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Re: [dbus-cplusplus-devel] Calling DeviceKit methods
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From: Andreas V. <li...@br...> - 2009-09-09 18:35:19
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Am Wed, 9 Sep 2009 11:14:57 +0500 schrieb Zoltan Bencik:
Hello Zoltan,
I think that I know the problem. You use the DBus::BusDispatcher
dispatcher Dbus-C++ own main loop. This is not very good tested and
many people have reported problems.
I use the glib and ecore (Gitorious branch) main loop integration with
success. You need a main loop integration that fits to wxWidgets. I'm
sure nobody has tested this yet. Maybe it will work because the wxGTK
toolkit works together with the glib main loop integration.
But pay attention that then it works only with wxGtk, but not other
wxWidget backends.
Look in the glib example hot to use it.
regards
Andreas
> Hello Andreas,
>
> Thanks for your kind response.
>
> It seems like the GUI library(wxWidgets on Linux, wxGTK build) I'm
> using is causing some problems(not sure).
> Could you please tell me if my dbus-c++ usage is correct from the code
> listed below?
> Maybe I missed to register some callbacks, which I have to handle, or
> passing method parameters incorrectly,
> or anything else.
> GUI library throws me an assert, which has to deal with even
> notifiers. I tried to use dbus-c++ in console application, and
> UnMount worked just fine.
>
> Here is the stack trace from Eclipse IDE, when I try to call
> invoke_method. I don't think it will be any helpful, since it's trace
> when GUI is about to die.
>
> Thread [1] (Suspended)
> 22 pthread_mutex_unlock() 0x00ab51a0
> 21 _dl_open() 0x008f69eb
> 20 do_dlopen() 0x00a22952
> 19 _dl_catch_error() 0x008f2806
> 18 __libc_dlopen_mode() 0x00a22b15
> 17 init() 0x009fb858
> 16 pthread_once() 0x00ab73f0
> 15 backtrace() 0x009fba45
> 14 wxStackWalker::SaveStack()
> /home/zoltan/Development/wx/src/unix/stackwalk.cpp:169 0x083edb79
> 13 wxGUIAppTraits::ShowAssertDialog()
> /home/zoltan/Development/wx/src/gtk/utilsgtk.cpp:379 0x08216dd8
> 12 ShowAssertDialog()
> /home/zoltan/Development/wx/src/common/appbase.cpp:836 0x08363cd0
> 11 wxAppConsole::OnAssertFailure()
> /home/zoltan/Development/wx/src/common/appbase.cpp:445 0x08364042
> 10 wxApp::OnAssertFailure()
> /home/zoltan/Development/wx/src/gtk/app.cpp:556 0x0820556f
> 9
> wxOnAssert() /home/zoltan/Development/wx/src/common/appbase.cpp:711
> 0x08363df7 8 wxEventLoop::~wxEventLoop()
> /home/zoltan/Development/wx/src/gtk/evtloop.cpp:64 0x0830fedf
> 7 wxEventLoopPtr::~wxEventLoopPtr()
> /home/zoltan/Development/wx/src/common/appcmn.cpp:74 0x0826f6d5
> 6 wxEventLoopTiedPtr::~wxEventLoopTiedPtr()
> /home/zoltan/Development/wx/src/common/appcmn.cpp:74 0x082705f1
> 5 wxAppBase::MainLoop()
> /home/zoltan/Development/wx/src/common/appcmn.cpp:312 0x0826fe7a
> 4 wxAppBase::OnRun()
> /home/zoltan/Development/wx/src/common/appcmn.cpp:367 0x0826f8b3
> 3
> wxEntry() /home/zoltan/Development/wx/src/common/init.cpp:460
> 0x08395273 2
> wxEntry() /home/zoltan/Development/wx/src/common/init.cpp:472
> 0x08395479 1
> main() /home/zoltan/Development/DBusCPPTest/src/main_app.cpp:42
> 0x0808438b
>
>
> Thanks.
> br,
> -zoltan.
>
> On Wed, Sep 9, 2009 at 1:35 AM, Andreas Volz<li...@br...>
> wrote:
> > Am Tue, 8 Sep 2009 18:34:11 +0500 schrieb Zoltan Bencik:
> >
> > Hello Zoltan,
> >
> > I suggest you should compile dbus-c++ with debug option (--configure
> > --enable-debug), your application with -O0 -ggdb and run it in gdb.
> >
> > This would tell us all a lot of useful information.
> >
> > regards
> > Andreas
> >
> >> Hello All,
> >>
> >> I'm trying to mount and unmount devices through dbus-c++ binding,
> >> using DeviceKit.Disks.Device interface methods.
> >> While trying to unmount device, I get a 'SIGTRAP' signal.
> >> Can anybody show me what I'm doing wrong in this code?
> >>
> >> Thanks, any help is very appreciated.
> >>
> >>
> >> // Proxy implementation
> >> DisksDeviceProxy::DisksDeviceProxy(DBus::Connection &connection,
> >> const char *object_path)
> >> : DBus::InterfaceProxy("org.freedesktop.DeviceKit.Disks"),
> >> DBus::ObjectProxy(connection, object_path,
> >> "org.freedesktop.DeviceKit.Disks.Device")
> >> {
> >> }
> >>
> >> // Mount device
> >> void DisksDeviceProxy::MountDevice(const char *fstype,
> >> std::vector<std::string> &options)
> >> {
> >> ::DBus::CallMessage call;
> >> ::DBus::MessageIter wi = call.writer();
> >>
> >> wi << fstype;
> >> wi << options;
> >> call.member("FilesystemMount");
> >> ::DBus::Message ret = invoke_method (call);
> >> ::DBus::MessageIter ri = ret.reader();
> >> }
> >>
> >> // Unmount device
> >> void DisksDeviceProxy::UnMountDevice(std::vector<std::string>
> >> &options) {
> >> ::DBus::CallMessage call;
> >> ::DBus::MessageIter wi = call.writer();
> >>
> >> wi << options;
> >> call.member("FilesystemUnmount");
> >> ::DBus::Message ret = invoke_method (call); // Signaled
> >> SIGTRAP right here ::DBus::MessageIter ri = ret.reader();
> >> }
> >>
> >> And here is the code, how I'm trying to unmount device:
> >> //-- START
> >> DBus::BusDispatcher dispatcher;
> >> DBus::default_dispatcher = &dispatcher;
> >>
> >> DBus::Connection conn = DBus::Connection::SystemBus();
> >>
> >> DisksDeviceProxy devkit(conn,
> >> "/org/freedesktop/DeviceKit/Disks/devices/sdb1"); // for now, just
> >> hard coded value of my USB device
> >> std::vector<std::string>options;
> >> devkit.UnMountDevice(options);
> >> //-- END
> >>
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