Using the LINECALLINFO Data Structure
structure stores a large amount of information about a call, and is thus an
important source of data. Generally, a logging application reads from LINECALLINFO
and write this information into its log file.
A separate LINECALLINFO
structure exists for every inbound and outbound call. Information in this
structure is obtained by an application with lineGetCallInfo
. An application typically reads the information from LINECALLINFO
at the following times:
- When the application first receives a handle for a call in the LINE_CALLSTATE message.
- Each time the application receives notification in a LINE_CALLINFO message that LINECALLINFO has changed. Whenever any part of the structure
changes, a LINE_CALLINFO message is sent to the application indicating which
information item has changed.
Both the LINE_CALLSTATE message and the LINE_CALLINFO message also supply the
call's handle as a parameter.
Much of the information held in LINECALLINFO
remains fixed for the duration of the call. Information about a call that
changes dynamically, such as call progress status, is available in the LINECALLSTATUS
structure, which is returned with the function call lineGetCallStatus
. Other information needed by logging applications that is not stored in LINECALLINFO
is call start time, call stop time, and the call's duration, which it
determines by checking the system time when the corresponding LINE_CALLSTATE
messages are received.
stays intact after the call is disconnected, so the logging application can
later read it in order to write additional information into the log. LINECALLINFO
remains available only until the last application that had a handle for the
call (owner and monitor handles) deallocates its handle.
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