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From: tedj@hpcid.HP.COM (Ted Johnson)
Newsgroups: comp.sys.mac
Subject: Help wanted: LSC, MacPaint
Message-ID: <3320023@hpcid.HP.COM>
Date: Mon, 28-Sep-87 17:38:27 EDT
Article-I.D.: hpcid.3320023
Posted: Mon Sep 28 17:38:27 1987
Date-Received: Wed, 30-Sep-87 06:42:21 EDT
Lines: 115


The following 90 line program is my attempt at using a SFGetFile dialog
to select a MacPaint file, and then using CopyBits to display the file
on the Mac's screen.  This program is meant to be a Lightspeed C version
of Technical Note #86, which gave a Pascal example for reading a MacPaint
file.

Unfortunately, this program displays junk (it looks like "snow" on a
TV screen) on the Mac's screen instead of the MacPaint picture.  Any clues
as to where I'm going wrong would be greatly appreciated!  (I suspect that
my syntax in calling CopyBits() is wrong...)

	-Ted
P.S. I am using LSC 2.01, upgraded to 2.11, on a SE HD20 running
     System/Finder 4.1/5.5.

******************************************************************
Ted C. Johnson
Hewlett-Packard, Design Technology Center
Santa Clara, CA
(408)553-3555
UUCP: hplabs!hpcea!hpcid!tedj
******************************************************************

/*---------------------------cut here-------------------------------*/

/*For the sake of brevity, I have omitted all the manager "#include"s,
  the comments, and the error message handling.*/

#define YES 		1
#define NIL 		0L
#define DefaultVolume 	0
#define MaxFileSize	51840

SFReply theReply;
Point SFGetwhere = { 90, 82 };
Ptr srcPtr, dstPtr, saveDstPtr;
int srcFile, scanLine, errCode, vRef, refNum;
long srcSize;
GrafPort aPort;
BitMap theBitMap;
Rect screen;
char buffer[1000];
Str255 fn;

main()
{
	InitGraf(&thePort);
	
	if (OldFile(&fn, &vRef) != YES) ExitToShell();
        		
	srcPtr = NewPtr(MaxFileSize);
	if (srcPtr == NIL) ExitToShell(); 
	
	errCode = FSOpen(&fn, vRef, &refNum);
	if (errCode != noErr) ExitToShell();
	
	srcSize = 512;
	errCode = FSRead(refNum, &srcSize, srcPtr);
	if (errCode != noErr) ExitToShell();
	
	errCode = GetEOF(refNum, &srcSize);
	if (errCode != noErr) ExitToShell();
	
	srcSize = srcSize - 512;
	
	errCode = FSRead(refNum, &srcSize, srcPtr);
	if (errCode != noErr) ExitToShell(); 
	
	errCode = FSClose(refNum);
	if (errCode != noErr) ExitToShell(); 
	
	dstPtr = NewPtr(MaxFileSize);
	
	if (dstPtr == NIL) ExitToShell(); 
	
	saveDstPtr = dstPtr;
	
	for (scanLine = 1; scanLine <= 720; scanLine++) {
		UnpackBits(srcPtr, dstPtr, 72);
	}
	
	OpenPort(&aPort);
	SetRect(&screen, 0, 0, 576, 720);
	theBitMap.baseAddr = saveDstPtr;
	theBitMap.rowBytes = 72;
	theBitMap.bounds = screen;
	CopyBits(&theBitMap, &(aPort.portBits), &(aPort.portRect), 
			 &(aPort.portRect), srcCopy, NIL);
			 
	do {
		;
	} while (!Button());
}
	
OldFile(fn, vRef)
Str255 *fn;
int *vRef;
{
SFTypeList fileTypes;
int success_flag;

	fileTypes[0] = 'PNTG';
	SFGetFile(SFGetwhere, "\pPick a paint file",
			  0L, 1, fileTypes, 0L, &theReply);
	if (theReply.good == YES) {
		pStrCopy(theReply.fName, fn);
		*vRef = theReply.vRefNum;
		success_flag = YES;
	}
	else {
		success_flag = NO;
	}
	return(success_flag);
}