The 'problem' is that EPROCESS relies on kernel mode types defined in the DDK (it isn't exactly meant to be used in user mode).
Try something like:

#include <ntddk.h>
#include <pstypes.h>

If that doesn't work for you, then you probably have to fix every missing definition by hand.

> Date: Fri, 23 Jan 2009 00:12:59 +0900
> From: junkoi2004@gmail.com
> To: ros-dev@reactos.org
> Subject: Re: [ros-dev] Use kernel types in include files?
>
> Please somebody helps me?
>
> I guess I can compile the code in userspace by set a particular macro
> (so to deactivate the NTOS_MODE_USER macro), because the kernel code
> of ReactOS can do that, too.
>
> Unfortunately I still cannot find how to do that. The code is
> complicated compiled in the way I am not familar with, so I am really
> struggling here ;-(
>
> Thanks a lot,
> Jun
>
> On Tue, Jan 20, 2009 at 12:50 PM, Jun Koi <junkoi2004@gmail.com> wrote:
> > On Tue, Jan 20, 2009 at 11:53 AM, Jun Koi <junkoi2004@gmail.com> wrote:
> >> Hi,
> >>
> >> I am working on a project to parse the Windows image file. To do that,
> >> I must understand the structure of some Windows components, like
> >> _EPROCESS. So I took some headers from ReactOS, and write *userland*
> >> code like below:
> >>
> >> ----
> >> #include <pstypes.h>
> >> #include <stdio.h>
> >>
> >> int main()
> >> {
> >> printf("size of EPROCESS: %d\n", sizeof(struct _EPROCESS));
> >> return 0;
> >> }
> >> ----
> >>
> >> The I got the problem: g++ reported that _EPROCESS is incomplete.
> >>
> >> Clearly this means it doesnt see the structure _EPROCESS, so I took a
> >> closer look, and found that _EPROCESS is not defined in user-mode
> >> (NTOS_MODE_USER). I tried to fix it by putting
> >>
> >> #undef NTOS_MODE_USER
> >>
> >> in front of #include <pstypes>, but that doesnt help.
> >>
> >> Anybody please tell me if there is any way to fix this?
> >>
> >> I think I can fix that by modifying the original headers. but that is
> >> way too ugly.
> >>
> >
> > I forgot to say that I compiled the above code with command like this:
> >
> > g++ $(NDK_INCLUDE) test.c -o test
> >
> > with NDK_INCLUDE is pointed to a set of header directories.
> >
> > Thanks,
> > J
> >
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