Knowledge Base Nr: 00316 gdileaks.cpp - http://www.swe-kaiser.de

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win32/mfc: detect gdi resource leaks

  
class DbgGuiLeak
{
public:
    explicit DbgGuiLeak(const CString sComment)
    {
        m_sComment = sComment;
        m_nGuiResCount = ::GetGuiResources (::GetCurrentProcess(), GR_GDIOBJECTS);
    }
    ~DbgGuiLeak()
    {
        int nLeaksGDI = ::GetGuiResources (::GetCurrentProcess(), GR_GDIOBJECTS) - m_nGuiResCount;
        if (nLeaksGDI != 0)
        {
            TRACE("###> Gui Resources Leaked (%ws): %d\n", m_sComment, nLeaksGDI);
            ASSERT(FALSE);
        }
    }
private:
    CString m_sComment;
    unsigned m_nGuiResCount;
};

#### erstes beispiel

DbgGuiLeak* g_pLeakDetect;

CscrollviewView::CscrollviewView()
{
    g_pLeakDetect = new DbgGuiLeak(L"CscrollviewView");
}

CscrollviewView::~CscrollviewView()
{
    delete g_pLeakDetect;
}


#### zweites beispiel

void CgditestView::OnDraw(CDC* /*pDC*/)
{
    DbgGuiLeak(L"OnDraw");

    CgditestDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    if (!pDoc)
        return;

  // TODO: Code zum Zeichnen der systemeigenen Daten hinzufügen
}