Performance Statistics Class

If you want to use CPerfStats class you should create own class derived from CPerfStats.

class MyPerfStats : public CPerfStats  
{
public:
 MyPerfStats();
 virtual ~MyPerfStats();
 void OnHitCategory( CATEGORY_STRUCT * pCategory );
 void OnHitElement( ELEMENT_STRUCT * pElement );
}

Now, you can create MyPerfStats object and call EnumCategories().

MyPerfStats perf;
perf.EnumCategories();

void MyPerfStats::OnHitCategory( CATEGORY_STRUCT * pCategory )
{
 pCategoryList->SetItemData( pCategoryList->AddString( pCategory->Name), (DWORD)pCategory ) ;
}

Now, you can enumerating elements of categories. I wrote something like this.

void CPerfTestDlg::OnSelchangeListCategories() 
{
 m_ElementsList.ResetContent();
 perf.EnumElements( (CATEGORY_STRUCT *)m_CategoriesList.GetItemData( m_CategoriesList.GetCurSel() ) );	
}

void MyPerfStats::OnHitElement( ELEMENT_STRUCT * pElement )
{
 pElementList->SetItemData( pElementList->AddString( pElement->Name), (DWORD)pElement );
}

You can take element description...

void CPerfTestDlg::OnSelchangeListElements() 
{
 ELEMENT_STRUCT * pElement = (ELEMENT_STRUCT *)m_ElementsList.GetItemData( m_ElementsList.GetCurSel() );
 SetDlgItemText(IDC_STATIC_DESCRIPTION, pElement->Description);
}

void CPerfTestDlg::OnTimer(UINT nIDEvent) 
{
 if ( m_ElementsList.GetCurSel() !=  LB_ERR ) 
 {
  ELEMENT_STRUCT * pElement = (ELEMENT_STRUCT *)m_ElementsList.GetItemData( m_ElementsList.GetCurSel() );
  DWORD value = perf.GetValue(pElement);
  if ( pElement->Differentiate   == FALSE )
  {
   SetDlgItemInt(IDC_STATIC_VALUE, value);
  }else
  {
   SetDlgItemInt(IDC_STATIC_VALUE, (value - LastValue) / 1); // 1 couse interval = 1000 ms = 1 s
   LastValue = value;
  }
 }else
 {
  SetDlgItemText(IDC_STATIC_VALUE, "");
 }
 CDialog::OnTimer(nIDEvent);
}

This flag indicates whether the statistic being collected is cumulative or not. If Differentiate is True, then the statistic is steadily increasing, and the value reported should be the difference between successive values divided by the interval expressed in seconds. If Differentiate is False, then the statistic should be reported unchanged.

Download demo project - 34 KB

Download source - 3 KB

Date Last Updated: April 4, 1999