把GDI中的CBitmap转成GDI+中的Bitmap

 GDI+ 使用前要初始化

ULONG_PTR m_gdiplusToken;
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL)

CBitmap 转 Bitmap:
Bitmap m_pBackBmp = ::new Bitmap((HBITMAP)::GetCurrentObject(CurDC, OBJ_BITMAP),NULL);