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From: spencer@cgrg.ohio-state.edu (Stephen N. Spencer)
Newsgroups: comp.sys.mac.programmer
Subject: CDEF Woes...
Message-ID: <1435@gertie.osc.edu>
Date: 25 Feb 91 17:56:23 GMT
Sender: spencer@osc.edu
Distribution: na
Organization: OSU Advanced Computing Center for the Arts and Design
Lines: 56

I've been experimenting with writing CDEF (Control Definitions) for a few
custom-type controls (an ICON button, a floating-point slider), and have
run into a problem.  

First, the setup:  Since I want debugging messages from the CDEF, I'm not 
compiling it as a CODE resource and linking it into my tester application.
(I have two windows in my tester app: a drawing window, and a TextEdit window.
I have an 'AddMessage()' function which takes a character string and appends
it to the TextEdit window -- instant scrolling debugging message window!)

I'm doing the following to associate my control with the control handle:
First, I make the window, set the port, and call my setup function:

	gDrawWindow = NewWindow(....blah blah....);
	SetPort(gDrawWindow);
	SetupCDEF(gDrawWindow);

Here's the setup function:

SetupCDEF(win)
	WindowPtr win;
{
	Rect r;
	Handle h;

	h = NewHandle(h);
	*h = (Ptr)MyControl;   /* MyControl() is my CDEF 'main' function. */
	SetRect(&r, 160, 30, 400, 60);
	myCH = NewControl(win, &r, "\p", TRUE, 0, 50, 100, scrollBarProc, 0L);

	HLock(myCH);
	(*myCH)->contrlDefProc = myH;
	HUnlock(myCH);
}

This works, to a point.  'MyControl' intercepts all 'drawCntl' and 'testCntl'
messages passed through the control handle 'myCH', I'm glad to report, but
where it messes up is that I don't get any 'initCntl' message(s) at all.

I could, of course, compile this CDEF into a stand-alone CODE resource and 
use ResEdit to paste it into the test application, making the requisite changes
to the 'NewControl' statement, (I know how to do that).

I don't want to, however.  I want to see debugging messages.  Is there SOME
way to link a CDEF function to a control handle so that it can be compiled in
together with the testing application? 

Thanks in advance for any help anyone out there can provide.  When these CDEFs
are finished, I will post them to the 'net:  I'm sure they would be useful.

Stephen N. Spencer     |"Now you must dance the dance that you imply!
ACCAD   (614) 292-3416 | Your actions will follow you full circle round,
The Ohio State Univ.   | The higher the leap, I said, 
1224 Kinnear Road      | The harder the ground!"
Columbus, OH 43212-1163|		- Amy Ray, "Center Stage"
spencer@cgrg.ohio-state.edu||71160.3141@compuserve.com||stephen_spencer@osu.edu