phoneGetDevCaps (Compact 2013)

3/26/2014

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

Syntax

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

Parameters

• hPhoneApp
  Handle to the application's registration with TAPI.

• dwDeviceID
  Phone device to be queried.

• dwAPIVersion
  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
  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
  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 Value

Returns zero if the request succeeds or a negative error number if an error occurs. The following table shows the return values for this function.

Value	Description
PHONEERR_INVALAPPHANDLE	The handle to the application's registration with TAPI is invalid.
PHONEERR_INVALPOINTER	The pointer is invalid.
PHONEERR_BADDEVICEID	The device identifier is incorrect.
PHONEERR_OPERATIONFAILED	The operation failed.
PHONEERR_INCOMPATIBLEAPIVERSION	The API version is incompatible.
PHONEERR_OPERATIONUNAVAIL	The operation is unavailable.
PHONEERR_INCOMPATIBLEEXTVERSION	The extension version is incompatible.
PHONEERR_NOMEM	Not enough memory is available.
PHONEERR_STRUCTURETOOSMALL	The structure is too small.
PHONEERR_RESOURCEUNAVAIL	The resources are unavailable.
PHONEERR_NODRIVER	The driver was not found.
PHONEERR_UNINITIALIZED	A parameter was uninitialized.
PHONEERR_NODEVICE	The device was not found.

Remarks

Before using phoneGetDevCaps, the application must negotiate the TAPI version number to use (see phoneNegotiateAPIVersion) and, optionally, the extension version to use (see phoneNegotiateExtVersion).

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.

Requirements

Header	tapi.h
Library	TAPI32.dll

See Also

Reference

TAPI Phone Device Functions
phoneNegotiateAPIVersion
phoneNegotiateExtVersion