public HRESULT Clone(out IStream stream)
{
// The cloned object should have the same current "position"
stream = new GPStream(_dataStream)
{
_virtualPosition = _virtualPosition
};
return(HRESULT.S_OK);
}
public unsafe void Save(Stream outputStream)
{
if (_iconData != null)
{
outputStream.Write(_iconData, 0, _iconData.Length);
}
else
{
if (outputStream == null)
{
throw new ArgumentNullException(nameof(outputStream));
}
// Ideally, we would pick apart the icon using
// GetIconInfo, and then pull the individual bitmaps out,
// converting them to DIBS and saving them into the file.
// But, in the interest of simplicity, we just call to
// OLE to do it for us.
PICTDESC pictdesc = PICTDESC.CreateIconPICTDESC(Handle);
Guid iid = DrawingCom.IPicture.IID;
IntPtr lpPicture;
Marshal.ThrowExceptionForHR(OleCreatePictureIndirect(&pictdesc, &iid, fOwn: 0, &lpPicture));
IntPtr streamPtr = IntPtr.Zero;
try
{
// Use UniqueInstance here because we never want to cache the wrapper. It only gets used once and then disposed.
using DrawingCom.IPicture picture = (DrawingCom.IPicture)DrawingCom.Instance
.GetOrCreateObjectForComInstance(lpPicture, CreateObjectFlags.UniqueInstance);
var gpStream = new GPStream(outputStream, makeSeekable: false);
streamPtr = DrawingCom.Instance.GetOrCreateComInterfaceForObject(gpStream, CreateComInterfaceFlags.None);
DrawingCom.ThrowExceptionForHR(picture.SaveAsFile(streamPtr, -1, null));
}
finally
{
if (streamPtr != IntPtr.Zero)
{
int count = Marshal.Release(streamPtr);
Debug.Assert(count == 0);
}
if (lpPicture != IntPtr.Zero)
{
int count = Marshal.Release(lpPicture);
Debug.Assert(count == 0);
}
}
}
}
private static unsafe IntPtr LoadGdipImageFromStream(GPStream stream, bool useEmbeddedColorManagement)
{
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(stream);
IntPtr image = IntPtr.Zero;
if (useEmbeddedColorManagement)
{
Gdip.CheckStatus(Gdip.GdipLoadImageFromStreamICM(streamWrapper.Ptr, &image));
}
else
{
Gdip.CheckStatus(Gdip.GdipLoadImageFromStream(streamWrapper.Ptr, &image));
}
return(image);
}
internal static IStreamWrapper GetComWrapper(GPStream stream)
{
return(new IStreamWrapper(Marshal.GetComInterfaceForObject <GPStream, Interop.Ole32.IStream>(stream)));
}
