C / C++ / MFC

void CCommunicationView::OnCustomDrawLog(NMHDR* pNMHDR, LRESULT* pResult)
{
	NMLVCUSTOMDRAW *pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>(pNMHDR);
	
	*pResult = CDRF_DODEFAULT;			// assume normal windows drawn control
	
	if (CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage)
	{
		*pResult = CDRF_NOTIFYITEMDRAW;
	}
	else if (CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage)
	{
		// this is the prepaint stage, we need each sub-item pre-paint
		*pResult = CDRF_NOTIFYSUBITEMDRAW;
	}
	else if ((CDDS_ITEMPREPAINT | CDDS_SUBITEM) == pLVCD->nmcd.dwDrawStage)
	{
		// now render the image if it has one
		int		item = pLVCD->nmcd.dwItemSpec;
		LVITEM rItem;
        ZeroMemory(&rItem, sizeof(LVITEM));
        rItem.mask = LVIF_IMAGE | LVIF_STATE;
        rItem.iItem = item;
        rItem.stateMask = LVIS_SELECTED;
        m_Log.GetItem(&rItem );
		// we render the text ourselves in the right colour and take tabs into account
		int		value = m_Log.GetItemData(item);
		CDC*	pDC = CDC::FromHandle ( pLVCD->nmcd.hdc );
		CRect	rcText;
		CRect	rcIcon;
		CString	text;
		
		m_Log.GetItemRect(item, &rcIcon, LVIR_ICON);
		m_Log.GetItemRect(item, &rcText, LVIR_BOUNDS);
		rcText.left += rcIcon.Width();

		text = m_Log.GetItemText(item, 0);
		if (rItem.state & LVIS_SELECTED)
		{
			pDC->SetTextColor(GetSysColor(COLOR_HIGHLIGHTTEXT));
			CBrush	brush(GetSysColor(COLOR_HIGHLIGHT));
			pDC->FillRect(rcText, &brush);
		}
		else
		{
			pDC->SetTextColor(value);
			CBrush	brush(GetSysColor(COLOR_HIGHLIGHTTEXT));
			pDC->FillRect(rcText, &brush);
		}
		pDC->DrawText(text, rcText, DT_END_ELLIPSIS | DT_EXPANDTABS | DT_SINGLELINE | DT_VCENTER);
		pLVCD->clrText = value;
		m_ilLog.Draw(pDC, rItem.iImage, rcIcon.TopLeft(), ILD_TRANSPARENT);
		*pResult = CDRF_SKIPDEFAULT;
	}
}

int global_int;<br />
...<br />
<br />
void CDialogA::OnOk()<br />
{<br />
...<br />
global_int=5;<br />
...<br />
}

extern int global_int;<br />
...<br />
void CDialogB::OnQuestion()<br />
{<br />
...<br />
int number=global_int;<br />
...<br />
}

<br />
int global_int;<br />
...<br />
<br />
void CDialogA::OnOk()<br />
{<br />
...<br />
global_int=5;<br />
...<br />
}

<br />
extern int global_int;<br />
...<br />
void CDialogB::OnQuestion()<br />
{<br />
...<br />
int number=global_int;<br />
...<br />
}

header file of the application
class CTCCApp : public CWinApp
{
public:
  CTCCApp();
  ...

private:
  int theIntegerVarToBeAccessed;

public:
  int GetTheIntegerValue();
  void SetTheIntegerValue(int iValue);

implementation file of the application
/*---------------------------------------------
COMMENTS FIRST
1. Initialize your variable at the application's constructor or in initinstance...
2. You'll be able to see that somewhere near top the implementation file there's a line like this one:
CTCCApp TCCApp; (You should substitute "TCC" for your text string) This is your app....
---------------------------------------------*/

// Now the functions that you use to access the number...
// SETTING THE VALUE:
void CTCCApp::SetTheIntegerValue(int iValue)
{
  // Process the value and make whatever you want with it before setting it to your integer variable...
  theIntegerVarToBeAccessed = iValue;
}

// GETTING THE VALUE:
int CTCCApp::GetIntegerValue()
{
  return theIntegerVarToBeAccessed;
}

Where you need to access that integer (let's say WHERE.cpp)
/*---------------------------------------------
COMMENTS FIRST
Be sure that you have a #include "TCCApp.h"; in your header or in your implementation file.
---------------------------------------------*/
//Inside the function where you want to access that:
extern CTCCApp TCCApp;
// Now you can get:
TCCApp.GetIntegerValue();
TCCApp.SetIntegerValue(10);