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LINE_GATHERDIGITS message

The TAPI LINE_GATHERDIGITS message is sent when the current buffered digit-gathering request has terminated or is canceled. The digit buffer can be examined after this message has been received by the application.



LINE_GATHERDIGITS
hDevice = (DWORD) hCall;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) GatherTermination;
dwParam2 = (DWORD) 0;
dwParam3 = (DWORD) 0;
			

Parameters

hDevice

A handle to the call.

dwCallbackInstance

The callback instance supplied when opening the line.

dwParam1

The reason why digit gathering was terminated. This parameter must be one and only one of the LINEGATHERTERM_ constants.

dwParam2

Unused.

dwParam3

The "tick count" (number of milliseconds since Windows started) at which the digit gathering completed. For TAPI versions earlier than 2.0, this parameter is unused.

Return value

No return value.

Remarks

The LINE_GATHERDIGITS message is only sent to the application that initiated the digit gathering on the call using lineGatherDigits.

If the lineGatherDigits function is used to cancel a previous request to gather digits, TAPI sends a LINE_GATHERDIGITS message with dwParam1 set to LINEGATHERTERM_CANCEL to the application indicating that the originally specified buffer contains the digits gathered up to the cancellation.

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_GENERATE, 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 provides a timestamp at the point closest to the service provider generating the event so that the synthesized timestamp is as accurate as possible.

Note  When an application invokes any asynchronous operation that writes data back into application memory, the application must keep that memory available for writing until a LINE_REPLY or LINE_GATHERDIGITS message is received.

Requirements

TAPI version

Requires TAPI 2.0 or later

Header

Tapi.h

See also

LINE_GENERATE
LINE_MONITORDIGITS
LINE_MONITORMEDIA
LINE_MONITORTONE
LINE_REPLY
lineGatherDigits

 

 

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