On Jun 2, 2015, at 11:41 PM, Milinda Fernando <milind...@gmail.com> wrote:
> Hello Sean and BRLCAD developers,
>
> I am still trying to create the qt libdm window. Here is my source code
> regarding libdm window creation [1]. When I try to build this I get the
> following error list[2]. What I have done wrong ? How can I fix this ?
>
> /home/milinda/Qt_Projects/brlcad/src/libdm/dm-qt.cpp:722: error: invalid use
> of incomplete type 'struct qt_openFb(dm_internal*)::qt_fb_info'
> qtfb_ps->qapp = privars->qapp;
> ^
When presented with a wall of errors, it’s best to only focus on the first one.
As you can see, the error says that you have an incomplete type. What does
that mean?
A quick web search and you’d find that an incomplete type in C (particularly
with an incomplete struct, which is your case here) usually means something was
forward declared (e.g., “struct foo;”) but not fully declared (e.g.”struct foo
{int a;};”. This usually means you are missing a header or preprocessor symbol.
You need to look at the qt_openFb(dm_internal*)::qt_fb_info struct and figure
out what wasn’t fully declared. Given the dm headers require preprocessor
symbols be defined in order to know which display types are available (e.g.,
DM_X, DM_OGL, etc), that might be the first place to look. Read the headers
you include and make sure the structures you’re using will be fully declared.
Cheers!
Sean
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