谁可以帮我瞧瞧两个函数中DC释放的错误？急
有两个要求:
在所有GetDC()和ReleaseDC()的地方，用CClientDC
在所有CreateXXXDC和DeleteDC的地方，用CDC。
求大神帮忙修改，分数都给大家了

void Shadow::DrawSemiTransparentRect(CDC *pDstDC, CRect rtTran, COLORREF clrSrc)
{
    int nSavedDC = pDstDC->SaveDC();

    int nWidth = rtTran.Width();
    int nHeight = rtTran.Height();

    CDC bmpDC;
    bmpDC.CreateCompatibleDC(pDstDC);
    CBitmap bmp;

    bmp.CreateCompatibleBitmap(pDstDC, nWidth, nHeight);
    CBitmap* pOldBmp = (CBitmap*)bmpDC.SelectObject(&bmp);
    bmpDC.BitBlt(0, 0, nWidth, nHeight, pDstDC, rtTran.left, rtTran.top, SRCCOPY);

    HDC hDIBDC = CreateCompatibleDC(NULL);

    BITMAPINFO hdr;
    ZeroMemory(&hdr, sizeof(BITMAPINFO));

    hdr.bmiHeader.biSize       =  sizeof(BITMAPINFOHEADER);
    hdr.bmiHeader.biWidth      =  nWidth;
    hdr.bmiHeader.biHeight     =  nHeight;
    hdr.bmiHeader.biPlanes     =  1;
    hdr.bmiHeader.biBitCount   =  32;

    BYTE * pbtPixels = NULL;
    HBITMAP hDIBitmap = CreateDIBSection(hDIBDC, (BITMAPINFO *)&hdr, DIB_RGB_COLORS, (void**)&pbtPixels, NULL, 0);
    HBITMAP hOldBmp = (HBITMAP)SelectObject(hDIBDC, hDIBitmap);
    BitBlt(hDIBDC, 0, 0, nWidth, nHeight, bmpDC.m_hDC, 0, 0, SRCCOPY);
    SelectObject(hDIBDC, hOldBmp);

    int nPixelSize = 4;

    BYTE btSR = GetRValue(clrSrc);
    BYTE btSG = GetGValue(clrSrc);
    BYTE btSB = GetBValue(clrSrc);

    for (int i = 0 ; i < nHeight ; i ++)
    {
        for (int j = 0 ;  j < nWidth ; j ++)
        {
            BYTE btB = pbtPixels[i *  nWidth * nPixelSize   + j * nPixelSize  ] ;
            BYTE btG = pbtPixels[i *  nWidth * nPixelSize   + j * nPixelSize + 1 ] ;
            BYTE btR = pbtPixels[i *  nWidth * nPixelSize   + j * nPixelSize + 2 ] ;

            btB = (btSB + btB ) >> 1 ;
            btG = (btSG + btG ) >> 1 ; 
            btR = (btSR + btR ) >> 1 ;

            pbtPixels[i *  nWidth * nPixelSize   + j * nPixelSize  ]    = btB ;
            pbtPixels[i *  nWidth * nPixelSize   + j * nPixelSize + 1 ] = btG ;
            pbtPixels[i *  nWidth * nPixelSize   + j * nPixelSize + 2 ] = btR ;

        }
    }

    SetDIBitsToDevice(pDstDC->GetSafeHdc(),rtTran.left,rtTran.top,nWidth,nHeight,
        0,0,0,nHeight,(void*)pbtPixels,(BITMAPINFO*)&hdr,DIB_RGB_COLORS);

    bmpDC.SelectObject(pOldBmp);
    bmp.DeleteObject();
    delete [] pbtPixels ;
    bmpDC.DeleteDC();
    DeleteObject(hDIBDC);
    DeleteObject(hDIBitmap);
    pDstDC->RestoreDC(nSavedDC);
    pbtPixels=NULL;

    pDstDC->RestoreDC(0);
}

HBITMAP Shadow::GetScreenHBITMAP()
{
    HDC hScrDC = ::GetDC(NULL);
    ASSERT(hScrDC);

    HDC hMemDC = CreateCompatibleDC(hScrDC);
    ASSERT(hMemDC);

    int nWidth = GetSystemMetrics(SM_CXSCREEN); 
 
    int nHeight = GetSystemMetrics(SM_CYSCREEN);

    HBITMAP hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);
    HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

    BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, 0, 0, SRCCOPY);

    hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);

    DeleteDC(hMemDC);
    DeleteDC(hScrDC);

    return hBitmap;
}

CreateCompatibleDC创建的请用DeleteDC释放。不要用DeleteObject(hDIBDC);
[解决办法]

CreateCompatibleDC创建的请用DeleteDC释放。不要用DeleteObject(hDIBDC);那你知道pbtPixels这玩意怎么释放吗？
DeleteObject 释放那个返回的HBITMAP，那个内存里面会自己释放掉的。
msdn原话：The system closes the handle to that memory when you later delete the DIB by calling the DeleteObject function