LINE_MONITORDIGITS (TAPI)
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4/8/2010
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 |
| Windows Embedded CE | Windows CE 3.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |
See Also
Reference
lineMonitorDigits
LINE_GATHERDIGITS
LINE_MONITORMEDIA (TAPI)