Frans Bouma wrote:
> Although there is one weird thing:
> (and you know more on this than I do I think): the D3D structs are
> redefined in these formats:
>
> [StructLayout(LayoutKind.Sequential, Size=24, Pack=1),
> CLSCompliant(false), MiscellaneousBits(65), DebugInfoInPDB]
> public struct _D3DBOX
> {
>
> }
>
> Without contents.
>
> Perhaps in combination with unmanaged code, I'm not sure.
I think this is because D3DBOX is an unmanaged type and IIRC the content
of the structure isn't available in the type library. From a managed
perspective it is just a bunch of bytes (24 bytes, as you can see in the
StructLayout attribute). In the Managed DirectX SDK there is probably a
value type with the same layout and the wrapper just casts the pointer
types. Something like this:
[StructLayout(LayoutKind.Sequential, Size=24, Pack=1)]
struct Box
{
uint Left;
uint Top;
uint Right;
uint Bottom;
uint Front;
uint Back;
}
unsafe void SomeRandomBoxApi(Box b)
{
pComObject.SomeRandomBoxApi((_D3DBOX*)&b);
}
Now the question is, since SomeRandomBoxApi takes a pointer to a _D3DBOX
(which is equivalent to a pointer to a Box), why pass in the Box by
value?
This would be (much?) more efficient:
unsafe void SomeRandomBoxApi(ref Box b)
{
fixed(Box* p = &b)
{
pComObject.SomeRandomBoxApi((_D3DBOX*)p);
}
}
Regards,
Jeroen
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