updatelayeredwindow在远程协助下失败的问题

void Update()
{
    CDC dc = GetDC(m_hWnd);
    CDC dcMemory;
    dcMemory.CreateCompatibleDC(dc);

    CRect rect;
    GetClientRect(m_hWnd, &rect);

    CBitmap bmp = CreateCompatibleBitmap(dc, rect.Width(), rect.Height());
    dcMemory.SelectBitmap(bmp);

    {
        Graphics g(dcMemory);
        g.SetInterpolationMode(InterpolationModeNearestNeighbor);
        g.SetPixelOffsetMode(PixelOffsetModeHalf);

        // Rendering...
    }

    POINT pt = { 0, 0};
    BLENDFUNCTION stBlend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
    SIZE szWindow = { rect.Width(), rect.Height() };
    UpdateLayeredWindow(m_hWnd, dc, NULL, &szWindow, dcMemory, &pt, 0, &stBlend, ULW_ALPHA);
}

void Update()
{
    CDC dc = GetDC(m_hWnd);
    CDC dcMemory;
    dcMemory.CreateCompatibleDC(dc);

    CRect rect;
    GetClientRect(m_hWnd, &rect);

    //
    // 注意：一定要自己创建一个 32 位位图，不要 CreateCompatibleBitmap，否则远程协助下可能无法正常显示
    //

    BITMAPINFOHEADER bmih = { sizeof(BITMAPINFOHEADER) };
    bmih.biWidth          = rect.Width();
    bmih.biHeight         = rect.Height();
    bmih.biPlanes         = 1;
    bmih.biBitCount       = 32; // !注意：要 32 位
    bmih.biCompression    = BI_RGB;

    BYTE *pBits = NULL;
    HBITMAP hBitmap = CreateDIBSection(NULL, (BITMAPINFO *)&bmih, 0, (LPVOID *)&pBits, NULL, 0);
  
    if (hBitmap == NULL)
    {
        return;
    }

    CBitmap bmp(hBitmap);
    dcMemory.SelectBitmap(bmp);

    {
        Graphics g(dcMemory);
        g.SetInterpolationMode(InterpolationModeNearestNeighbor);
        g.SetPixelOffsetMode(PixelOffsetModeHalf);

        // Rendering...
    }

    POINT pt = { 0, 0};
    BLENDFUNCTION stBlend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
    SIZE szWindow = { rect.Width(), rect.Height() };
    UpdateLayeredWindow(m_hWnd, dc, NULL, &szWindow, dcMemory, &pt, 0, &stBlend, ULW_ALPHA);
}