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LINE_MONITORDIGITS (TAPI) (Compact 2013)

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3/26/2014

This message is sent when a digit is detected. The sending of this message is controlled with the lineMonitorDigits function.

Syntax

LINE_MONITORDIGITS
    hDevice = (DWORD) hCall;
    dwCallbackInstance = (DWORD) hCallback;
    dwParam1 = (DWORD) Digit;
    dwParam2 = (DWORD) DigitMode;
    dwParam3 = (DWORD) 0;

Parameters

  • hDevice
    Handle to the call.
  • dwCallbackInstance
    Callback instance supplied when opening the call's line.
  • dwParam1
    Low-order byte contains the last digit received in a text representation.
  • dwParam2
    Digit mode that was detected. This parameter must be one and only one of the LINEDIGITMODE constants.
  • dwParam3
    Tick count (the number of milliseconds since Windows started) at which the specified digit was detected. For TAPI versions earlier than 2.0, this parameter is not used.

Return Value

None.

Remarks

The LINE_MONITORDIGITS message is sent to the application that has enabled digit monitoring.

Because this timestamp 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 (TAPI)), 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, TAPI provides a timestamp at the point closest to the service provider generating the event so that the synthesized timestamp is as accurate as possible.

Requirements

Header

tapi.h

See Also

Reference

TAPI Messages
lineMonitorDigits
LINE_GATHERDIGITS
LINE_MONITORMEDIA (TAPI)