[Wendell writes:]
> I'm having trouble porting a working gui/modal program from
> Linux to Windows. It runs fine on Linux, and runs for a while
> on Windows, but ends up with the following error:
> gui__center_string(&null,105,57,"N40",&null) from
> line 43 in textbutton.icn
> TextWidth(&null,"N40") from line 205 in guiprocs.icn
Interesting. Your button's cbwin field is null, which suggests that
after a finally() wiped it out, a subsequent init() did not restore it.
> When one message is received (alone), and only one button changes color,
> it seems to work fine.
> (I'm not sure about the finally, init, or resize, but calling
> them makes the button color take effect.)
> Any suggestions?
(1) it is probably possible to avoid the recalling the finally/init pair.
For example, after calling set_attribs() one can probably call
WAttrib ! ([button[index].cbwin] ||| button[index].attribs)
WAttrib ! ([\ (button[index].cwin)] ||| button[index].attribs)
to set the attributes on the button's window references, and then
invalidate and/or resize in order to get them redrawn.
(2) If you boil your bug down to a reproducible state, possibly
by building some lists with which to fake/hardwire the UDP behavior
which triggers the bug, I would be happy to dig deeper and try to
understand why Windows buggy behavior doesn't match Linux good behavior.
Clint
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