a memory-leak problem

Sorry to post such a question, but I'm still wondering where is wrong
is the following code? It seems to led to a memory leak in my
program , I have checked it many times and can't find the reason yet .

any assistance will be appreciated!

/
***********************************************************************************************/
int CMainPage::DrawMyBitmap(CDC* pDC,UINT nID, CRect cRect)
{
    CDC memDC;
    CRect rcClient;
    GetClientRect(&rcClient);
    if ( !memDC.CreateCompatibleDC(pDC) )
    {
        return 0;
    }
    memDC.SetBkMode(TRANSPARENT);

    CBitmap memBmp;
    if ( !
memBmp.CreateCompatibleBitmap(pDC,rcClient.Width(),rcClient.Height()) )
    {
        memDC.DeleteDC ();
        return 0;
    }

    CBitmap *pOldmap = memDC.SelectObject(&memBmp);
    if ( !pOldmap )
    {
        memDC.DeleteDC ();
        memBmp.DeleteObject ();
        return 0;
    }

    CBitmap bmbk;
    bmbk.LoadBitmap(nID); //load bitmap for resource

    BITMAP stBitmap;
    bmbk.GetObject(sizeof(BITMAP),&stBitmap);
    CSize bmsize(stBitmap.bmWidth,stBitmap.bmHeight);
    CBitmap *pOldmap2=memDC.SelectObject(&bmbk);
    pDC->StretchBlt(cRect.left,cRect.top,bmsize.cx,bmsize.cy,&memDC,
0,0,bmsize.cx,bmsize.cy,SRCCOPY);

    memDC.SelectObject(pOldmap2);
    bmbk.DeleteObject();
    memDC.SelectObject(pOldmap);
    memBmp.DeleteObject();
    memDC.DeleteDC ();

    return 0;
}