TSPI_phoneGetIcon function (tspi.h)

Article
10/05/2021

The TSPI_phoneGetIcon function retrieves a service phone device-specific (or provider-specific) icon to display to the user.

Syntax

LONG TSPIAPI TSPI_phoneGetIcon(
  DWORD   dwDeviceID,
  LPCWSTR lpszDeviceClass,
  LPHICON lphIcon
);

Parameters

dwDeviceID

The phone device whose icon is requested.

lpszDeviceClass

A pointer to a null-terminated Unicode string that identifies a device class name. This device class allows the caller to select a specific sub icon applicable to that device class. This parameter is optional and can be left NULL or be empty, in which case the highest level icon associated with the phone device rather than a specified media stream device is selected.

lphIcon

A pointer to a memory location in which the handle to the icon is returned.

Return value

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

PHONEERR_INVALDEVICECLASS, PHONEERR_OPERATIONFAILED, PHONEERR_NOMEM, PHONEERR_OPERATIONUNAVAIL, PHONEERR_RESOURCEUNAVAIL.

Remarks

TSPI_phoneGetIcon causes the provider to return a handle (in the DWORD pointed to by lphIcon) to an icon resource (obtained from the
LoadIcon function) associated with the specified phone. The icon handle is for a resource associated with the provider.

The lpszDeviceClass parameter allows the provider to return different icons based on the type of service being referenced by the caller. The permitted strings are the same as for TSPI_phoneGetID. For example, if the phone supports the Comm API, passing comm/datamodem as lpszDeviceClass causes the provider to return an icon related specifically to the Comm device functions of the service provider. For more information about common device classes, see TSPI Device Classes.

The parameters "tapi/phone", "", or NULL can be used to request the icon for the phone device. A provider can choose to support many icons (selected by lpszDeviceClass and/or phone number), a single icon (such as for the manufacturer, which would be returned for all phoneGetIcon requests regardless of the lpszDeviceClass selected), or no icons, in which case it sets the DWORD pointed to by lphIcon to NULL. TAPI examines the handle returned by the provider, and if the provider returns NULL, TAPI substitutes a generic Telephony icon included as a resource in TAPI (the generic phone icon).

If the service provider supports no icons, it can leave this function unimplemented, in which case TAPI provides a generic phone icon for the application.

Requirements

Requirement	Value
Target Platform	Windows
Header	tspi.h