Categories: Symbian C++ | Technical Solution | S60 3rd Edition | Base/System | Imaging | Code Examples

This page was last modified 11:53, 15 February 2008.

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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 <agptask.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;
   }