Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!iroquois.cis.ohio-state.edu!topping
From: topping@iroquois.cis.ohio-state.edu (brian e topping)
Newsgroups: comp.sys.mac.programmer
Subject: Re: FSRead() limit on number of bytes
Message-ID: <82929@tut.cis.ohio-state.edu>
Date: 12 Aug 90 20:50:23 GMT
References: <1335@anaxagoras.ils.nwu.edu>
Sender: news@tut.cis.ohio-state.edu
Reply-To: brian e topping <topping@cis.ohio-state.edu>
Organization: Ohio State University Computer and Information Science
Lines: 14

In article <1335@anaxagoras.ils.nwu.edu> sandell@ils.nwu.edu (Greg Sandell) writes:
>Using FSRead() I find that I can read only a limited number of
>.... deleted....
>byteCount = 1000L;
>FSRead(fRefNum, &byteCount, (char *)data);

You might check with MacsBug what is _actually_ being passed in the
data parameter.  If data is a struct, it is going to copy the thing
onto the stack and the toolbox is going to use the first long in the
struct as a pointer to the data.  If this is true you want to change
the last param to (char *)&data instead of just (char *)data.

Brian Topping
<topping@cis.ohio-state.edu>