Re: Howto handle win32 messages ?

[Aurelien Minet <a minet prim-time fr>]

Hi Tor,

Thanks for your reply,

Tor Lillqvist wrote:

> Aurelien Minet writes:
> > My new to GTK on WIN32 , and I want want to know how I can setup a 
> > callback for handling windows messages (or DLL messages of which I know 
> > the number ).  I know that in win32 programming the WindowProc callback 
> > is set with WNDCLASSEX wc; wc.lpfnWndProc = WindowProc; createwindows 
> > ..  but it isn't possible in a GTK programme.
> > So what can I do ?
>
> The answer should be to use gdk_window_add_filter() with a NULL window
> to get a look at all the window messages for all windows before GDK
> does, but I just noticed that this isn't implemented in the Win32
> backend in 2.2.1... Will be in 2.2.2, seems pretty straightforward to
> handle in the same way as the X11 backend does.
>
> Until you have a version that correctly implements
> gdk_window_add_filter(), I think you have to use
> gdk_display_add_client_message_filter(), but then you have to call
> that for each message number you want to handle.
>
> > I found GIOWin32Channel and GIOWin32ChannelType (
> > G_IO_WINDOWS_MESSAGES),
>
> Those are internal to GLib, not visible to user programs.
>
> If you were writing a non-GTK-program, you could use the
> G_WIN32_MSG_HANDLE "pseudo file descriptor" in a GPollFD and pass that
> to g_source_new(), but as GDK already does that, you can't.
>
> --tml
>
>
>  

But  I got a solution (not a very clean one), which is  :
Get the HWDN of the GTK main windows  with GDK_WINDOW_HWND .
Next  do a GetWindowLong to have the pointer of the actual WindowProc.
And finaly SetWindowLong in order to replace the actual WindowProc by my 
own WindowsProc that handle win32 messages I want and others with the 
old WindowProc.I haven't try it .


Regards

Aurelien


PS :   may gdk_window_add_filter() is out with the 2.2.2