From Forum Nokia Wiki

ID	CS000815	Creation date	February 8, 2008
Platform	S60 3rd Edition	Tested on devices
Category	Symbian C++	Subcategory	Imaging, Application Framework

Keywords (APIs, classes, methods, functions):

Description

In order to find out whether the Camera application is running, TApaTaskList class can be used to retrieve a list of currently running tasks.

Note that on some devices, such as the Nokia N93 and the Nokia N93i, the Camera task is always running in the background and only hidden from the list of active task when in background.

Solution

The following function returns ETrue if the Camera is running and not hidden from the list of active tasks.

Capability requirements: none

#include <apgtask.h>      // link against apgrfx.lib
  #include <apgwgnam.h>
 
  // The UID of the native camera application
  const TUid KNativeCameraAppUID = { 0x101ffa86 }; 
 
  TBool CheckCameraStatusL()
    {
    TUid id( KNativeCameraAppUID );
    TApaTaskList taskList( iWsSession ); // iWsSession is of type RWsSession
    TApaTask task = taskList.FindApp( id );
 
    if( task.Exists() )
      {
      CApaWindowGroupName* wgName = 
        CApaWindowGroupName::NewLC( iWsSession, task.WgId() );
 
      TBool isHidden = wgName->Hidden();
      CleanupStack::PopAndDestroy(); // wgName
 
      if(!isHidden)
        {
        return ETrue;
        }
      }
    return EFalse;
    }