SV: Re: Windows message in wxwidgets help?

[Arne Steinarson]

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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> > >
>
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> > >
> >
> 


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