TSPI_phoneGetDevCaps

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

LONG TSPI_phoneGetDevCaps(
  DWORD dwDeviceID,    
  DWORD dwTSPIVersion, 
  DWORD dwExtVersion,  
  LPPHONECAPS lpPhoneCaps  
);
 

Parameters

dwDeviceID

The phone device to be queried.

dwTSPIVersion

The negotiated TSPI version number. This value is negotiated for this device through the TSPI_phoneNegotiateTSPIVersion function.

dwExtVersion

The negotiated extension version number. This value is negotiated for this device through the TSPI_phoneNegotiateExtVersion function.

lpPhoneCaps

A pointer to memory into which the service provider writes a variably sized structure of type PHONECAPS. Upon successful completion of the request, this structure is filled with phone device capability information. Prior to calling TSPI_phoneGetDevCaps, the application sets the dwTotalSize member of this structure to indicate the amount of memory available to TAPI for returning information.

Return Values

Returns zero if the function succeeds, or an error number if an error occurs. Possible return values are as follows:

PHONEERR_INCOMPATIBLEAPIVERSION, PHONEERR_RESOURCEUNAVAIL, PHONEERR_INCOMPATIBLEEXTVERSION, PHONEERR_OPERATIONFAILED, PHONEERR_NODRIVER, PHONEERR_OPERATIONUNAVAIL, PHONEERR_NOMEM.

Remarks

The service provider fills in all the members of the PHONEBUTTONINFO data structure, except for dwTotalSize, which is filled in by TAPI. The service provider must not overwrite the dwTotalSize member.

If dwExtVersion is zero, no extension information is requested. If it is nonzero, it holds a value that has already been negotiated for this device with the TSPI_phoneNegotiateExtVersion function. The service provider fills in device- and vendor-specific extended information according to the extension version specified.

After the service provider returns from the TSPI_phoneGetDevCaps function, TAPI sets the dwPhoneStates member of the PHONECAPS structure as follows:

PHONECAPS.dwPhoneStates |=
    PHONESTATE_OWNER |
    PHONESTATE_MONITORS |
    PHONESTATE_REINIT;
 

See Also

PHONEBUTTONINFO, PHONECAPS, TSPI_phoneNegotiateExtVersion