<!> event has invalid window

Support Basics & Interface
#1

Hi Guys,

I recently started checking the Blender console as a way of troubleshooting Blender, a great interface tool very rarely mentioned; I found no errors in general, but I was surprised that on closing the User’s Preferences the console throws a cryptic message that I guess is a warning: <!> event has invalid window. I can reproduce this consistently: on closing the User’s preferences the console invariably prints the warning (see screenshot).


This does not appear to affect any other functionality of Blender, but I am just curious; does anybody know the cause of this or, even better, a solution?. I am testing on Blender 2.74 (official release), Windows 7 64 bits 12 GB RAM Intel Core 3.4 Ghz. with a AMD Radeon HD 7770.

Can anybody help? Thanks in advance to everyone out there.

#2

Anybody out there?

#3

I’m not getting the same on Linux, perhaps it’s something Windows-specific? If I had to guess, it means some input event (mouse motion, etc.) gets scheduled to the preferences window after it was already destroyed. I wouldn’t worry about it.
Looking at the code, there are comments suggesting it should be investigated, but that’s about it (source/blender/windowmanager/intern/wm_window.c).


else if (!GHOST_ValidWindow(g_system, ghostwin)) {
    /* XXX - should be checked, why are we getting an event here, and */
    /* what is it? */
    puts("&lt;!&gt; event has invalid window");
    return 1;
}
#4

Stan, thanks for the heads up; you are right: this is by no means a real problem, in fact it isn’t even an error, but a warning; I am glad to see from your response that somebody else also wondered about it; do you have any idea what is the IF of that ELSE?

I’ll keep an eye open for news on this issue.

#5

Looks to be some sanity checking going on there, here’s the direct link to that file: https://git.blender.org/gitweb/gitweb.cgi/blender.git/blob/HEAD:/source/blender/windowmanager/intern/wm_window.c

#6

Thanks for the link. I guess I can call this issue solved.

Sept