Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!mitchell
From: mitchell@cbmvax.commodore.com (Fred Mitchell - Product Assurance)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Problem with Menu Events
Keywords: Menu Events
Message-ID: <14095@cbmvax.commodore.com>
Date: 30 Aug 90 16:38:31 GMT
References: <906@augean.ua.OZ.AU>
Reply-To: mitchell@cbmvax (Fred Mitchell - Product Assurance)
Organization: Commodore, West Chester, PA
Lines: 74

In article <906@augean.ua.OZ.AU> e4ajwake@augean.ua.OZ.AU (Wakefield) writes:
>Dear Gurus, (or similar)
>
>I have a problem with intuition returning the address of a menu item when
>the item causes an event.  The code that I am using is shown below, cut down
>of course.
>
>The file "menu.h" contains all the menu and screen etc structures required to
>run the program.  I have previously been using the class & code fields to
>extract the menu item, and used switch statements to recover the menu item
>and call the apporpriate function (replaced here by printf's).
>
>However it seems that it should be possible to use the code outlined below to
>do this more efficently and simply.
>
>The problem:
>
>The address field of the message structure is alays ZERO!!!
>
>Questions:
>
>Is what I am trying to do possible ?
>Has anyone out there done this before ?
>Does anyone have some sample code ?
>Is there a simple solution ?
>
>Now the code...
>
>
>#include "menu.h"
>
>void HandleEvent();
>
>main()
>
>{
>   APTR address;
>   struct IntuiMessage *message;
>
>   for(;;) {
>      Wait(1L << MyWindow1->UserPort->mp_SigBit);
>
>      while(message = (struct IntuiMessage *)
>                         GetMsg(MyWindow1->UserPort))
>         {
>            address = message->IAddress;
>            ReplyMsg(message);
>            HandleEvent(address);
>         }
>   }

The way to get the address of the MenuItem structure is to
take the Menu number returned in the Code field and call
ItemAddress() as follows:

	struct MenuItem *mi;
		...

	mi = ItemAddress(yourMenuStrip, message->Code);
		...

Also, you'll want to check the NextSelect field in your MenuItem to see
if there are any other selections:

	while (mi->NextSelect != MENUNULL) {
		mi = ItemAddress(yourMenuStrip, mi->NextSelect)
		...process it...
		}

And that should do the trick for you.

-Mitchell

Yes, I remember my first taste of Intuition...