public static Image?GetPictureFromIPictureDisp(object picture)
{
if (picture is null)
{
return(null);
}
int hPal = default;
IPictureDisp pict = (IPictureDisp)picture;
PICTYPE type = (PICTYPE)pict.Type;
if (type == PICTYPE.BITMAP)
{
try
{
hPal = pict.hPal;
}
catch (COMException)
{
}
}
Image?image = GetPictureFromParams(pict.Handle, type, hPal, pict.Width, pict.Height);
GC.KeepAlive(pict);
return(image);
}
private static Image?GetPictureFromParams(
int handle,
PICTYPE type,
int paletteHandle,
int width,
int height)
{
switch (type)
{
case PICTYPE.ICON:
return((Image)Icon.FromHandle((IntPtr)handle).Clone());
case PICTYPE.METAFILE:
WmfPlaceableFileHeader header = new WmfPlaceableFileHeader
{
BboxRight = (short)width,
BboxBottom = (short)height
};
using (var metafile = new Metafile((IntPtr)handle, header, deleteWmf: false))
{
return((Image)metafile.Clone());
}
case PICTYPE.ENHMETAFILE:
using (var metafile = new Metafile((IntPtr)handle, deleteEmf: false))
{
return((Image)metafile.Clone());
}
case PICTYPE.BITMAP:
return(Image.FromHbitmap((IntPtr)handle, (IntPtr)paletteHandle));
case PICTYPE.NONE:
// MSDN says this should not be a valid value, but comctl32 returns it...
return(null);
case PICTYPE.UNINITIALIZED:
return(null);
default:
throw new ArgumentException("AXUnknownImage", nameof(type));
}
}
public static Image?GetPictureFromIPicture(object picture)
{
int hPal = default;
IPicture pict = (IPicture)picture;
PICTYPE type = (PICTYPE)pict.Type;
if (type == PICTYPE.BITMAP)
{
try
{
hPal = pict.hPal;
}
catch (COMException)
{
}
}
return(GetPictureFromParams(pict.Handle, type, hPal, pict.Width, pict.Height));
}