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From: stoms@castor.ncgia.ucsb.edu (David Stoms)
Newsgroups: comp.sys.mac.programmer
Subject: Re: control definition functions without CDEFs?
Message-ID: <4299@hub.UUCP>
Date: 13 Mar 90 16:43:44 GMT
References: <423@fornax.UUCP> <8013@tank.uchicago.edu> <10098@portia.Stanford.EDU>
Sender: news@hub.UUCP
Reply-To: stoms@castor.ncgia.ucsb.edu (Josh Pritikin)
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Organization: U. C. Santa Barbara, Geography Department
Lines: 22

In article <10098@portia.Stanford.EDU> duggie@jessica.Stanford.EDU (Doug Felt) writes:
>In article <8013@tank.uchicago.edu> asl2@tank.uchicago.edu (Aaron "Fish" Lav) writes:
>>In article <423@fornax.UUCP> mcdonald@fornax.UUCP (Ken Mcdonald) writes:
>>>I'm writing up a bit of source which, eventually, I'd like to distribute.  It
>>>uses custom CDEFs, but one thing I'd like to do is to avoid making users
>>>of the source copy extra CDEFs into their applications--that is, I'd like
>>>to build the custom controls entirely within the source.  The first
>>What you want to do is allocate a six-byte handle, and fill that with a jump
>>to your procedure's address.  There was a Mactutor example of how to do this
>Make sure, by the way, that the procedure is in a segment that will stay
>locked while the control is in use.

One more hint-- you should create the control by specifying a real
CDEF resource. To accomplish this, you can use ResEdit or something
to create a six byte CDEF handle on disk. Then do a GetResource and
put in your JMP and address. I don't think your code needs to be in
a locked segment, at least in ThinkC because when you take the address
of a routine I think you get a pointer to a branch to that routine.
At least I think it works like that in ThinkC. Try it, if I'm wrong
correct me but I seem to remember doing it before.

Josh Pritikin