This message is sent when the status of an address changes on a line that is currently open by the application. The application can invoke lineGetAddressStatus to determine the current status of the address.
At a Glance
| Header file: | Tapi.h |
| Windows CE versions: | 1.0 and later |
Syntax
LINE_ADDRESSSTATE dwDevice = (DWORD) hLine;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) idAddress; dwParam2 = (DWORD) AddressState;
dwParam3 = (DWORD) 0;
Parameters
dwDevice
Specifies a handle to the line device.
dwCallbackInstance
Specifies the callback instance supplied when opening the line.
dwParam1
Specifies the address identifier of the address that changed status.
dwParam2
Specifies the address state that changed. It can be a combination of the following values:
| Value | Description |
| LINEADDRESSSTATE_OTHER | Address-status items other than those listed below have changed. The application should check the current address status to determine which items have changed. |
| LINEADDRESSSTATE_DEVSPECIFIC | The device-specific item of the address status has changed. |
| LINEADDRESSSTATE_INUSEZERO | The address has changed to idle (it is now in use by zero stations). |
| LINEADDRESSSTATE_INUSEONE | The address has changed from idle or from being used by many bridged stations to being used by just one station. |
| LINEADDRESSSTATE_INUSEMANY | The monitored or bridged address has changed from being used by one station to being used by more than one station. |
| LINEADDRESSSTATE_NUMCALLS | The number of calls on the address has changed. This is the result of events such as a new inbound call, an outbound call on the address, or a call changing its hold status. |
| LINEADDRESSSTATE_FORWARD | The forwarding status of the address has changed, including the number of rings for determining a no-answer condition. The application should check the address status to determine details about the address’s current forwarding status. |
| LINEADDRESSSTATE_TERMINALS | The terminal settings for the address have changed. |
dwParam3
Unused.
Return Values
None.
Remarks
The LINE_ADDRESSSTATE message is sent to any application that has opened the line device and that has enabled this message. The sending of this message for the various status items can be controlled and queried using lineGetStatusMessages and lineSetStatusMessages. By default, address status reporting is disabled.