LINE_GENERATE - Telephony API Programmer's Reference

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LINE_GENERATE

The LINE_GENERATE message is sent to notify the application that the current digit or tone generation has terminated. Only one such generation request can be in progress an a given call at any time. This message is also sent when digit or tone generation is canceled.

LINE_GENERATE
dwDevice = (DWORD) hCall;

dwCallbackInstance = (DWORD) hCallback;

dwParam1 = (DWORD) GenerateTermination;

dwParam2 = (DWORD) 0;

dwParam3 = (DWORD) 0;

Parameters
dwDevice

A handle to the call.

dwCallbackInstance

The callback instance supplied when opening the line.

dwParam1

The reason why digit or tone generation was terminated. This parameter must be one and only one of the following LINEGENERATETERM_ constants:

LINEGENERATETERM_DONE

The requested number of digits have been generated, or the requested tones have been generated for the requested duration.

LINEGENERATETERM_CANCEL

The digit or tone generation request was canceled by this application, by another application, or because the call terminated.

dwParam2

Unused.

dwParam3

The "tick count" (number of milliseconds since Windows started) at which the digit or tone generation completed. For API versions prior to 0x00020000, this parameter is unused.

Return Values
No return value.

Remarks
The LINE_GENERATE message is only sent to the application that requested the digit or tone generation.

Because the timestamp specified by dwParam3 may have been generated on a computer other than the one on which the application is executing, it is useful only for comparison to other similarly timestamped messages generated on the same line device (LINE_GATHERDIGITS, LINE_MONITORDIGITS, LINE_MONITORMEDIA, LINE_MONITORTONE), in order to determine their relative timing (separation between events). The tick count can "wrap around" after approximately 49.7 days; applications must take this into account when performing calculations.

If the service provider does not generate the timestamp (for example, if it was created using an earlier version of TAPI), then TAPI will provide a timestamp at the point closest to the service provider generating the event so that the synthesized timestamp is as accurate as possible.

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