Windows message in wxwidgets help?

[rozni yusof]

Thank you! It works now... though I confess to being a bit puzzled by it.

On 7/3/07, Arne Steinarson <asteinarson at yahoo.se> wrote:
>
> Change:
>
> >     else ptrWindow->MSWWindowProc(message, wParam,
> > lParam); // I think it's
> > this line?
>
> to:
>
>   else MSWWindowProc(message, wParam, lParam);
>
> But better still is to understand why this is done.
>
> // ATS
>
>
> --- rozni yusof <rozniy at gmail.com> skrev:
>
> > I think I sort of understand... I haven't had many
> > occasions to use
> > Polymorphism.
> >
> > What might be wrong with my code here? I'm getting
> > memory error when I try
> > to run the program.:
> >
> > wxDialog *ptrWindow;
> >
> > bool FreqDlgApp::OnInit()
> > {
> >     FreqDlg* dialog =3D new FreqDlg(NULL);
> >
> >     ptrWindow =3D dialog;
> >
> >     SetTopWindow(dialog);
> >     dialog->Show(true);
> >     return true;
> > }
> >
> > WXLRESULT FreqDlg :: MSWWindowProc(WXUINT message,
> > WXWPARAM
> > wParam, WXLPARAM lParam)
> > {
> >       float Freq=3D0;
> >
> >    if (message =3D=3D OLDA_WM_MEASURE_DONE)
> >      {
> >        Freq =3D LongToFreq (lParam);
> >        wxLogMessage("Message");
> >       //and some other stuff
> >      }
> >
> >     else ptrWindow->MSWWindowProc(message, wParam,
> > lParam); // I think it's
> > this line?
> >
> >
> > }
> >
> >
> >
> >
> >
> >
> > On 7/3/07, Arne Steinarson <asteinarson at yahoo.se>
> > wrote:
> > >
> > > It's not trivial. This function is central for
> > message
> > > processing on wxW...
> > >
> > > Looking at wxWidgets source for wxMSW one can
> > > understand how this works. If you override this
> > > function, it is _very_ important to call the base
> > > class version, otheriwse things will stop working.
> > >
> > > Regards
> > > // ATS
> > >
> > >
> > > --- rozni yusof <rozniy at gmail.com> skrev:
> > >
> > > > Sorry to bother you guys again, but everything
> > I've
> > > > done witht the
> > > > MSWWindowProc causes the program to freeze while
> > > > loading (except when I put
> > > > exit(1) in it!). I'm just not getting something
> > here
> > > > which people consider
> > > > trivial, 'cos Googling 4 pages for "override
> > > > MSWWindowProc" didn't help!
> > > >
> > > > On 7/2/07, Arne Steinarson
> > <asteinarson at yahoo.se>
> > > > wrote:
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > You have to override virtual func:
> > > > > >
> > > > > > wxWindow::MSWWindowProc(WXUINT message,
> > WXWPARAM
> > > > > > wParam, WXLPARAM lParam);
> > > > > >
> > > > > > Regards
> > > > > > // Arne S.
> > > > > >
> > > > > >
> > > > > > --- rozni yusof < rozniy at gmail.com> skrev:
> > > > > >
> > > > > > > I went right into wxWidgets right after
> > > > learning
> > > > > > > C++. Now I need to process
> > > > > > > a Windows Message in my wxWidgets app,
> > which
> > > > the
> > > > > > > wxWidgets FAQ says is
> > > > > > > indeed possible... but I'm a bit clueless,
> > > > having
> > > > > > > skipped Win32 programming
> > > > > > > (or MFC for that matter) to go wx.
> > > > > > >
> > > > > > > I take it wxWindow::GetHWND() (suggested
> > by
> > > > the
> > > > > > > wxWidgets FAQ)has been
> > > > > > > superceeded by wxWindow::GetHandle? For
> > > > GetHWND() is
> > > > > > > nowhere in my wxWidgets
> > > > > > > 2.6.2 Manual.
> > > > > > >
> > > > > > > I would need to override a virtual
> > > > MSWWindowProc()
> > > > > > > method in a
> > > > > > > wxWindow-derived class, says the FAQ?
> > Then,
> > > > "You
> > > > > > > should then test if
> > > > > > > nMsgparameter is the message you need to
> > > > process and
> > > > > > > perform the
> > > > > > > necessary
> > > > > > > action if it is or call the base class
> > method
> > > > > > > otherwise."
> > > > > > >
> > > > > > > It's that Data Acquisition card thing
> > again,
> > > > which
> > > > > > > I'm trying to turn into a
> > > > > > > pulse-frequency measurer...
> > > > > > >
> > > > > > > To quote:
> > > > > > > Use the olDaMeasureFrequency function to
> > > > specify the
> > > > > > > duration
> > > > > > > of the Windows timer (which has a
> > resolution
> > > > of 1
> > > > > > > ms) and to
> > > > > > > start the frequency measurement operation.
> > > > (OK...)
> > > > > > >
> > > > > > > When the operation is complete, the
> > > > > > > OLDA_WM_MEASURE_DONE message is generated.
> > Use
> > > > the
> > > > > > > LongtoFreq (lParam) macro, described in
> > the
> > > > DataAcq
> > > > > > > SDK
> > > > > > > online help, to get the measured frequency
> > > > value.
> > > > > > >
> > > > > > >
> > > > > > > I'm OK with all the preceding steps... now
> > I
> > > > need to
> > > > > > > catch this Windows
> > > > > > > Message!
> > > > > > >
> > > > > >
> > > > > >
> > > > > > - - -
> > > > > >
> > > > > >
> > > > > >
> > > >
> > >
> >
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