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LINE_MONITORDIGITS
The LINE_MONITORDIGITS message is sent when a digit is detected. The sending
of this message is controlled with the lineMonitorDigits function.
LINE_MONITORDIGITS
dwDevice = (DWORD) hCall;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) Digit;
dwParam2 = (DWORD) DigitMode;
dwParam3 = (DWORD) 0;
Parameters
dwDevice
A handle to the call.
dwCallbackInstance
The callback instance supplied when opening the call's line.
dwParam1
The low-order byte contains the last digit received in ASCII.
dwParam2
The digit mode that was detected. This parameter must be one and only one of
the following LINEDIGITMODE_ constants:
LINEDIGITMODE_PULSE
Detect digits as audible clicks that are the result of rotary pulse sequences.
Valid digits for pulse are '0' through '9'.
LINEDIGITMODE_DTMF
Detect digits as DTMF tones. Valid digits for DTMF are '0' through '9', 'A',
'B', 'C', 'D', '*', and '#'.
LINEDIGITMODE_DTMFEND
Detect and provide application notification of DTMF down edges. Valid digits
for DTMF are '0' through '9', 'A', 'B', 'C', 'D', '*', and '#'.
dwParam3
The "tick count" (number of milliseconds since Windows started) at which the
specified digit was detected. For API versions prior to 0x00020000, this
parameter is unused.
Return Values
No return value.
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_GENERATE, 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.
See Also
LINE_GATHERDIGITS, LINE_GENERATE, LINE_MONITORMEDIA, LINE_MONITORTONE, lineMonitorDigits
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