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List:       kde-devel
Subject:    dynamic_cast failure
From:       Josef Spillner <dr_maux () maux ! de>
Date:       2001-07-27 7:31:42
[Download RAW message or body]

When using KMainWindow's createGUI() method without having an XML file 
present, it is possible that this leads to a crash.
The critical point is in KAction::plugMainWindowAccel, line 565:
	KMainWindow * mw = dynamic_cast<KMainWindow *>(tl);
	// try to see if it's a kmainwindow 
I'm not sure why this segfaults, because when I tested it with
	if(tl->inherits("KMainWindow"))
it returns true.

So I replaced the remaining lines with:
	if(tl->inherits("KMainWindow"))
	{
		plugAccel(((KMainWindow*)tl)->accel());
	}
This works for me and doesn't seem to affect other apps in a negative way.

Josef

The original backtrace was:
(no debugging symbols found)...0x40b75d29 in wait4 () from /lib/libc.so.6
#0  0x40b75d29 in wait4 () from /lib/libc.so.6
#1  0x40bd0cd8 in __check_rhosts_file () from /lib/libc.so.6
#2  0x40e7a65b in waitpid () from /lib/libpthread.so.0
#3  0x409f9975 in KCrash::defaultCrashHandler ()
   from /usr/local/kde2.2/lib/libkdecore.so.3
#4  0x40b17868 in sigaction () from /lib/libc.so.6
#5  0x40850ab1 in KAction::plugMainWindowAccel ()
   from /usr/local/kde2.2/lib/libkdeui.so.3
#6  0x4084fb9e in KAction::plug () from /usr/local/kde2.2/lib/libkdeui.so.3
#7  0x40889a46 in KXMLGUIFactory::buildRecursive ()
   from /usr/local/kde2.2/lib/libkdeui.so.3
#8  0x4088b1fd in KXMLGUIFactory::buildRecursive ()
   from /usr/local/kde2.2/lib/libkdeui.so.3
#9  0x4088b1fd in KXMLGUIFactory::buildRecursive ()
   from /usr/local/kde2.2/lib/libkdeui.so.3
#10 0x4088891b in KXMLGUIFactory::addClient ()
   from /usr/local/kde2.2/lib/libkdeui.so.3
#11 0x407f5449 in KMainWindow::createGUI ()
   from /usr/local/kde2.2/lib/libkdeui.so.3
#12 0x80501e7 in QWidget::closeEvent ()
#13 0x804cdc1 in QWidget::closeEvent ()
#14 0x40b11a52 in __libc_start_main () from /lib/libc.so.6

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