Path: utzoo!utgpu!attcan!uunet!husc6!bbn!bbn.com!dtani
From: dtani@bbn.com (Dan Tani)
Newsgroups: comp.sys.mac.programmer
Subject: AARRGG! Need help with OpenPicture()
Message-ID: <31922@bbn.COM>
Date: 7 Nov 88 14:44:06 GMT
Sender: news@bbn.COM
Reply-To: dtani@BBN.COM (Dan Tani)
Organization: Bolt Beranek and Newman Inc., Cambridge MA
Lines: 43

Hi, 
I've got a programming problem that is driving me up the wall. I am
programming in LSC 3.0 and I want to be able to export some drawings
via the clipboard.  I wrote this subroutine and I use all the standard
include files.  First, here's the code:

PicToClip()
{
	Rect		testRect;
	extern PicHandle	ClipPic;

	SetRect(&testRect,0,0,200,200);
	ClipPic = OpenPicture(&testRect);
	HLock(ClipPic);
	/* my drawing calls*/
	ClosePicture();
	ZeroScrap();
	PutScrap(GetHandleSize(ClipPic),'PICT', *ClipPic);
	HUnlock(ClipPic);
	KillPicture(ClipPic);
}

The problem is that OpenPicture(&testRect) doesn't change ClipPic  -
it returns a handle of 0x0000 which crashes everything.  The Rect gets
set correctly, and I even tried putting a ClipRect(&testRect) right
before the OpenPicture call like IM 1 suggests - and got even more
problems!  That returned an odd address error right at the ClipRect
call.

This seems very simple.  The PutScrap part works great - I had it
write a PICT from a resource, and everything worked fine. 

Also, are there any other things I should look out for while drawing
picture?  I assume that any SetPorts should be avoided, but I'm just
calling some routines that I use to draw to the screen and to the
printer.

Any help is appreciated!  I'll post a summary if there is interest.

Thanks in advance,

Dan Tani
DTANI@BBN.COM