phoneOpen - Telephony API Programmer's Reference

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phoneOpen

The phoneOpen function opens the specified phone device. A phone device can be opened using either owner privilege or monitor privilege. An application that opens the phone with owner privilege can control the phone's lamps, display, ringer, and hookswitch or hookswitches. An application that opens the phone device with monitor privilege is notified only about events that occur at the phone, such as hookswitch changes or button presses. Ownership of a phone device is exclusive. In other words, only one application can have a phone device opened with owner privilege at a time. The phone device can, however, be opened multiple times with monitor privilege.

LONG phoneOpen(

HPHONEAPP hPhoneApp,
DWORD dwDeviceID,
LPHPHONE lphPhone,
DWORD dwAPIVersion,
DWORD dwExtVersion,
DWORD dwCallbackInstance,
DWORD dwPrivilege
);

Parameters
hPhoneApp

A handle to the application's registration with TAPI.

dwDeviceID

The phone device to be opened.

lphPhone

A pointer to an HPHONE handle, which identifies the open phone device. Use this handle to identify the device when invoking other phone control functions.

dwAPIVersion

The API version number under which the application and Telephony API have agreed to operate. This number is obtained from phoneNegotiateAPIVersion.

dwExtVersion

The extension version number under which the application and the service provider agree to operate. This number is zero if the application does not use any extensions. This number is obtained from phoneNegotiateExtVersion.

dwCallbackInstance

User instance data passed back to the application with each message. This parameter is not interpreted by the Telephony API.

dwPrivilege

The privilege requested. The dwPrivilege parameter can have only one bit set. This parameter uses the following PHONEPRIVILEGE_ constants:

PHONEPRIVILEGE_MONITOR

An application that opens a phone device with this privilege is informed about events and state changes occurring on the phone. The application cannot invoke any operations on the phone device that would change its state.

PHONEPRIVILEGE_OWNER

An application that opens a phone device in this mode is allowed to change the state of the lamps, ringer, display, and hookswitch devices of the phone. Having owner privilege to a phone device automatically includes monitor privilege as well.

Return Values
Returns zero if the request is successful or a negative error number if an error has occurred. Possible return values are:

PHONEERR_ALLOCATED, PHONEERR_NODRIVER, PHONEERR_BADDEVICEID, PHONEERR_NOMEM, PHONEERR_INCOMPATIBLEAPIVERSION, PHONEERR_OPERATIONFAILED, PHONEERR_INCOMPATIBLEEXTVERSION, PHONEERR_OPERATIONUNAVAIL, PHONEERR_INVALAPPHANDLE, PHONEERR_RESOURCEUNAVAIL, PHONEERR_INVALPOINTER, PHONEERR_UNINITIALIZED, PHONEERR_INVALPRIVILEGE, PHONEERR_REINIT, PHONEERR_INUSE, PHONEERR_NODEVICE, PHONEERR_INIFILECORRUPT.

Remarks
When opening a phone device with monitor privileges, the application is sent messages when events occur that change the status of the phone. Messages sent to the application include PHONE_BUTTON and PHONE_STATE. The latter provides an indication of the phone's status item that has changed.

When opening a phone with owner privilege, the phone device can be manipulated in ways that affect the state of the phone device. An application should only open a phone using owner privilege if it actively wants to manipulate the phone device, and it should close the phone device when done to allow other applications to control the phone.

When an application opens a phone device, it must specify the negotiated API version and, if it wants to use the phone's extensions, the phone's device-specific extension version. This version number should have been obtained with the function phoneNegotiateAPIVersion and phoneNegotiateExtVersion. Version numbering allows the mix and match of different application versions with different API versions and service-provider versions.

See Also
PHONE_BUTTON, PHONE_STATE, phoneNegotiateAPIVersion, phoneNegotiateExtVersion

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