C / C++ / MFC

class CMyData
{
  protected:
    long m_lMyVar;

  public:
    long GetMyVar();
    void SetMyVar(long lVal);

    HANDLE m_hEvent;

    CMyData();
}

CMyData::CMyData()
{
  m_hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);

long CMyData::GetMyVar()
{ 
  return m_lMyVar;
}

void CMyData::SetMyVar(long lVal)
{
   m_lMyVar = lVal;
   // set the event
   SetEvent(m_hEvent);
}


.... then later on ....

if (WaitForSingleObject(mydataobj.m_hEvent, INFINITE) == WAIT_OBJECT_0)
{
   // do your stuff
}

<br />
lError = AdsSyncAddDeviceNotificationReq(m_pAddr, this->m_iGrupADSTCAT, (iComptador * this->m_iBytesElementADSTCAT) + this->m_iOffsetInicialADSTCAT, &this->m_ArrDadesADSCallback[iComptador].m_adsNotificationAttrib, this->CallbackFX1, this->m_ArrDadesADSCallback[iComptador].m_hUser, &this->m_ArrDadesADSCallback[iComptador].m_hNotification);<br />

<br />
void CMonitor::CallbackFX1(AmsAddr *pAddr, AdsNotificationHeader *pNotification, ULONG hUser)<br />
{<br />
	printf("hUser: %.2u  >>  Contingut: %.10u\n",hUser, *(ULONG *)pNotification->data);<br />
}<br />

MFC:
void CMXAutoDlg::SendStringToWnd ( CWnd * pWnd , CString sString )
{

	pWnd->SetForegroundWindow() ;
	pWnd->SetFocus();
	pWnd->CenterWindow ( ) ;

	
	for ( int iCounter = 0 ; iCounter < sString.GetLength ( ) ; iCounter ++)
	{
		pWnd->PostMessage ( WM_CHAR, sString [ iCounter ] , 0 );
		Sleep ( 100 );

	}
}
Non MFC:
PostMessage(hWnd , ...) same params

BOOL GetMessage(
  LPMSG lpMsg,         // message information
  HWND hWnd,           // handle to window
  UINT wMsgFilterMin,  // first message
  UINT wMsgFilterMax   // last message
);

 <br />
   ...<br />
   	MSG msg;<br />
	while(::GetMessage(&msg, NULL, 0,0))<br />
	{<br />
		switch(msg.message)<br />
		{<br />
		case WM_RXD_ARRIVAL:<br />
			AfxMessageBox(msg.lParam);<br />
			break;<br />
		default:<br />
			break;<br />
<br />
		};<br />
	};<br />
   ...<br />

MSG msg;
while(::GetMessage(&msg, NULL, 0,0))
{
  switch(msg.message)
  {
   case WM_RXD_ARRIVAL:
     // cast them
     BYTE* m_pByte = (BYTE *) msg.wParam; 
     int m_nLen = (int) msg.lParam;

     break;

   default:
     break;
  }
}

#pragma message("this is just how to do it")