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Segmentation Fault on click to open new frame


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  #1  
Old October 16th, 2012, 04:10 AM
gokulkumargopal gokulkumargopal is offline
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Segmentation Fault on click to open new frame
Hello,

I am beginner and this is my first post. Please bear with me if the information is not complete.

I have a written a small program to open a login window to input credentials to connect to oracle database.

Basically, I would like to display a login window on click of the New Connection button to read database credentials.

Here are the details..

OS Details:
-----------
gokul@gokul-VirtualBox:~/python_scripts$ cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"

Python Version: 2.7.3

Code:
import wx
import cx_Oracle

class PerfFrame(wx.Frame):
    def __init__(self,parent,title):
        frame = wx.Frame.__init__(self,parent,title=title)        
        
        self.CreateStatusBar()
        
        self.frame = frame
        # Menu Details
        perfmenu = wx.Menu()
        newcon = wx.MenuItem(perfmenu,wx.NewId(),"&New Connection","Opening a new connection")
        perfmenu.AppendItem(newcon)
        perfmenu.AppendSeparator()
        menuAbout = perfmenu.Append(wx.ID_ABOUT,"&About","Information about this program")
        perfmenu.AppendSeparator()
        menuExit = perfmenu.Append(wx.ID_EXIT,"E&xit","Exit the program")
        
        mainmenu = wx.MenuBar()
        mainmenu.Append(perfmenu,"Perf")
        self.SetMenuBar(mainmenu)

        self.Bind(wx.EVT_MENU, self.OnConn, newcon)
        self.Bind(wx.EVT_MENU, self.OnAbout, menuAbout)
        self.Bind(wx.EVT_MENU, self.OnExit, menuExit)     
        self.Show(True)

    def OnCloseWindow (self, event):
        self.Destroy()        

    def OnConn(self,event):
        AP_LoginPanel(self.frame,"Authentification required!")
        

    def OnAbout(self,event):
        dlg=wx.MessageDialog(self,"Open Source App to View AWR","About Performance Maintenance",wx.OK)
        dlg.ShowModal()
        dlg.Destroy()

    def OnExit(self,event):
        self.Close(True)

class AP_LoginPanel(wx.Frame):
    def __init__(self, parent, title):
        frame = wx.Frame.__init__(self,parent,title=title)
        self.panel = wx.Panel(frame)
        self.frame = frame

        self.showLoginBox()

    def showLoginBox (self):
  # Create the sizer
        sizer = wx.FlexGridSizer(rows=3, cols=2, hgap=5, vgap=15)

  # Username
        self.txt_Username = wx.TextCtrl(self.panel, 1, size=(150, -1))
        lbl_Username = wx.StaticText(self.panel, -1, "Username:")
        sizer.Add(lbl_Username,0, wx.LEFT|wx.TOP| wx.RIGHT, 50)
        sizer.Add(self.txt_Username,0, wx.TOP| wx.RIGHT, 50)

  # Password
        self.txt_Password = wx.TextCtrl(self.panel, 1, size=(150, -1), style=wx.TE_PASSWORD)
        lbl_Password = wx.StaticText(self.panel, -1, "Password:")
        sizer.Add(lbl_Password,0, wx.LEFT|wx.RIGHT, 50)
        sizer.Add(self.txt_Password,0, wx.RIGHT, 50)

  # Submit button
        btn_Process = wx.Button(self.panel, -1, "&Login")
        self.panel.Bind(wx.EVT_BUTTON, self.OnSubmit, btn_Process)
        sizer.Add(btn_Process,0, wx.LEFT, 50)

        self.panel.SetSizer(sizer)

    def OnSubmit(self, event):
        UserText = self.txt_Username.GetValue()
        PasswordText = self.txt_Password.GetValue()
    

app=wx.App(False)
PerfFrame(None,"Oracle Perf Maintenance")
app.MainLoop()


While executing the program, I get a coredump on Click of the New Connection button.

Here is the backtrace information.

Code:
(gdb) bt
#0  0x00000000 in ?? ()
#1  0xb73a1ddf in wxWindow::DoAddChild(wxWindow*) () from /usr/lib/i386-linux-gnu/libwx_gtk2u_core-2.8.so.0
#2  0xb740e6d4 in wxTextCtrl::Create(wxWindow*, int, wxString const&, wxPoint const&, wxSize const&, long, wxValidator const&, wxString const&)
    () from /usr/lib/i386-linux-gnu/libwx_gtk2u_core-2.8.so.0
#3  0xb740eb3e in wxTextCtrl::wxTextCtrl(wxWindow*, int, wxString const&, wxPoint const&, wxSize const&, long, wxValidator const&, wxString const&) () from /usr/lib/i386-linux-gnu/libwx_gtk2u_core-2.8.so.0
#4  0xb5d2e26d in ?? () from /usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_controls_.so
#5  0x0808c7bd in PyEval_EvalFrameEx ()
#6  0x081a7d70 in PyEval_EvalCodeEx ()
#7  0x081a9e42 in ?? ()
#8  0x0811101f in PyObject_Call ()
#9  0x080cc417 in ?? ()
#10 0x0811101f in PyObject_Call ()
#11 0x080cb3c6 in ?? ()
#12 0x08110ae9 in ?? ()
#13 0x0811101f in PyObject_Call ()
#14 0x080893c6 in PyEval_EvalFrameEx ()
#15 0x080890cc in PyEval_EvalFrameEx ()
#16 0x081a7d70 in PyEval_EvalCodeEx ()
#17 0x081a9cfe in ?? ()
#18 0x0811101f in PyObject_Call ()
#19 0x080cc417 in ?? ()
#20 0x0811101f in PyObject_Call ()
#21 0x080cb3c6 in ?? ()
#22 0x08110ae9 in ?? ()
#23 0x0811101f in PyObject_Call ()
#24 0x080893c6 in PyEval_EvalFrameEx ()
#25 0x081a7d70 in PyEval_EvalCodeEx ()
#26 0x081a9cfe in ?? ()
#27 0x0811101f in PyObject_Call ()
#28 0x080cc417 in ?? ()
#29 0x0811101f in PyObject_Call ()
#30 0x08114b19 in PyEval_CallObjectWithKeywords ()
#31 0xb7666e12 in wxPyCallback::EventThunker(wxEvent&) () from /usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core_.so
---Type <return> to continue, or q <return> to quit---
#32 0xb7137038 in wxAppConsole::HandleEvent(wxEvtHandler*, void (wxEvtHandler::*)(wxEvent&), wxEvent&) const ()
   from /usr/lib/i386-linux-gnu/libwx_baseu-2.8.so.0
#33 0xb71c678a in wxEvtHandler::ProcessEventIfMatches(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&) ()
   from /usr/lib/i386-linux-gnu/libwx_baseu-2.8.so.0
#34 0xb71c6bb1 in wxEvtHandler::SearchDynamicEventTable(wxEvent&) () from /usr/lib/i386-linux-gnu/libwx_baseu-2.8.so.0
#35 0xb71c6c9c in wxEvtHandler::ProcessEvent(wxEvent&) () from /usr/lib/i386-linux-gnu/libwx_baseu-2.8.so.0
#36 0xb73f9fd7 in ?? () from /usr/lib/i386-linux-gnu/libwx_gtk2u_core-2.8.so.0
#37 0xb6a971ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#38 0xb6a95484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#39 0xb6aa70d9 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#40 0xb6aaf2dc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#41 0xb6aaf453 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#42 0xb6cf14ea in gtk_menu_item_activate () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
#43 0xb203bc21 in ?? () from /usr/lib/i386-linux-gnu/libdbusmenu-gtk.so.4
#44 0xb6a97841 in g_cclosure_marshal_VOID(unsigned int0_t, void) () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#45 0xb6a95727 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#46 0xb6aaea29 in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#47 0xb6aaf453 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#48 0xb20186fe in ?? () from /usr/lib/i386-linux-gnu/libdbusmenu-glib.so.4
#49 0xb201b4fe in dbusmenu_menuitem_handle_event () from /usr/lib/i386-linux-gnu/libdbusmenu-glib.so.4
#50 0xb201cde3 in ?? () from /usr/lib/i386-linux-gnu/libdbusmenu-glib.so.4
#51 0xb69d6a3f in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#52 0xb69d5cda in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#53 0xb69d60e5 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#54 0xb69d652b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#55 0xb6cdcb8f in gtk_main () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
#56 0xb738e63a in wxEventLoop::Run() () from /usr/lib/i386-linux-gnu/libwx_gtk2u_core-2.8.so.0
#57 0xb741390f in wxAppBase::MainLoop() () from /usr/lib/i386-linux-gnu/libwx_gtk2u_core-2.8.so.0
#58 0xb7663523 in wxPyApp::MainLoop() () from /usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core_.so
#59 0xb76809b4 in ?? () from /usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core_.so
#60 0x0808c7bd in PyEval_EvalFrameEx ()
#61 0x081a7d70 in PyEval_EvalCodeEx ()
#62 0x081a9cfe in ?? ()
#63 0x0811101f in PyObject_Call ()
---Type <return> to continue, or q <return> to quit---
#64 0x080cc417 in ?? ()
#65 0x0811101f in PyObject_Call ()
#66 0x080893c6 in PyEval_EvalFrameEx ()
#67 0x080890cc in PyEval_EvalFrameEx ()
#68 0x081a7d70 in PyEval_EvalCodeEx ()
#69 0x08151e21 in PyRun_SimpleFileExFlags ()
#70 0x0815a4d9 in Py_Main ()
#71 0x0805e78b in main ()
(gdb)


I don't know what is wrong here. Can someone help pls ?

Rgds,
Gokul
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  #2  
Old October 16th, 2012, 11:37 AM
b49P23TIvg's Avatar
b49P23TIvg b49P23TIvg is offline
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Excluding modules like ctypes, a high level interface (python) to a compiled library should not be able to dereference NULL.

I'd say you found a bug in wxWidgets C++ class library, and you should report it back through wxPython.

I haven't installed wx... . Sometimes you can work around this sort of problem by calling the routines in a different order.

Good luck.
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  #3  
Old October 16th, 2012, 12:26 PM
Purity_Lake Purity_Lake is offline
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Quote:
Originally Posted by b49P23TIvg
Excluding modules like ctypes, a high level interface (python) to a compiled library should not be able to dereference NULL.

I'd say you found a bug in wxWidgets C++ class library, and you should report it back through wxPython.

I haven't installed wx... . Sometimes you can work around this sort of problem by calling the routines in a different order.

Good luck.


I don't think gokulkumargopal can work around the code, i've been the testing the code for a while and traced the problem the the AP_LoginPanel call in his OnConn() function. debug informations says that __init__() requires exactly 3 arguments (1 given).. i have give a very large amount of arguments and yet for some reason it gives the exact same error, most likely a bug in the code, unless you have any idea why it wont accept all the the other parameters
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  #4  
Old October 17th, 2012, 06:49 AM
gokulkumargopal gokulkumargopal is offline
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Thanks for your response. I removed the reference to panel in the below part of the code, and it worked. Not able to find the explanation here..

Code:
  # Username
        self.txt_Username = wx.TextCtrl(self, 1, size=(150, -1))
        lbl_Username = wx.StaticText(self, -1, "Username:")
        sizer.Add(lbl_Username,0, wx.LEFT|wx.TOP| wx.RIGHT, 50)
        sizer.Add(self.txt_Username,0, wx.TOP| wx.RIGHT, 50)

  # Password
        self.txt_Password = wx.TextCtrl(self, 1, size=(150, -1), style=wx.TE_PASSWORD)
        lbl_Password = wx.StaticText(self, -1, "Password:")
        sizer.Add(lbl_Password,0, wx.LEFT|wx.RIGHT, 50)
        sizer.Add(self.txt_Password,0, wx.RIGHT, 50)

  # Submit button
        btn_Process = wx.Button(self, -1, "&Login")
        self.Bind(wx.EVT_BUTTON, self.OnSubmit, btn_Process)
        sizer.Add(btn_Process,0, wx.LEFT, 50)

        self.SetSizer(sizer)

    def OnSubmit(self, event):
        UserText = self.txt_Username.GetValue()
        PasswordText = self.txt_Password.GetValue()
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