From: Marco Polo <watson.the.burne@...>
Date: 2010-12-06T03:50:26+09:00
Subject: Re: qt4-ruby crash

This is the piece of code that makes ruby to crash:

<code>
    def load_plists
        #return
        @ui.lists_tv.clear
        DBIntf::connection.execute( "SELECT * FROM plists ORDER BY
LOWER(sname)" ) do |row|
            @ui.lists_tv.addTopLevelItem(Qt::TreeWidgetItem.new {
setText(0, row[0]); setText(1, row[1]) })
        end
    end
</code>

I added the order by statement to get rid from the sort in the tree
view. The tree view comes from a qtdesigner ui file and is used as a
list
view, there are no children and only 16 entries in the sqlite3 plists
table.
In another similar case, slightly more complex, i have 2000+ entries and
it works even if sort is enabled but only if the code is surrounded with
GC.enable/disable:

<code>
    def load_entries
        clear

        GC.disable
        has_compile = false
        DBIntf::connection.execute(generate_sql) do |row|
            map_row_to_entry(row, Qt::TreeWidgetItem.new)
            has_compile = true if row[ROW_REF] == "0"
        end
        unless @mc.main_filter.empty?
            unless has_compile
                map_row_to_entry(["0", "Compilation"],
Qt::TreeWidgetItem.new)
            end
        end

        GC.enable
        return self
    end
</code>

In this case, the class inherits a treeview.

Thanks for the links and your help.

marco

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