phoneGetDevCaps

The phoneGetDevCaps function queries a specified phone device to determine its telephony capabilities.

LONG phoneGetDevCaps(
  HPHONEAPP hPhoneApp, 
  DWORD dwDeviceID,    
  DWORD dwAPIVersion,  
  DWORD dwExtVersion,  
  LPPHONECAPS lpPhoneCaps  
);
 

Parameters

hPhoneApp

The handle to the application's registration with TAPI.

dwDeviceID

The phone device to be queried.

dwAPIVersion

The 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 with the function phoneNegotiateAPIVersion.

dwExtVersion

The version number of the service provider-specific extensions to be used. This number is obtained with the function phoneNegotiateExtVersion. It can be left zero if no device-specific extensions are to be used. Otherwise, the high-order word contains the major version number; the low-order word contains the minor version number.

lpPhoneCaps

A pointer to a variably sized structure of type PHONECAPS. Upon successful completion of the request, this structure is filled with phone device capabilities information.

Return Values

Returns zero if the request succeeds or a negative error number if an error occurs. Possible return values are:

PHONEERR_INVALAPPHANDLE, PHONEERR_INVALPOINTER, PHONEERR_BADDEVICEID, PHONEERR_OPERATIONFAILED, PHONEERR_INCOMPATIBLEAPIVERSION, PHONEERR_OPERATIONUNAVAIL, PHONEERR_INCOMPATIBLEEXTVERSION, PHONEERR_NOMEM, PHONEERR_STRUCTURETOOSMALL, PHONEERR_RESOURCEUNAVAIL, PHONEERR_NODRIVER, PHONEERR_UNINITIALIZED, PHONEERR_NODEVICE.

Remarks

Before using phoneGetDevCaps, the application must negotiate the TAPI version number to use, and optionally, the extension version to use.

TAPI and extension version numbers are those under which TAPI, Telephony DLL, and service provider must operate. If version ranges do not overlap, the application and API or service-provider versions are incompatible and an error is returned.

QuickInfo

  Version: Use TAPI version 1.4 and later.
  Header: Declared in tapi.h.
  Import Library: Link with tapi32.lib.

See Also

TAPI Reference Overview, Supplementary Phone Services Functions, PHONECAPS, phoneNegotiateAPIVersion, phoneNegotiateExtVersion