public override object ConvertManagedToNative(object managedValue, Com2PropertyDescriptor pd, ref bool cancelSet)
{
// Don't cancel the set
cancelSet = false;
if (_lastManaged?.Equals(managedValue) == true)
{
object target = _pictureRef?.Target;
if (target != null)
{
return(target);
}
}
// We have to build an IPicture
if (managedValue != null)
{
BOOL own = BOOL.FALSE;
Ole32.PICTDESC pictdesc;
if (managedValue is Icon icon)
{
pictdesc = Ole32.PICTDESC.FromIcon(icon, copy: false);
}
else if (managedValue is Bitmap bitmap)
{
pictdesc = Ole32.PICTDESC.FromBitmap(bitmap);
own = BOOL.TRUE;
}
else
{
Debug.Fail($"Unknown Image type: {managedValue.GetType().Name}");
return(null);
}
Guid iid = typeof(Ole32.IPicture).GUID;
Ole32.IPicture pict = (Ole32.IPicture)Ole32.OleCreatePictureIndirect(ref pictdesc, ref iid, own);
_lastManaged = managedValue;
_lastNativeHandle = (IntPtr)pict.Handle;
_pictureRef = new WeakReference(pict);
return(pict);
}
else
{
_lastManaged = null;
_lastNativeHandle = IntPtr.Zero;
_pictureRef = null;
return(null);
}
}
public override object ConvertNativeToManaged(object nativeValue, Com2PropertyDescriptor pd)
{
if (nativeValue == null)
{
return(null);
}
Debug.Assert(nativeValue is Ole32.IPicture, "nativevalue is not IPicture");
Ole32.IPicture nativePicture = (Ole32.IPicture)nativeValue;
IntPtr handle = (IntPtr)nativePicture.Handle;
if (_lastManaged != null && handle == _lastNativeHandle)
{
return(_lastManaged);
}
if (handle != IntPtr.Zero)
{
switch ((Ole32.PICTYPE)nativePicture.Type)
{
case Ole32.PICTYPE.ICON:
_pictureType = typeof(Icon);
_lastManaged = Icon.FromHandle(handle);
break;
case Ole32.PICTYPE.BITMAP:
_pictureType = typeof(Bitmap);
_lastManaged = Image.FromHbitmap(handle);
break;
default:
Debug.Fail("Unknown picture type");
return(null);
}
_lastNativeHandle = handle;
_pictureRef = new WeakReference(nativePicture);
}
else
{
_lastManaged = null;
_pictureRef = null;
}
return(_lastManaged);
}
