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I have png in Gdiplus::image. I can render image using below code.

Gdiplus::Graphics graphics(dc);
graphics.DrawImage(m_pBitmap, 0, 0);
Now how to  draw png with a transparent color so all pixels of a certain color (for example:  RGB(255,255,255)) show transparently and you can see the background where the transparent pixels are using Gdiplus.
Can I get any sample code?
    Gdiplus::Bitmap bm(L"transparent.png", TRUE);
    if(bm.GetLastStatus() == Gdiplus::Status::Ok)
        Gdiplus::Graphics gr(hdc);
        Gdiplus::ImageAttributes attr;
        attr.SetColorKey(Gdiplus::Color(255, 255, 255), Gdiplus::Color(255, 255, 255),
            Gdiplus::ColorAdjustTypeBitmap);
        gr.DrawImage(
            Gdiplus::Rect(0, 0, bm.GetWidth(), bm.GetHeight()),
            0, 0, bm.GetWidth(), bm.GetHeight(),
            Gdiplus::UnitPixel,
            &attr);
        MessageBox(0, L"error", 0, 0);
        
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