C / C++ / MFC

Erudite_Eric wrote:

Dont you have to do the initialisation in the class constructor?

/**
 * check if a given value is within the range
 * @return -1 if the value is too low, 0 if the value is in range, 1 if the value is too high
 * @param  value  the value you want to check
 */
int inVersionRange(char value);

const char Min_Version = -5;
const char max_version = 1;

int inVersionRange(char value) {
   int result = 0;
   if (value < Min_Version)
      result = -1;
   if (value > Max_Version)
      result = 1;
   return result;
}

struct VersionRange {
   static const char VMIN;
   static const char VMAX;
};
// initialize in implementation file like this:
const char VersionRange::VMIN = -5;
const char VersionRange::VMAX = 1;

// header file
class VersionBoundary {
   static const char* const boundaries;
public:
   static const char& VMIN;
   static const char& VMAX;
}
// implementation file
const char* const VersionBoundary::boundaries = { -5, 1 };
const char& VersionBoundary::VMIN = *(boundaries+0); // reference to first value
const char& VersionBoundary::VMAX = *(boundaries+1); // reference to second value

// this is where the tooltip text is set
sprintf_s(pGetInfoTip->pszText, pGetInfoTip->cchTextMax, "Some helpful tooltip");

LRESULT CMainFrame::OnGetTabToolTip(WPARAM wp, LPARAM lp)
{
	CMFCTabToolTipInfo* pInfo = (CMFCTabToolTipInfo*) lp;
	ASSERT (pInfo != NULL);
 
	if (pInfo)
	{
		ASSERT_VALID (pInfo->m_pTabWnd);
		if (!pInfo->m_pTabWnd->IsMDITab ())
		{
			return 0;
		}
 
		CWnd *pwnd = pInfo->m_pTabWnd->GetTabWnd(pInfo->m_nTabIndex);
                // CMyDoc *pDoc = get document from pwnd using pInfo->m_nTabIndex somehow ???
		pInfo->m_strText = pDoc->GetTabTipString();
	}
 
	return 0;
}

// Resize the list control contained in the view to
// fill the entire view when the view's window is
// resized. CMyView is a CView derived class.
void CMyView::OnSize(UINT nType, int cx, int cy)
{
   CView::OnSize(nType, cx, cy);
   // Resize list to fill the whole view.
   m_List.MoveWindow (0, 0, cx, cy);
}

CWnd* GetDlgItem(
   int nID
) const;

Carl Cioffi wrote:

Exactly what does this line of code do and why would it be needed in a windows service?

Carl Cioffi wrote:

I don't really see it as a valid race condition.

void InitDebit() {

   int  rc;

   Log(DEBUG_ALWAYS,"Initializing US Debit");

   // Create and open the debit semaphore
   rc = DosCreateMutexSem(FingerPrintSemaphoreName,&FingerPrintSemaphoreHandle,0,0);

   if (rc) {
      Log(DEBUG_ERROR,"FingerPrint DosCreateMutexSem %d",rc);
   }

}  // end InitDebit