function returns a device ID for the given device class associated with the
specified phone device.
| HPHONE hPhone,
| LPVARSTRING lpDeviceID,
| LPCSTR lpszDeviceClass
A handle to an open phone device.
A pointer to a data structure 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.
A pointer to a NULL-terminated 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:
PHONEERR_INVALPHONEHANDLE, PHONEERR_NOMEM, PHONEERR_INVALPOINTER,
PHONEERR_RESOURCEUNAVAIL, PHONEERR_INVALDEVICECLASS, PHONEERR_UNINITIALIZED,
PHONEERR_OPERATIONFAILED, PHONEERR_STRUCTURETOOSMALL, PHONEERR_OPERATIONUNAVAIL.
function can be used to retrieve a phone device ID given a phone handle. It
can also be used to obtain the device ID of the media device (for device classes
such as COM, wave, MIDI, phone, line, or NDIS) associated with the opened
phone device. The names of these device class are not case sensitive. This ID can
then be used with the appropriate media API to select the corresponding device.
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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