Re: Linux QueryBuilder error

Nice catch!

Regards, Dave.

> -----Original Message-----
> From: Adam H.Pendleton [mailto:fmonkey(at)fmonkey(dot)net]
> Sent: 24 June 2003 21:39
> To: pgadmin-hackers(at)postgresql(dot)org
> Subject: [pgadmin-hackers] Linux QueryBuilder error
>
>
> I have tracked down the QueryBuilder error, and it's not a wxWindows
> error, per se. The problem lies in the
> frmQueryBuilder::OnSize() event
> handler. Basically, the QueryBuilder form receives the OnSize event
> *before* the form has been created. Here is a thread from the
> wxWindows list, discussing a similar problem a user had with
> a Windows
> application:
>
http://lists.wxwindows.org/archive/wx-users/msg05277.html

Our situation is a bit different, because the code called by
frmQueryBuilder::OnSize is wxWindows code, and not custom code,
but....here is the problem. In src/generic/laywin.cpp (from
wxWindows), the LayoutMDIFrame() function, calls the following code:

wxWindow* clientWindow = frame->GetClientWindow();

rect = event.GetRect();

clientWindow->SetSize(rect.x, rect.y, rect.width, rect.height);

Basically, frame->GetClientWindow() returns NULL, causing SetSize
(which is a macro) to cause a segfault in DoSetSize(clientWindow,
etc.). The variable 'frame' is passed to LayoutMDIFrame by our code:
LayoutMDIFrame(this).
frame->GetClientWindow() is indeed null as frame->m_clientWindow = 0x0.
I am looking for a solution to the problem, but I wanted to send it to

the list in case someone could fix it faster than I could.

ahp