). In API versions 0x00020000 and greater, the
parameter can be in either long or 8.3 filename format. In API versions less than
0x00020000, the parameter must specify a filename in the 8.3 format; long
filenames cannot be used.
The media mode for which the priority information is to be obtained. The value
may be one of the LINEMEDIAMODE_ constants; only a single bit may be on. The
value 0 should be used if checking application priority for Assisted Telephony
A pointer to structure of type LINEEXTENSIONID
. This parameter is ignored.
If the dwMediaMode
parameter is 0, this parameter specifies the Assisted Telephony request mode
for which priority is to be checked. It must be either LINEREQUESTMODE_MAKECALL
or LINEREQUESTMODE_MEDIACALL. This parameter is ignored if dwMediaMode
This parameter is ignored.
A pointer to a DWORD-size memory location into which TAPI will write the
priority of the application for the specified media or request mode. The value 0
will be returned if the application is not in the stored priority list and does
not currently have any line device open with ownership requested of the specified
media mode or having registered for the specified request mode.
In API versions less than 0x00020000, the value
1 (0xFFFFFFFF) is returned if the application has the line open for the
specified media mode or has registered for the specified requests, but the
application is not in the stored priority list (that is, it is in the temporary priority
list only). In API versions 0x00020000 and greater, the value 0 is returned to
indicate this condition.
Otherwise, the value will indicate the application's position in the list
(with 1 being highest priority, and increasing values indicating decreasing
Returns zero if the request is successful or a negative error number if an
error has occurred. Possible return values are:
LINEERR_INIFILECORRUPT, LINEERR_INVALREQUESTMODE, LINEERR_INVALAPPNAME,
LINEERR_NOMEM, LINEERR_INVALMEDIAMODE, LINEERR_OPERATIONFAILED, LINEERR_INVALPOINTER,
If LINEERR_INVALMEDIAMODE is returned, the value specified in dwMediaMode
is not 0, not a valid extended media mode, and not a LINEMEDIAMODE_ constant,
or more than one bit is on in the parameter value.
Also, long filenames are now permitted for lpszAppFilename
; 8.3 names are acceptable, but no longer required.
Although this is a new function which older applications would not be expected
to call, for backward compatibility, they should not be prevented from doing
so; the function will work the same way for all applications.
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