function returns a device ID for the specified device class associated with
the selected line, address, or call.
| HLINE hLine,
| DWORD dwAddressID,
| HCALL hCall,
| DWORD dwSelect,
| LPVARSTRING lpDeviceID,
| LPCSTR lpszDeviceClass
A handle to an open line device.
An address on the given open line device.
A handle to a call.
Specifies whether the requested device ID is associated with the line, address
or a single call. The dwSelect
parameter can only have a single flag set. This parameter uses the following
Selects the specified line device. The hLine
parameter must be a valid line handle; hCall
Selects the specified address on the line. Both hLine
must be valid; hCall
Selects the specified call. hCall
must be valid; hLine
are both ignored.
A pointer to a memory location of type VARSTRING
, where the device ID is returned. Upon successful completion of the request,
this location is filled with the device ID. The format of the returned
information depends on the method used by the device class API for naming devices.
Prior to calling lineGetID
, the application should set the dwTotalSize
field of this structure to indicate the amount of memory available to TAPI
for returning information.
A pointer to a NULL-terminated ASCII string that specifies the device class of
the device whose ID is requested. Valid device class strings are those used in
the SYSTEM.INI section to identify device classes.
Returns zero if the request is successful or a negative error number if an
error has occurred. Possible return values are:
LINEERR_INVALLINEHANDLE, LINEERR_NOMEM, LINEERR_INVALADDRESSID,
LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONFAILED,
LINEERR_INVALCALLSELECT, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALPOINTER,
LINEERR_STRUCTURETOOSMALL, LINEERR_NODEVICE, LINEERR_UNINITIALIZED.
function can be used to retrieve a line-device ID when given a line handle.
This is useful after a line device has been opened using LINEMAPPER as a device
ID in order to determine the real line-device ID of the opened line. This
function can also be used to obtain the device ID of a phone device or media device
(for device classes such as COM, wave, MIDI, phone, line, or NDIS) associated
with a call, address or line. This ID can then be used with the appropriate API
(such as phone, midi, wave) to select the corresponding media device associated
with the specified call.
See Device Classes in TAPI
for device class names.
A vendor that defines a device-specific media mode also needs to define the
corresponding device-specific (proprietary) API to manage devices of the media
mode. To avoid collisions on device class names assigned independently by
different vendors, a vendor should select a name that uniquely identifies both the
vendor and, following it, the media type. For example: "intel/video".
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