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<TITLE> [Gtk-sharp-list] NullReferenceException issues - suggestion for
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<H1>[Gtk-sharp-list] NullReferenceException issues - suggestion for
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solutions</H1>
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<B>Thomas Harning Jr.</B>
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<A HREF="mailto:gtk-sharp-list%40lists.ximian.com?Subject=%5BGtk-sharp-list%5D%20NullReferenceException%20issues%20-%20suggestion%20for%0A%09solutions&In-Reply-To=42A4A646.7090805%40gmail.com"
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TITLE="[Gtk-sharp-list] NullReferenceException issues - suggestion for
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solutions">harningt at gmail.com
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</A><BR>
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<I>Mon Jun 6 16:56:46 EDT 2005</I>
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<LI>Previous message: <A HREF="005957.html">[Gtk-sharp-list] NullReferenceException issues - suggestion for
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<!--beginarticle-->
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<PRE>Thomas Harning Jr. wrote:
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><i> Thomas Harning Jr. wrote:
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</I>><i> ...
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</I>><i>
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</I>>>><i>I've found that calling .Ref() on the Pixbuf will save it, andso
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</I>>>><i>will adding that pixbuf to an arraylist to preserve a reference
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</I>>>><i>to it.
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</I>>>><i>* This is a HORRIBLE kludge and I'm not even sure if it fixes it
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</I>>>><i>permanently (it stops the NRE in the short-run).
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</I>><i>
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</I>><i> ...
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</I>><i>
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</I>><i> I think I may have found the culprit... I had a thread that was
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</I>><i> setting values in the Treestore that called upon the TreeView to
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</I>><i> update through the ThreadNotify method... thinking that the
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</I>><i> TreeStore wasn't 'quite' GUI-enough to need thread-protection. But
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</I>><i> it seems that way.
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</I>><i> I removed all reference preservation and the .Ref() from the Pixbuf
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</I>><i> as well as columns and such... and there are no more crashes.
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</I>><i> I'll keep my eye open for this occurring in the future, however.
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</I>
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Well the virtually untraceable error has come back.
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I got GDB to trace it... and the highest point on the stack is
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g_timeout_funcs in libglib-2.0.so.0
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[there are 4 more stack elements above it, but they won't resolve w/
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mono via mono_print_method_from_ip.]
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I've tried to run mono --debug with GDB.... and the application
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runs fine. Strangely.. without GDB, mono --debug almost instantly
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crashes out w/ NRE.
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The thing I added which seems to have retriggered the NRE problems
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is using a single-column TreeStore and using callbacks to get the
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value for the other columns by referencing the object inside the
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TreeStore.
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The callbacks are preserved in instance variables so they don't get
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collected (which is apparently an issue in passing callbacks to GTK#).
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--
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Thomas Harning Jr.
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</PRE>
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