lineGetAppPriority function (tapi.h)
The lineGetAppPriority function enables 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.
Syntax
LONG lineGetAppPriority(
LPCSTR lpszAppFilename,
DWORD dwMediaMode,
LPLINEEXTENSIONID lpExtensionID,
DWORD dwRequestMode,
LPVARSTRING lpExtensionName,
LPDWORD lpdwPriority
);
Parameters
lpszAppFilename
A pointer to a string that contains the application executable module file name, without directory data. In API version 2.0 or later, the parameter can be in long file name format, of which the 8.3 file name format is a proper subset. Long file names, unlike 8.3 file names, are case preserving. Neither file name format is case sensitive. For more information, see File Name Conventions. In API versions earlier than 2.0, the parameter must specify a file name in the 8.3 format; long file names cannot be used.
dwMediaMode
A media mode for which the priority data is to be obtained. The value can be one of the LINEMEDIAMODE_ Constants; only a single bit can be on. The value 0 should be used if verifying application priority for Assisted Telephony requests.
lpExtensionID
A pointer to structure of type LINEEXTENSIONID. This parameter is ignored.
dwRequestMode
The conditions for this parameter are, if the dwMediaMode parameter is zero, this parameter specifies the Assisted Telephony request mode for which priority is to be checked. It must be LINEREQUESTMODE_MAKECALL. This parameter is ignored if dwMediaMode is non-zero.
lpExtensionName
This parameter is ignored.
lpdwPriority
A pointer to a DWORD-size memory location into which TAPI writes the priority of the application for the specified media or request mode. The value 0 is 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 earlier than 2.0, 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 version 2.0 or later, the value 0 is returned to indicate this condition.
Otherwise, the value indicates the application position in the list; 1 being highest priority, and increasing values indicating decreasing priority.
Return value
Returns zero if the request succeeds or a negative error number if an error occurs. Possible return values are:
LINEERR_INIFILECORRUPT, LINEERR_INVALREQUESTMODE, LINEERR_INVALAPPNAME, LINEERR_NOMEM, LINEERR_INVALMEDIAMODE, LINEERR_OPERATIONFAILED, LINEERR_INVALPOINTER, LINEERR_STRUCTURETOOSMALL.
Remarks
If LINEERR_INVALMEDIAMODE is returned, the value specified in dwMediaMode is not zero, not a valid extended media mode, and not one of the LINEMEDIAMODE_ Constants, or more than one bit is on in the parameter value.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | tapi.h |
| Library | Tapi32.lib |
| DLL | Tapi32.dll |