fxruby-users

[Fxruby-users] gdb and FXRuby

[Joel V. <vj...@PA...>]

I'm trying to debug a fxerror message that my ruby program generates. 
The message is "FXDCWindow::drawIcon: illegal icon specified." The icon 
works fine in other contexts, so I'm suspecting FXRuby.

I'd like to be able to step into the routines that generate the message, 
to see what the problem is, but I'm not able to 'list' from gdb, even 
after selecting the correct frame. The listing just shows the main() of 
ruby.

The 'sharedlibrary fox' command tells me that symbols for fox.so have 
already been loaded.

Any suggestions?

Re: [Fxruby-users] gdb and FXRuby

[Lyle J. <ly...@kn...>]

Joel VanderWerf wrote:

>
> I'm trying to debug a fxerror message that my ruby program generates. 
> The message is "FXDCWindow::drawIcon: illegal icon specified." The 
> icon works fine in other contexts, so I'm suspecting FXRuby. 

Are you sure that you've called create() on the icon before using it?

> I'd like to be able to step into the routines that generate the 
> message, to see what the problem is, but I'm not able to 'list' from 
> gdb, even after selecting the correct frame. The listing just shows 
> the main() of ruby. 

I guess the obvious question is, did you compile FOX & FXRuby with 
debugging info (-g)? Also, I can't remember if the extconf.rb or 
install.rb scripts try to strip the shared object file of its symbols 
before they install it; you might need to check for that.

> The 'sharedlibrary fox' command tells me that symbols for fox.so have 
> already been loaded. 

OK.

> Any suggestions?

Not right offhand. As I noted earlier, if you're sure the icon file 
itself is OK, I'd double check to see if it has been create-ed yet. That 
is pretty much always the source of the error message you're describing...

Re: [Fxruby-users] gdb and FXRuby

[Joel V. <vj...@PA...>]

Lyle Johnson wrote:
> Joel VanderWerf wrote:
> 
>>
>> I'm trying to debug a fxerror message that my ruby program generates. 
>> The message is "FXDCWindow::drawIcon: illegal icon specified." The 
>> icon works fine in other contexts, so I'm suspecting FXRuby. 
> 
> 
> Are you sure that you've called create() on the icon before using it?

Ah. That seems to be it. Apologies to FXRuby.

In my other code, I was specifying the icon before calling the main 
window's #create, so the icons were created recursively. I'll learn 
eventually...

There's no cost in calling create twice on an icon or other widget is there?

Thanks!

Re: [Fxruby-users] gdb and FXRuby

[Lyle J. <ly...@kn...>]

Joel VanderWerf wrote:

> There's no cost in calling create twice on an icon or other widget is 
> there?

No, not really. I think that all of the create() functions are 
structured like:

    if (!xid) {
       ... create resource ...
       xid = ... handle to created resource...
    }

and so you're just "paying" for the if check.