Categories: Symbian C++ | Code Examples | Files/Data | S60 3rd Edition, Feature Pack 1

This page was last modified 09:38, 28 May 2008.

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Overview

This code snippet shows how to get information about schedules and scheduled tasks using the class RScheduler. The method GetScheduleRefsL() is used to get names and IDs of schedules that are defined. The filter parameter TScheduleFilter of this method can be used to get all schedules (EAllSchedules) or only pending (EPendingSchedules) schedules.

The method GetTaskRefsL() is used to get names and IDs of scheduled tasks. This method also has filter parameters TScheduleFilter and TTaskFilter. Task filters can have values to include all tasks (EAllTasks) or only those tasks that the calling client is associated with (EMyTasks).

The method GetTaskDataSize() returns the size of a given task's data member and it can be used to create a descriptor for retrieved task data. The data associated with a given task can be retrieved with the GetTaskInfoL() method.

The method GetScheduleL() is used to get all the data associated with the schedule by a given ID. There are separate methods for time-based and condition-based schedules with different parameters. Both of them are demonstrated in this example.

This snippet can be self-signed.

MMP file

The following libraries are required:

LIBRARY             schsvr.lib

Preconditions

ExampleTaskHandler.exe must be created and a time-based and a condition-based schedule with example tasks must be scheduled before this code snippet can be executed. See code snippets CS000986 - Creating and registering a task handler with RScheduler, CS000987 - Creating persistent and transient schedules with RScheduler, and CS000988 - Creating a condition-based schedule with RScheduler for more information.

Resource files

.rss

RESOURCE MENU_PANE r_schedulerexample_menu
    {
    items = 
        {
         //...
        MENU_ITEM {command = EGetInfoExample;          txt = "GetInfoExample";},
         //...
        MENU_ITEM {command = EAknSoftkeyExit;          txt = "Exit";}
        };
    }

.hrh

enum TSchedulerExampleIds
    {
  //...
    EGetInfoExample,
 //...
    };

Header file

#ifndef __SCHEDULEREXAMPLEAPPUI_H__
#define __SCHEDULEREXAMPLEAPPUI_H__
 
#include <csch_cli.h> // RScheduler
#include <schinfo.h>  // TSchedulerItemRef, TTaskInfo... 
 
class CSchedulerExampleAppUi : public CAknAppUi
    {
    //...
public:    
    void HandleCommandL(TInt aCommand);
    //...
private:        
    TInt GetConditionBasedScheduleTasksL(CArrayFixFlat<TTaskInfo>& aTaskInfoArray,
                RScheduler& aScheduler, TInt aScheduleId, TBool& aScheduleEnabled);
        
    TInt GetTimeBasedScheduleTasksL(CArrayFixFlat<TTaskInfo>& aTaskInfoArray,
                RScheduler& aScheduler, TInt aScheduleId, TBool& aScheduleEnabled);
 
    //...    
private:
 
    RScheduler iScheduler;
    
    TSchedulerItemRef iPersistentScheduleHandle;
    TSchedulerItemRef iConditionScheduleHandle;    
    };
    
#endif // __SCHEDULEREXAMPLEAPPUI_H__

Source file

void CSchedulerExampleAppUi::ConstructL()
    {
    //...
    User::LeaveIfError(iScheduler.Connect());
    
    _LIT(KExampleTaskHandlerExe, "ExampleTaskHandler.exe");
    TFileName exampleHandler(KExampleTaskHandlerExe);
        
    User::LeaveIfError(iScheduler.Register(exampleHandler, CActive::EPriorityStandard));    
    }
    
CSchedulerExampleAppUi::~CSchedulerExampleAppUi()
    {
 
    //...    
    iScheduler.Close(); 
    }    
 
void CSchedulerExampleAppUi::HandleCommandL(TInt aCommand)
  {
  TBuf<100> Text1; //first line of dialog text 
  TBuf<100> Text2; //second line of dialog text
      
  switch(aCommand)
    {
    case EEikCmdExit:
    case EAknSoftkeyExit:
      Exit();
      break;
//...
    case EGetInfoExample:
     {
     TInt err(KErrNone);
     TInt schedulerTaskCount = -1;
     TInt conditionTaskCount = -1;
     TInt timeTaskCount = -1;
     TBool timeTasksEnabled=EFalse;
     TBool conditionTasksEnabled=EFalse;
      
     CArrayFixFlat<TSchedulerItemRef>* taskItems = 
new (ELeave) CArrayFixFlat<TSchedulerItemRef>(1);
     CleanupStack::PushL(taskItems);
     
     //retrieve data about schedulers tasks       
     err = iScheduler.GetTaskRefsL(*taskItems, EAllSchedules, EAllTasks);
            
     schedulerTaskCount = taskItems->Count();
     for (TInt index=0; index < schedulerTaskCount; index++)
       {
       Text1.Zero();
       Text2.Zero();
                        
       TSchedulerItemRef item = taskItems->At(index);            
       TInt handle = item.iHandle;          
       TName name = item.iName;
                        
       Text1.Append(_L("TaskItem:"));
       Text1.AppendNum(handle);
                        
       Text2.Append(_L("Name:"));
       Text2.Append(name);
                          
       CEikonEnv::Static()->InfoWinL(Text1, Text2);
       }  
            
     CleanupStack::PopAndDestroy(taskItems);        
           
     CArrayFixFlat<TSchedulerItemRef>* schedulerItems = 
new (ELeave) CArrayFixFlat<TSchedulerItemRef>(1);
     CleanupStack::PushL(schedulerItems);
  
     //retrieve data about schedules  
     err = iScheduler.GetScheduleRefsL(*schedulerItems, EAllSchedules);
          
     TInt schedulerItemCount = schedulerItems->Count();
     for (TInt index=0; index < schedulerItemCount; index++)
       {
       Text1.Zero();
       Text2.Zero();
              
       TSchedulerItemRef item = schedulerItems->At(index);            
       TInt handle = item.iHandle;          
       TName name = item.iName;
              
       Text1.Append(_L("SchedulerItem:"));
       Text1.AppendNum(handle);
              
       Text2.Append(_L("Name:"));
       Text2.Append(name);
                
       CEikonEnv::Static()->InfoWinL(Text1, Text2);
       }
            
     CleanupStack::PopAndDestroy(schedulerItems); 
                      
     CArrayFixFlat<TTaskInfo>* timeTasks = 
new (ELeave) CArrayFixFlat<TTaskInfo>(3);
     CleanupStack::PushL(timeTasks);
     GetTimeBasedScheduleTasksL(*timeTasks, iScheduler,
 iPersistentScheduleHandle.iHandle,timeTasksEnabled);
     timeTaskCount = timeTasks->Count();
              
     for (TInt index=0; index < timeTaskCount; index++)
       {
       Text1.Zero();  
       Text2.Zero();
                 
       TTaskInfo task = timeTasks->At(index);
       TInt id = task.iTaskId;
       TName name = task.iName;
       Text1.Append(_L("TimeTask ID:"));
       Text1.AppendNum(id);
                             
       Text1.Append(_L(" Name:"));
       Text1.Append(name);
                 
       TInt taskSize = 0;
       err = iScheduler.GetTaskDataSize(task.iTaskId, taskSize);
       Text2.Append(_L("Size:"));
       Text2.AppendNum(taskSize);
                             
       HBufC* taskData = HBufC::NewLC(taskSize);
       TPtr dataPtr = taskData->Des();
                               
       TTsTime nextDue;
       TTaskInfo taskInfo;
       TSchedulerItemRef schedulerItem;
                                
       err = iScheduler.GetTaskInfoL(task.iTaskId,
                                   taskInfo, 
                                   dataPtr,
                                   schedulerItem, 
                                   nextDue);
                               
       Text2.Append(_L(" TaskData:"));
       Text2.Append(dataPtr);
                 
       CleanupStack::PopAndDestroy(taskData);
                
       CEikonEnv::Static()->InfoWinL(Text1, Text2);
       }
              
     timeTasks->Reset();
     CleanupStack::PopAndDestroy(timeTasks);
            
     CArrayFixFlat<TTaskInfo>* conditionTasks = 
new (ELeave) CArrayFixFlat<TTaskInfo>(3);
     CleanupStack::PushL(conditionTasks);
     GetConditionBasedScheduleTasksL(*conditionTasks, iScheduler,
 iConditionScheduleHandle.iHandle,conditionTasksEnabled);
     conditionTaskCount = conditionTasks->Count();
            
     for (TInt index=0; index < conditionTaskCount; index++)
       {
       //TTaskInfo task = timeTasks->At(index);
       //Do something with a task info...              
       }
            
     conditionTasks->Reset();
     CleanupStack::PopAndDestroy(conditionTasks);
     }
     
     break;      
   default:
     //Panic(ESchedulerExampleUi);
     break;
     }
  }  
    
 
//get task info array from schedule when type is EConditionSchedule
TInt CSchedulerExampleAppUi::GetConditionBasedScheduleTasksL(
                              CArrayFixFlat<TTaskInfo>& aTaskInfoArray,
                              RScheduler& aScheduler, 
                              TInt aScheduleId, 
                              TBool& aScheduleEnabled)
  {
  TInt ret(KErrNone);
  TTsTime time;
  TScheduleState2 state;
  TScheduleType type;
  
  ret = aScheduler.GetScheduleTypeL(aScheduleId, type);
   
  if(ret != KErrNone)
    {
    return ret;
    }
 
  //the given schedule id is not the one of a condition-based schedule
  if(type != EConditionSchedule)
       {
       return KErrGeneral;
       }
  
  CArrayFixFlat<TTaskSchedulerCondition>* conditions = 
new (ELeave) CArrayFixFlat<TTaskSchedulerCondition>(1);
  CleanupStack::PushL(conditions);
  
  aTaskInfoArray.Reset();
  ret = aScheduler.GetScheduleL(aScheduleId, 
                    state, 
                    *conditions, 
                    time,
                    aTaskInfoArray);
  
  aScheduleEnabled = state.Enabled();
  
  CleanupStack::PopAndDestroy(conditions);
  
  return ret;
  }
 
//get task info array from schedule when type is ETimeSchedule
TInt CSchedulerExampleAppUi::GetTimeBasedScheduleTasksL(
                              CArrayFixFlat<TTaskInfo>& aTaskInfoArray,
                              RScheduler& aScheduler, 
                              TInt aScheduleId, 
                              TBool& aScheduleEnabled)
  {
  TInt ret(KErrNone);
  TTsTime time;
  TScheduleState2 state;
  TScheduleType type;
  
  ret = aScheduler.GetScheduleTypeL(aScheduleId, type);
    
  if(ret != KErrNone)
    {
    return ret;
    }
      
  if(type != ETimeSchedule)
      {
      //the given schedule id is not the one of a time-based schedule
      return KErrGeneral;
      }
    
  CArrayFixFlat<TScheduleEntryInfo2>* entries = 
new (ELeave) CArrayFixFlat<TScheduleEntryInfo2>(1);  
  CleanupStack::PushL(entries);
  
  aTaskInfoArray.Reset();
  ret = aScheduler.GetScheduleL(aScheduleId, 
                    state, 
                    *entries, 
                    aTaskInfoArray, 
                    time);
  
  aScheduleEnabled = state.Enabled();
  
  CleanupStack::PopAndDestroy(entries);
  
  return ret;
  }

Postconditions

The IDs and names of schedules and scheduled tasks are displayed to the user with info dialogs.

See also

• CS000986 - Creating and registering a task handler with RScheduler
• CS000987 - Creating persistent and transient schedules with RScheduler
• CS000988 - Creating a condition-based schedule with RScheduler
• CS000990 - Getting schedule and task count using RScheduler
• CS000991 - Editing a schedule using RScheduler
• CS000992 - Deleting schedules and tasks using RScheduler