[python-win32] Resource limits in wxPython/wxWidgets ?

[Paul Weimer]

It sounds like you're exceeding the number of window handles the os has
available. We ran into a similiar issue with MFC apps as well.

-----Original Message-----
From: Mike Cannon [mailto:m_cannon at pacbell.net]
Sent: Saturday, April 17, 2004 10:04 AM
To: python-win32 at python.org
Subject: [python-win32] Resource limits in wxPython/wxWidgets ?



Hi,


I'm building a wxPython application that is a wxNotebook with (so far)
40 tabs.  Each tab has about 200 controls, mostly wxCheckBox,
wxTextCtrl, and wxStaticText.

At this size, the app fails with the stack trace below.  Mostly it
fails in a call to wxCheckBox() (there are more of them) but it will
also fail like this in wxTextCtrl() (example below) or wxStaticText().

If I remove/add controls earlier in the sequence it just fails later/
earlier at the end.

Any help, please ?



Thanks,

Mike


================

 Windows XP, 
 Python 2.3.2 (#49, Oct  2 2003, 20:02:00) 
  [MSC v.1200 32 bit (Intel)] on win32,
 wxVERSION_STRING  = '2.4.2.4'

================

Traceback (most recent call last):
  File "FWSEngine.py", line 190, in ?
    main()
  File "FWSEngine.py", line 172, in main
    exec (expr)
  File "<string>", line 1, in ?
  File "FWSEngine.py", line 50, in putCategoriesLex
    self.putCategory ( cat )
  File "FWSEngine.py", line 81, in putCategory
    self.putCategoryFromColumns (cols)
  File "FWSEngine.py", line 95, in putCategoryFromColumns
    self.putLabeledCoreChoice (label, ccid)
  File "FWSEngine.py", line 106, in putLabeledCoreChoice
    self.TF.putLabeledChoiceByType ( label, items, ctype, notess)
  File "r:\Mello-et-al\FWSTopFrame.py", line 455, in putLabeledChoiceByType
    items, ctype, notess)
  File "r:\Mello-et-al\FWSPanel.py", line 280, in putLabeledChoiceByType
    if ctype == "C": self.putConditionChoiceItems (items, label, notess)
  File "r:\Mello-et-al\FWSPanel.py", line 297, in putConditionChoiceItems
    w = self._ccBoxLabelAndItems (label, items, otherItems, notess)
  File "r:\Mello-et-al\FWSPanel.py", line 345, in _ccBoxLabelAndItems
    y4 = self._ccGridPointsOthers (pnl, ccP["X00"], max (y2, y3),
otherItems)
  File "r:\Mello-et-al\FWSPanel.py", line 421, in _ccGridPointsOthers
    self._ccwx4CheckBoxes (pnl, wxPoint(x0, y+2), oItem, tbPos, tbSize)
  File "r:\Mello-et-al\FWSPanel.py", line 474, in _ccwx4CheckBoxes
    tb = wxTextCtrl ( pnl, cID, label, tbPos, tbSize )
  File "C:\Python23\lib\site-packages\wxPython\controls.py", line 777, in
__init__
    self.this = controlsc.new_wxTextCtrl(*_args,**_kwargs)

wxPython.wxc.wxPyAssertionError: C++ assertion "wxAssertFailure" failed 
in e:\Projects\wx2.4\src\msw\control.cpp(134): something is very wrong

09:24:22: Debug: e:\Projects\wx2.4\src\msw\app.cpp(439):
'UnregisterClass(canvas)'
failed with error 0x00000584 (class still has open windows.).

09:24:22: Debug: e:\Projects\wx2.4\src\msw\app.cpp(446): 'UnregisterClass(no

redraw canvas)' failed with error 0x00000584 (class still has open
windows.).

================

The code snippet in \Projects\wx2.4\src\msw\control.cpp is below.  It
doesn't show much except that CreateWindowEx failed for some reason.
    ...
    m_hWnd = (WXHWND)::CreateWindowEx
                       (
                        exstyle,            // extended style
                        classname,          // the kind of control to create
                        label,              // the window name
                        style,              // the window style
                        x, y, w, h,         // the window position and size
                        GetHwndOf(GetParent()),  // parent
                        (HMENU)GetId(),     // child id
                        wxGetInstance(),    // app instance
                        NULL                // creation parameters
                       );

    if ( !m_hWnd )
    {
        wxLogDebug(wxT("Failed to create a control of class '%s'"),
classname);
==>     wxFAIL_MSG(_T("something is very wrong"));

        return FALSE;
    }
    ...


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