TAPI sends messages to an application through a callback function implemented by the application. Implement the callback function according to the following definition.
void CALLBACK LineCallbackFunc (DWORD hDevice, DWORD dwMsg, DWORD wCallbackInstance, DWORD dwParam1, DWORD dwParam2, DWORD dwParam3);
| Message | Description |
|---|---|
| LINE_ADDRESSSTATE | Indicates that the status of an address on a currently open line has changed |
| LINE_CALLINFO | Indicates that call information has changed |
| LINE_CALLSTATE | Indicates that the status of the call has changed |
| LINE_CLOSE | Indicates that the line device has been forcibly closed |
| LINE_CREATE | Indicates that a new line device has been created |
| LINE_DEVSPECIFIC | Indicates that a device-specific event has occurred |
| LINE_LINEDEVSTATE | Indicates that the state of a line device has changed |
| LINE_REMOVE | Indicates that a device has been removed, usually for good |
| LINE_REPLY | Reports the results of function calls that completed asynchronously |
| LINE_REQUEST | Reports the arrival of a new request from another application |