Path: utzoo!attcan!uunet!cs.utexas.edu!rice!uw-beaver!Teknowledge.COM!unix!mxmora
From: mxmora@unix.SRI.COM (Matt Mora)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Using a handle to get data: How?
Message-ID: <13990@unix.SRI.COM>
Date: 9 Jul 90 20:10:55 GMT
References: <1990Jul8.171009.1@mel.cipl.uiowa>
Reply-To: mxmora@unix.UUCP (Matt Mora)
Organization: SRI International, Menlo Park, CA
Lines: 39
Keywords:blockmove

In article <1990Jul8.171009.1@mel.cipl.uiowa> wolf@mel.cipl.uiowa writes:


[stuff deleted]

I gathered from your post that you obtained the handle from the resource
manager with success.

>Basically what I want to know is how to use a handle to get a value of a
>certain byte at a specified offset from the handle.
>
>If someone could enlighten me on this I would be very appreciative.  I am will
>take responses in pascal (I am using turbo at the time).

Try something like this:

 function GetByteFromHandle (TheHandle: Handle; offset: longint): Byte;
  var
   temp: byte;
 begin
  BlockMove(ptr(ord(TheHandle^) + offset), @temp, 1);
  GetByteFromHandle := temp;
 end;


Blockmove is not listed as a trap that might move memory so you can
probably get away with not locking down the handle before you call
this routine.


>Thanks
>WOLF@MEL.CIPL.UIOWA.EDU


-- 
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Matthew Mora                |   my Mac  Matt_Mora@sri.com
SRI International           |  my unix  mxmora@unix.sri.com
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