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List:       kde-devel
Subject:    RE: QPrinter Question
From:       "Goffioul Michael" <goffioul () imec ! be>
Date:       2003-12-02 8:23:45
[Download RAW message or body]

I'm summarizing my answers to the thread in this mail.

1) about the backtrace below: using KPrinter in a plain QT
   app does not work, you'll need at least a KInstance or a
   KApplication object. If you're developing a cross-platform
   app, I guess you're still using a QApplication object?

2) about QPrinter not finding the printers: Qt has support
   for CUPS, but it needs to be built in the library. Otherwise,
   it's possible that simply Qt cannot get the printer list
   from CUPS. Possible solutions:
	- check if Qt is linked to libcups (use "ldd")
	- configure CUPS to create a printcap file, such that
        Qt can still access printer list using the old LPR-way
        (done in /etc/cups/cupsd.conf, see CUPS doc)

Michael.

> -----Original Message-----
> From: Jason Terando [mailto:jason.terando@verizon.net]
> Sent: Tuesday, December 02, 2003 05:21
> To: kde-devel@kde.org
> Subject: Re: QPrinter Question
> 
> 
> Hi,
> 
> Thanks for the reply, I got it to link.  My program runs, but when I 
> call my function which puts a KPrinter on the stack, I get the 
> following, and I'm wondering if I need to do something else to use 
> KPrinter in a QT app.
> 
> TIA
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x410a1a9d in KInstance::iconLoader() const () from 
> /opt/kde3.1.4/lib/libkdecore.so.4
> (gdb) info thread
> * 1 Thread 16384 (LWP 29322)  0x410a1a9d in KInstance::iconLoader() 
> const () from /opt/kde3.1.4/lib/libkdecore.so.4
> (gdb) backtrace
> #0  0x410a1a9d in KInstance::iconLoader() const () from 
> /opt/kde3.1.4/lib/libkdecore.so.4
> #1  0x4109a944 in KGlobal::iconLoader() () from 
> /opt/kde3.1.4/lib/libkdecore.so.4
> #2  0x40051297 in KMFactory::KMFactory() () from 
> /opt/kde3.1.4/lib/libkdeprint.so.4
> #3  0x40050d2d in KMFactory::self() () from 
> /opt/kde3.1.4/lib/libkdeprint.so.4
> #4  0x400911b1 in KPReloadObject::KPReloadObject(bool) () from 
> /opt/kde3.1.4/lib/libkdeprint.so.4
> #5  0x400712e4 in KPrinter::KPrinter(bool, QPrinter::PrinterMode) () 
> from /opt/kde3.1.4/lib/libkdeprint.so.4
> #6  0x08053601 in AddMachine::print() ()
> #7  0x0805d209 in AddMachine::qt_invoke(int, QUObject*) ()
> #8  0x40315a79 in QObject::activate_signal(QConnectionList*, 
> QUObject*) 
> () from /opt/kde3.1.4/lib/libqt-mt.so.3
> #9  0x405f3d52 in QSignal::signal(QVariant const&) () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #10 0x4032fcf8 in QSignal::activate() () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #11 0x40404525 in QPopupMenu::keyPressEvent(QKeyEvent*) () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #12
>  0x40349c9c in QWidget::event(QEvent*) () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #13 0x402b7bc4 in QApplication::internalNotify(QObject*, QEvent*) () 
> from /opt/kde3.1.4/lib/libqt-mt.so.3
> #14 0x402b7757 in QApplication::notify(QObject*, QEvent*) () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #15 0x4025f41c in QETWidget::translateKeyEvent(_XEvent 
> const*, bool) () 
> from /opt/kde3.1.4/lib/libqt-mt.so.3
> #16 0x4025b412 in QApplication::x11ProcessEvent(_XEvent*) () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #17 0x402705e1 in QEventLoop::processEvents(unsigned) () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #18 0x402cba26 in QEventLoop::enterLoop() () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #19 0x402cb8c8 in QEventLoop::exec() () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #20 0x402b7df1 in QApplication::exec() () from 
> /opt/kde3.1.4/lib/libqt-mt.so.3
> #21 0x080549c4 in main ()
> #22 0x4095f7f7 in __libc_start_main () from /lib/i686/libc.so.6
> 
> 
 
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