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From: jason@ux1.cso.uiuc.edu (Jason)
Newsgroups: comp.sys.mac.programmer
Subject: Re: How Can I install a VBL Task from an INIT?
Message-ID: <1990Sep6.182348.567@ux1.cso.uiuc.edu>
Date: 6 Sep 90 18:23:48 GMT
References: <1900@mountn.dec.com>
Organization: University of Illinois at Urbana
Lines: 25

domenikos@emass.enet.dec.com (George Domenikos) writes:

>I am having problems with installing successfully a VBL Task at INIT time.
>It seems that I crash when I do 

>myVBL.vblAddr := @DoMyVBLStuff;

>where myVBL is of type VBLTask
>and DoMyVBLStuff is my procedure name containing the code I want to execute
>as VBL.

   Did you lock down the VBL code so that it wouldn't be moved or purged?
A good way to accomplish this is to compile the code for DoMyVBLStuff into a
resource, say of type 'task'.  Your init should:

	1) Load the 'task' code using GetResource()
	2) move the code to the top of the heap ( MoveHHi() )
	3) HLock the code.
	4) Get a pointer to the code using:
		myVBL.vblAddr = StripAddress( codeHandle^ );
-- 

                       |  |    |====================|
                       |  |    | Jason Watts        |
                     \ |\ |\ \ | (jazzin@uiuc.edu)  |