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Displaying Log Events

This tutorial describes how to display log events.

You create a view to be displayed in the viewer application by creating a CLogViewEvent or a CLogViewRecent. Both classes select entries from the log, usually subject to the constraint of a filter.

CLogViewEvent and CLogViewRecent inherit functions from CLogView which let you navigate through the items in the view:

Create a CLogViewEvent or a CLogViewRecent class
Set a filter for the logs
```
    iLogViewEvent->SetFilterL(*iLogFilter,iStatus)
```
A CLogViewRecent has additional functionality to identify and filter out duplicate events. A view is a purely virtual table and its add and delete functions have no effect on the log itself.
Create a view from the Log Engine using Event() A view is a list of events ordered chronologically, earliest first. A view always has a current event, which you retrieve with Event(). When you create a view the current event is the first event, and you navigate through the list using the other functions which take a TRequestStatus as argument.
1. To get the first event in the view call
```
if(CViewEvent.FirstL(aStatus))
  {
  User::WaitForRequest(aStatus); 
  CLogEvent e = iViewEvent.Event(); 
  }
```
2. To get the last event in the view call
```
if(CViewEvent.LastL(aStatus))
  {
  User::WaitForRequest(aStatus); 
  CLogEvent e = iViewEvent.Event(); 
  };
```
3. To get the last event in the view call
```
if(CViewEvent.FirstL(aStatus))
  {
  User::WaitForRequest(aStatus); 
  CLogEvent e = iViewEvent.Event(); 
  }
```
4. and then inside a loop call
```
while(CViewEvent.NextL(aStatus))
  {
  User::WaitForRequest(aStatus); 
  CLogEvent e = iViewEvent.Event(); 
  }
```
The view can be displayed to the user.

A recent view is similar to an event view but is designed specifically for the purpose of displaying such recent events as the distinct voice calls a device user has received since the last time of checking. In a recent view, the first event is the most recent.

Parent topic: Log Engine Tutorials

Related concepts

Setting Up A Log Engine Client

Related tasks

Maintaining Log Events

Requesting Log Engine Notifications

Configuring Log Engine