Tricks of the Mac Game Programming Gurus/TricksOfTheMacGameProgrammingGurus.iso/Information/CSMP Digest/volume 1/csmp-v1-174.txt

Text File | 1994-12-08 | 47.5 KB | 1,442 lines | [TEXT/R*ch]

C.S.M.P. Digest             Sun, 04 Oct 92       Volume 1 : Issue 174

Today's Topics:

    Looking for some sample appletalk ATP code...
    MacinTalk MPW C Interfaces
    screenBits, off-screen drawing and memory allocation
    ZREF error
    Getting my hands on the real CLUT
    FSpExchangeFiles Problem
    Accepting AppleEvents?



The Comp.Sys.Mac.Programmer Digest is moderated by Michael A. Kelly.

The digest is a collection of article threads from the internet newsgroup
comp.sys.mac.programmer.  It is designed for people who read c.s.m.p. semi-
regularly and want an archive of the discussions.  If you don't know what a
newsgroup is, you probably don't have access to it.  Ask your systems
administrator(s) for details.  (This means you can't post questions to the
digest.)

Each issue of the digest contains one or more sets of articles (called
threads), with each set corresponding to a 'discussion' of a particular
subject.  The articles are not edited; all articles included in this digest
are in their original posted form (as received by our news server at
cs.uoregon.edu).  Article threads are not added to the digest until the last
article added to the thread is at least one month old (this is to ensure that
the thread is dead before adding it to the digest).  Article threads that
consist of only one message are generally not included in the digest.

The entire digest is available for anonymous ftp from ftp.cs.uoregon.edu
[128.223.8.8] in the directory /pub/mac/csmp-digest.  Be sure to read the
file /pub/mac/csmp-digest/README before downloading any files.  The most
recent issues are available from sumex-aim.stanford.edu [36.44.0.6] in the
directory /info-mac/digest/csmp.  If you don't have ftp capability, the sumex
archive has a mail server; send a message with the text '$MACarch help' (no
quotes) to [e-mail] for more information.

The digest is also available via email.  Just send a note saying that you
want to be on the digest mailing list to [e-mail], and you will
automatically receive each new issue as it is created.  Sorry, back issues
are not available through the mailing list.

Send administrative mail to [e-mail].


-------------------------------------------------------

From: [e-mail] (Alex Bratton)
Subject: Looking for some sample appletalk ATP code...
Organization: University of Illinois at Urbana-Champaign
Date: Tue, 1 Sep 1992 03:36:35 GMT

I've been doing some work with ATP, trying to get a socket opened and the
name registered.  It returns noErr, but when I examine the network from
another computer, the new socket doesn't show up.  It also produces an
error (no matching name) when I try to unregister the name.

If you have some sample code (ATP) that opens, registers, and dumps some
data, I'd really appreciate seeing it.  This has been bugging me for a while
and I think I need to look at some working code to see what I'm missing.

I'm sticking with ATP to insure system 6 & 7 compatability.

Thanks,
Alex Bratton

+++++++++++++++++++++++++++

From: [e-mail] (Stuart Cheshire)
Date: 2 Sep 92 17:58:33 GMT
Organization: Stanford University

In article <[e-mail]> Alex Bratton,
[e-mail] writes:
>If you have some sample code (ATP) that opens, registers, and dumps some
>data, I'd really appreciate seeing it.  This has been bugging me for a
while
>and I think I need to look at some working code to see what I'm missing.

Here is some sample code which includes ATP calls. It is the code I use
to obtain the list of AppleTalk zones to display in my game Bolo, and
judging by the time it took to get all the wrinkles worked out, and make
it run with both Phase 1 and Phase 2, it probably should be in some
sample code library somewhere for other people's use.

The ATP calls are in the Phase 1 part, which has to communicate directly
with the bridge via ATP.

The code gets the list of zones, sorts them into alphabetical order using
heap sort, and then appends them in order to the list identified by the
parameter "zonelist", which should be initialized before calling
getzonelist.

The code is written for Think C 5.

#include <AppleTalk.h>

#define local static
#define export
#define import extern

typedef struct
    {
    BYTE sysLAPAddr;
    BYTE destnode;
    BYTE srcnode;
    BYTE ALAPproto;
    WORD length;
    union
        {
        struct
            {
            BYTE destsocket;
            BYTE srcsocket;
            BYTE DPPproto;
            BYTE userdata[15];
            } shortheader;
        struct
            {
            WORD checksum;
            WORD destnet;
            WORD srcnet;
            BYTE destnode;
            BYTE srcnode;
            BYTE destsocket;
            BYTE srcsocket;
            BYTE DPPproto;
            BYTE userdata[7];
            } longheader;
        } u;
    BYTE unused;
    BYTE sysABridge;
    WORD sysNetNum;
    WORD vSCCEnable;
    } MPPglobals;

extern MPPglobals *ABusVars : 0x2D8;

#define        atpMaxData                578            // size of buffer for zone names
#define        kZIPSocket                6            // the Zone Information Protocol socket
#define        kATPTimeOutVal            3            // re-try ATP SendRequest every 3 seconds
#define        kATPRetryCount            5            // for five times
#define        kGZLCall                0x08000000    // GetZoneList indicator
#define        kGMZCall                0x07000000    // GetMyZone indicator
#define        kZoneCount                0x0000FFFF     // mask to count zones in buffer
#define        kNoMoreZones            0xFF000000     // mask to see if more zones to come

#define xCall               246
#define zipGetLocalZones    5
#define zipGetZoneList      6
#define zipGetMyZone        7

typedef struct
    {
    QElemPtr         qLink;
    short            qType;
    short            ioTrap;
    Ptr              ioCmdAddr;
    ProcPtr          ioCompletion;
    OSErr            ioResult;
    StringPtr        ioNamePtr;
    short            ioVRefNum;
    short            ioRefNum;
    short            csCode;
    short            xppSubCode;
    unsigned char    xppTimeOut;
    unsigned char    xppRetry;
    short            filler;
    Ptr              zipBuffPtr;
    short            zipNumZones;
    short            zipLastFlag;
    short            zipInfoField[35];
    } xCallParam;

#define MAX_ZONES 1000
typedef struct { unsigned char c[34]; } ZONE_NAME;
ZONE_NAME *zone_array, **zone_heap;
local int num_zones;

local void addtoheap(int place, ZONE_NAME *new)
    {
    int parent = (place-1)>>1;
    zone_heap[place]=new;
    while (place>0 && IUCompString(zone_heap[parent]->c,
zone_heap[place]->c)>0)
        {
        ZONE_NAME *temp   = zone_heap[place ];
        zone_heap[place ] = zone_heap[parent];
        zone_heap[parent] = temp;
        place=parent;
        parent=(place-1)>>1;
        }
    }

local ZONE_NAME *removefromheap(int last)    // last is index of last item
on heap
    {
    ZONE_NAME *top = zone_heap[0];            // extract top element
    int gap   = 0;                            // top is now empty
    int left  = 1;
    int right = 2;
    while(left<=last)                        // move gap to bottom
        {
        if(right>last || IUCompString(zone_heap[right]->c,
zone_heap[left]->c)>0)
            { zone_heap[gap]=zone_heap[left ]; gap=left;  }
        else{ zone_heap[gap]=zone_heap[right]; gap=right; }
        left  = (gap<<1)+1;
        right = left + 1;
        }
    if(last != gap) addtoheap(gap, zone_heap[last]);    // fill gap
    return(top);    // and heap is now one element smaller
    }

local void BuildZoneListPhase1(unsigned char *myzone)
    {
    ATPParamBlock    pb;
    BDSElement        dBDS;
    unsigned char    datapacket[atpMaxData];
    short            zIndex=1, zCount=0, i;

    dBDS.buffSize    = atpMaxData;
    dBDS.buffPtr     = (Ptr)datapacket;

    pb.ATPatpFlags   = 0;
    pb.ATPreqLength  = 0;
    pb.ATPreqPointer = NULL;
    pb.ATPbdsPointer = (Ptr) &dBDS;
    pb.ATPnumOfBuffs = 1;
    pb.ATPtimeOutVal = kATPTimeOutVal;
    pb.ATPretryCount = kATPRetryCount;

    pb.ATPaddrBlock.aNet    = ABusVars->sysNetNum;
    pb.ATPaddrBlock.aNode   = GetBridgeAddress();
    pb.ATPaddrBlock.aSocket = kZIPSocket;

    if (!pb.ATPaddrBlock.aNode) return;        // no bridge -- no zones

    do    {
        unsigned char *ptr = datapacket;
        pb.ATPuserData = kGZLCall + zIndex;
        PSendRequest(&pb, false);
        zCount += dBDS.userBytes & kZoneCount;
        while(zIndex++ <= zCount)
            {
            int count = 1 + *ptr;
            unsigned char *dest = zone_array[num_zones].c;
            while (count-- > 0) *dest++ = *ptr++;
            addtoheap(num_zones, &zone_array[num_zones]);
            num_zones++;
            }
        } until(dBDS.userBytes & kNoMoreZones);

    pb.ATPuserData = kGMZCall;
    datapacket[0] = 0;
    if (PSendRequest(&pb, false) == noErr && datapacket[0] &&
datapacket[0]<32)
        for (i=0; i<=datapacket[0]; i++) myzone[i] = datapacket[i];
    }

local void BuildZoneListPhase2(unsigned char *myzone)
    {
    short XPPRefNum;
    xCallParam        xpb;
    unsigned char    datapacket[atpMaxData];
    short            zIndex=1, zCount=0;

    if (OpenDriver("\p.XPP", &XPPRefNum)) return;

    xpb.zipInfoField[0] = 0;
    xpb.zipLastFlag = FALSE;
    xpb.ioRefNum    = XPPRefNum;
    xpb.csCode      = xCall;
    xpb.xppSubCode  = zipGetZoneList;
    xpb.xppTimeOut  = kATPTimeOutVal;
    xpb.xppRetry    = kATPRetryCount;
    xpb.zipBuffPtr  = (Ptr)datapacket;

    while (!xpb.zipLastFlag && !PBControl((ParmBlkPtr)&xpb, FALSE))
        {
        unsigned char *ptr = datapacket;
        zCount += xpb.zipNumZones;
        while(zIndex++ <= zCount)
            {
            int count = 1 + *ptr;
            unsigned char *dest = zone_array[num_zones].c;
            while (count-- > 0) *dest++ = *ptr++;
            addtoheap(num_zones, &zone_array[num_zones]);
            num_zones++;
            }
        }

    xpb.zipInfoField[0] = 0;
    xpb.xppSubCode  = zipGetMyZone;
    xpb.zipBuffPtr  = (Ptr)myzone;
    PBControl((ParmBlkPtr)&xpb, FALSE);
    // Mustn't close XPP driver (see IM V 532)
    }

local short addrow(ListHandle list, unsigned char *newdata)
    {
    Point pt = { 0, 0 };
    pt.v = (*list)->dataBounds.bottom;
    LAddRow(1, pt.v, list);
    LSetCell(newdata+1, newdata[0], pt, list);
    return(pt.v);
    }

export int getzonelist(ListHandle zonelist)
    {
    unsigned char myzone[33];
    Point pt = { 0, 0 };
    SysEnvRec sysenvirons;
    SysEnvirons(1, &sysenvirons);
    zone_array = (ZONE_NAME  *) NewPtr(MAX_ZONES * sizeof(ZONE_NAME  ));
    zone_heap  = (ZONE_NAME **) NewPtr(MAX_ZONES * sizeof(ZONE_NAME *));
    myzone[0] = num_zones = 0;
    if (sysenvirons.atDrvrVersNum < 53) BuildZoneListPhase1(myzone);
    else                                BuildZoneListPhase2(myzone);

    while (num_zones-->0) addrow(zonelist, removefromheap(num_zones)->c);
    DisposPtr((Ptr)zone_array);
    DisposPtr((Ptr)zone_heap);

    LSearch(myzone+1, *myzone, NULL, &pt, zonelist);
    LSetSelect(TRUE, pt, zonelist);
    LAutoScroll(zonelist);
    return(pt.v);
    }


Stuart Cheshire <[e-mail]>
 * Liliore Green Rains Houses Resident Computer Coordinator
 * Stanford Distributed Systems Group Research Assistant
 * Macintosh Programmer

+++++++++++++++++++++++++++

From: Stuart Cheshire <[e-mail]>
Organization: Stanford University
Date: Wed, 2 Sep 92 18:11:08 GMT

In article <[e-mail]> Alex Bratton,
[e-mail] writes:
>If you have some sample code (ATP) that opens, registers, and dumps some
>data, I'd really appreciate seeing it.  This has been bugging me for a
while
>and I think I need to look at some working code to see what I'm missing.

Here is some more sample code, which opens and registers an ATP socket.
It is from the Macintosh User Authenticator mentioned in a previous post
be me.

The code is written for Think C 5.

#include <Traps.h>
#include <GestaltEqu.h>
#include <Folders.h>
#include <AppleTalk.h>

#define local static
#define export
#define import extern
typedef unsigned char  BYTE;
typedef unsigned short WORD;
typedef unsigned long  DWORD;
#define until(A) while (!(A))

typedef struct
    {
    BYTE sysLAPAddr;
    BYTE destnode;
    BYTE srcnode;
    BYTE ALAPproto;
    WORD length;
    union
        {
        struct
            {
            BYTE destsocket;
            BYTE srcsocket;
            BYTE DPPproto;
            BYTE userdata[15];
            } shortheader;
        struct
            {
            WORD checksum;
            WORD destnet;
            WORD srcnet;
            BYTE destnode;
            BYTE srcnode;
            BYTE destsocket;
            BYTE srcsocket;
            BYTE DPPproto;
            BYTE userdata[7];
            } longheader;
        } u;
    BYTE unused;
    BYTE sysABridge;
    WORD sysNetNum;
    WORD vSCCEnable;
    } MPPglobals;

extern MPPglobals *ABusVars : 0x2D8;

typedef struct
    {
    ATPParamBlock p;
    long *myglobals;
    } myATPParamBlock;

local NamesTableEntry myNTE;    /* DONT TOUCH THIS -- IT'S USED CONTINUOUSLY
BY NBP */

// name must be 8 characters long
local void construct_name(AddrBlock addr, unsigned char *name)
    {
    static unsigned char hextable[] = "0123456789ABCDEF";
    name[0] = 7;
    name[1] = hextable[(addr.aNet  >> 12) & 0xF];
    name[2] = hextable[(addr.aNet  >>  8) & 0xF];
    name[3] = hextable[(addr.aNet  >>  4) & 0xF];
    name[4] = hextable[(addr.aNet  >>  0) & 0xF];
    name[5] = '.';
    name[6] = hextable[(addr.aNode >>  4) & 0xF];
    name[7] = hextable[(addr.aNode >>  0) & 0xF];
    }

local void awaitrequest(void);
local void acceptrequest(void)
    {
    static char dummy;
    static BDSElement bds;

    myATPParamBlock *atp_pb;
    long *saveGptr;
    asm    {    move.l    GLOBREG, saveGptr
            move.l    a0, atp_pb
            move.l    myATPParamBlock.myglobals(a0), GLOBREG
        }

    // if (atp_pb->p.ATPioResult) What to do if error?

// do whatever you want here to prepare your response...

    bds.buffSize  = sizeof(dummy);
    bds.buffPtr   = (Ptr)&dummy;
    bds.dataSize  = 0;
    bds.userBytes = 0;

    atp_pb->p.ATPioCompletion = awaitrequest;
    atp_pb->p.ATPatpFlags   = atpEOMvalue;
    atp_pb->p.ATPbdsPointer = (Ptr)&bds;
    atp_pb->p.ATPnumOfBuffs = 1;
    atp_pb->p.ATPbdsSize    = 1;

    PSendResponse(&atp_pb->p, TRUE);

    asm { move.l saveGptr, GLOBREG }
    }

local void awaitrequest(void)
    {
    static MACAUTH_REQUEST req;
    myATPParamBlock *atp_pb;
    long *saveGptr;
    asm    {    move.l    GLOBREG, saveGptr
            move.l    a0, atp_pb
            move.l    myATPParamBlock.myglobals(a0), GLOBREG
        }
    atp_pb->p.ATPioCompletion = acceptrequest;
    atp_pb->p.ATPatpSocket    = myNTE.nt.nteAddress.aSocket;
    atp_pb->p.ATPreqLength    = sizeof(req);
    atp_pb->p.ATPreqPointer   = (Ptr)&req;
    PGetRequest(&atp_pb->p, TRUE);
    asm { move.l saveGptr, GLOBREG }
    }

local OSErr AppleTalkInit(void)    // returns non-zero if init failed
    {
    OSErr retcode;
    short MPPRefNum;
    MPPParamBlock p;
    ATPParamBlock atp;
    static myATPParamBlock req_pb;
    static AddrBlock zeroaddress;
    static unsigned char regname[8];

    if (retcode = OpenDriver("\p.MPP", &MPPRefNum))
        { DebugStr("\pCouldn't open AppleTalk driver"); return(retcode); }

    p.SETSELF.newSelfFlag = TRUE;
    PSetSelfSend(&p, FALSE);     // no need to abort if this fails

    atp.ATPatpSocket = 0;
    atp.ATPaddrBlock = zeroaddress;
    if (retcode = POpenATPSkt(&atp, FALSE))
        { DebugStr("\pCouldn't open ATP socket"); return(retcode); }

    myNTE.nt.nteAddress.aNet    = ABusVars->sysNetNum;
    myNTE.nt.nteAddress.aNode   = ABusVars->sysLAPAddr;
    myNTE.nt.nteAddress.aSocket = atp.ATPatpSocket;

    construct_name(myNTE.nt.nteAddress, regname);

    NBPSetNTE((Ptr)&myNTE,
        (Ptr)regname, (Ptr)"\pMacintosh Authenticator", (Ptr)"\p*",
        myNTE.nt.nteAddress.aSocket);

    p.NBPinterval    = 2;
    p.NBPcount       = 2;
    p.NBPntQElPtr    = (Ptr)&myNTE;
    p.NBPverifyFlag  = TRUE;
    if (retcode = PRegisterName(&p, FALSE))
        { DebugStr("\pCouldn't Register name"); return(retcode); }

    asm    {    move.l    GLOBREG, req_pb.myglobals
            lea        req_pb, a0
            bsr        awaitrequest
        }
    }


Stuart Cheshire <[e-mail]>
 * Liliore Green Rains Houses Resident Computer Coordinator
 * Stanford Distributed Systems Group Research Assistant
 * Macintosh Programmer

---------------------------

From: [e-mail] (Shawn James Cokus)
Subject: MacinTalk MPW C Interfaces
Date: 1 Sep 92 06:33:27 GMT
Organization: Sophomore, Math/Computer Science, Carnegie Mellon, Pittsburgh, PA


After searching far and wide on Developer CD's (well, just the one I
have access to, Vol. X) and Archie FTP servers, I have been at a total
loss to find a header file for MacinTalk for MPW C and the (I believe)
accompanying glue/library code that goes along with it.  If anyone could
tell me where to get such a beast, or even point me to some C interfaces
that I could convert to MPW C form, it would be most appreciated.

Thanks,
- --Shawn.
- [e-mail].


- -- Shawn Cokus
- --   [e-mail]
- --   Carnegie-Mellon University, Pittsburgh, PA
- --   (Witty phrase temporarily out of order.)

+++++++++++++++++++++++++++

From: [e-mail] (Kent Sandvik)
Date: 2 Sep 92 00:35:08 GMT
Organization: Apple

In article <[e-mail]>, [e-mail] (Shawn
James Cokus) wrote:
>
>
> After searching far and wide on Developer CD's (well, just the one I
> have access to, Vol. X) and Archie FTP servers, I have been at a total
> loss to find a header file for MacinTalk for MPW C and the (I believe)
> accompanying glue/library code that goes along with it.  If anyone could
> tell me where to get such a beast, or even point me to some C interfaces
> that I could convert to MPW C form, it would be most appreciated.

The headers were shipped with the ADPA product. Macintalk does not
run well under System 7 (especially with VM on), however there are
hackers who have gone around the problems (like the Moose developers).

The official DTS message is "stay tuned for something better".

Kent Sandvik/DTS

---------------------------

From: Jerome Chan <[e-mail]>
Subject: screenBits, off-screen drawing and memory allocation
Organization: Alethea, The Twilight World!
Date: Wed, 15 Jul 92 16:51:21 GMT

  In the case of multiple monitors, how do I get their various dimensions
and locations? Does screenBits.bounds contain a RECT that includes all
monitors available? I want to draw into an off-screen area but I don't
want to draw onto another monitor for multi-monitor configurations. I
don't have the hardware to test this. :)

  When a system trap causes memory to be compacted, only the current
application's heap zone is affected right?


- --NewBie Mac Programmer at Large--
- --Day 3 and Still Going

- ---
 Fading

"No Lah! Sure or not one? Dunno leh! Nebber Mind! Like that one!
Terriblur Lah!"

+++++++++++++++++++++++++++

From: [e-mail]
Organization: Actrix Information Exchange
Date: Thu, 16 Jul 1992 04:27:11 GMT

In article <[e-mail]> Jerome Chan <[e-mail]> writes:
>   In the case of multiple monitors, how do I get their various dimensions
> and locations? Does screenBits.bounds contain a RECT that includes all
> monitors available?

Yes.  The GrayRgn is even better, since it is the real shape.


>I want to draw into an off-screen area but I don't
> want to draw onto another monitor for multi-monitor configurations. I
> don't have the hardware to test this. :)

Offscreen bitmaps exist in a completely diferent coordinate system
to the real screens.  You don't have to worry about them colliding.


>   When a system trap causes memory to be compacted, only the current
> application's heap zone is affected right?


Yes.

- --
[e-mail]   Twisted pair: [phone]
BIX: brucehoult                 Last Resort:  PO Box 4145 Wellington, NZ
"Cray's producing a 200 MIPS personal computer with 64MB RAM and a 1 GB
hard disk that fits in your pocket!"   "Great!  Is it PC compatable?"

+++++++++++++++++++++++++++

From: [e-mail] (Humayun Lari)
Date: 17 Jul 92 02:55:23 GMT
Organization: University of North Carolina, Chapel Hill

In article <[e-mail]> [e-mail] writes:
>In article <[e-mail]> Jerome Chan <[e-mail]> writes:
>>   In the case of multiple monitors, how do I get their various dimensions
>> and locations? Does screenBits.bounds contain a RECT that includes all
>> monitors available?
>
>Yes.  The GrayRgn is even better, since it is the real shape.

If I remember correctly, screenBits.bounds is the rectangle of the main
screen -- it doesn't enclose all monitors. Otherwise, programs that create
or center windows based on screenBits.bounds would do rather strange things.
:-)

Humayun Lari
([e-mail])

+++++++++++++++++++++++++++

From: [e-mail] (Grobbins)
Date: 18 Jul 92 02:04:00 GMT
Organization: Core Technical Support

In article <[e-mail]> [e-mail] writes:
>In article <[e-mail]> Jerome Chan <[e-mail]> writes:
>>   In the case of multiple monitors, how do I get their various dimensions
>> and locations? Does screenBits.bounds contain a RECT that includes all
>> monitors available?
>Yes.  The GrayRgn is even better, since it is the real shape.

As Humayun Lari pointed out, screenBits.bounds is the rect of the
main device.  The rgnBBox of the GrayRgn bounds all screens (minus the
menu bar; see the graphic devices chapter of Inside Mac vols. V and VI
for details on the multiple monitor environment.)  Sample code for
walking the GDevice list (to get the rect or bit depth of each screen,
for example) is in the Q&A Stack (available on ftp.apple.com in the
/dts/mac/docs/stacks/ directory.)

>>I want to draw into an off-screen area but I don't
>> want to draw onto another monitor for multi-monitor configurations. I
>> don't have the hardware to test this. :)

Under System 7, GWorlds are definitely the way to go.  See IM VI, ch 21.

>>   When a system trap causes memory to be compacted, only the current
>> application's heap zone is affected right?
>Yes.

Remember that toolbox calls may use Temp Memory these days, so potentially
the process manager heap and the system heap could get shuffled by any
call which "moves memory."  Program defensively.


Grobbins             [e-mail]

Usual disclaimers apply.


+++++++++++++++++++++++++++

From: Jerome Chan <[e-mail]>
Organization: Alethea, The Twilight World!
Date: Sat, 18 Jul 92 05:42:58 GMT

In article <[e-mail]> Grobbins, [e-mail] writes:
>As Humayun Lari pointed out, screenBits.bounds is the rect of the
>main device.  The rgnBBox of the GrayRgn bounds all screens (minus the

  So I should get use the bounding rectangle of CURRENT graphics device
if I want to perform screen calculations? And the bounding box of GrayRgn
for a DragWindow call? screenBits can't be used if I want to drag over
several monitors? (* I don't have the HardWare to test :( *)

- ---
 Fading

"No Lah! Sure or not one? Dunno leh! Nebber Mind! Like that one!
Terriblur Lah!"

+++++++++++++++++++++++++++

From: [e-mail] (Humayun Lari)
Date: 18 Jul 92 16:52:29 GMT
Organization: University of North Carolina, Chapel Hill

In article <[e-mail]> [e-mail] (Jerome Chan) writes:
>  So I should get use the bounding rectangle of CURRENT graphics device
>if I want to perform screen calculations?

If you want the main screen, use screenBits.bounds; if you want a particular
screen, you should walk the GDevice list and find the screen's rectangle.

>And the bounding box of GrayRgn
>for a DragWindow call? screenBits can't be used if I want to drag over
>several monitors? (* I don't have the HardWare to test :( *)

If you specify screenBits.bounds as the limit for DragWindow, the Window
Manager is smart enough to use the GrayRgn bounds instead.


Humayun Lari
([e-mail])

+++++++++++++++++++++++++++

From: [e-mail] (Keith Rollin)
Date: 18 Jul 92 20:30:25 GMT
Organization: Taligent

In article <[e-mail]>, [e-mail] (Jerome
Chan) writes:
>
> In article <[e-mail]> Grobbins, [e-mail] writes:
> >As Humayun Lari pointed out, screenBits.bounds is the rect of the
> >main device.  The rgnBBox of the GrayRgn bounds all screens (minus the
>
>   So I should get use the bounding rectangle of CURRENT graphics device
> if I want to perform screen calculations? And the bounding box of GrayRgn
> for a DragWindow call? screenBits can't be used if I want to drag over
> several monitors? (* I don't have the HardWare to test :( *)

While passing a copy of the bounding box of grayRgn to DragWindow is the
"proper" thing to do, passing screenBits.bounds is also OK. See the description
of DragGrayRgn (which DragWindow calls (see IM I-289)) in Inside Mac V.

- --
Keith Rollin
Phantom Programmer
Taligent, Inc.


---------------------------

From: [e-mail] (SCOTT I CHASE)
Subject: ZREF error
Date: 19 Jul 92 20:39:37 GMT
Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA

I am a relative newcomer to THINK C.  I have on several occassions gotten
an error message (the verbatim text of which I have forgotten) which
announces a ZREF error and tells me to "Remove Objects."  But having done
that as requested, the problem doesn't go away.  I can only rebuild my
application by starting over with a new project into which I load the
identical set of libraries and files.  It is as if the project file itself
was corrupted.

How am I generating the state, and how do I fix it without starting over
with a new project?  Thanks in advance.

- -Scott

- --------------------
Scott I. Chase            "The question seems to be of such a character
[e-mail]        that if I should come to life after my death
                and some mathematician were to tell me that it
                had been definitely settled, I think I would
                immediately drop dead again."      - Vandiver

+++++++++++++++++++++++++++

From: [e-mail] (Phil Shapiro)
Date: 20 Jul 92 04:00:46 GMT
Organization: Symantec Corp.

>>>>> On 19 Jul 92 20:39:37 GMT, [e-mail] (SCOTT I CHASE) said:

 > I am a relative newcomer to THINK C.  I have on several occassions
 > gotten an error message (the verbatim text of which I have
 > forgotten) which announces a ZREF error and tells me to "Remove
 > Objects."  But having done that as requested, the problem doesn't
 > go away.  I can only rebuild my application by starting over with a
 > new project into which I load the identical set of libraries and
 > files.  It is as if the project file itself was corrupted.

 > How am I generating the state, and how do I fix it without starting
 > over with a new project?  Thanks in advance.

The infamous ZREF error is caused by an assertion error in some
project manipulation code which is raised when the symbol table
appears to be corrupt. In general, this error is caused by project
corruption of some sort, and in most cases the corruption occurs
during the program's execution. Sometimes this corruption is slight,
so removing objects and recompiling will fix whatever's gone wrong.
Sometimes the project must be trashed and rebuilt from scratch.

If you're seeing this error often, even after rebuilding your project
from scratch, and if you have a large project (usually the two go hand
in hand), you should make sure that you have a copy of your project
which is never run, just compiled. I would have a backup that you
update every day (week, whatever) which you can always fall back on if
things get messed up, until you can find the bug that's causing the
problem.

    -phil
- --
   Phil Shapiro                                   Software Engineer
   Language Products Group                     Symantec Corporation
           Internet: [e-mail]

+++++++++++++++++++++++++++

From: [e-mail] (Brian Hall)
Date: 20 Jul 92 05:54:28 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

[e-mail] (Phil Shapiro) writes:

>>>>>> On 19 Jul 92 20:39:37 GMT, [e-mail] (SCOTT I CHASE) said:

> > I am a relative newcomer to THINK C.  I have on several occassions
> > gotten an error message (the verbatim text of which I have
> > forgotten) which announces a ZREF error and tells me to "Remove
> > Objects."  But having done that as requested, the problem doesn't
> > go away.  I can only rebuild my application by starting over with a
> > new project into which I load the identical set of libraries and
> > files.  It is as if the project file itself was corrupted.

> > How am I generating the state, and how do I fix it without starting
> > over with a new project?  Thanks in advance.

>The infamous ZREF error is caused by an assertion error in some
>project manipulation code which is raised when the symbol table
>appears to be corrupt. In general, this error is caused by project
>corruption of some sort, and in most cases the corruption occurs
>during the program's execution. Sometimes this corruption is slight,
>so removing objects and recompiling will fix whatever's gone wrong.
>Sometimes the project must be trashed and rebuilt from scratch.

I used to have this problem often with a +-5M project file (the app compiled
to over 1 M).  I 'fixed' the problem by raising the memory givien to
the Think C app significantly.  I think adding at least 2M was in order,
and I likely had the partition set to 4M.  Once I did that, I *never*
got the ZREF error again.  I'm sure that does not 'fix' the real problem,
but perhaps Think C is more likely to corrupt the project information
when in a low memory situation.

- --

 \ | /   | Brian Hall                 [e-mail]
 - : -   | Mark/Space Softworks       Applelink: markspace
  /|\    |                            America Online: MarkSpace
 |-+-|   |
/-\|/-\  | People don't kill people, toasters kill people.

---------------------------

From: [e-mail] (Matthew Mills)
Subject: Getting my hands on the real CLUT
Organization: California State University Sacramento
Date: Sat, 18 Jul 1992 19:36:49 GMT

Hello all,
  I need some advice and information on controlling the screens Color
  Look-up table.  I am writing a game and using machine language for
  most (if not all) the drawing, but I am having a tough time with
  setting up the indexed colors.
  The situation is this, I am moving some bullets around the screen
  and picking up the bytes that were underneath to implement some form
  of collision detection.  I would like to set up ranges of colors
  used by the good guys, and another range for the enemies.  I have
  looked into the palette manager but it is not truly associated with
  the indexes of the video memory.
  What is the proper way to look at and change the CLUT for a
  particular display?  Being a game (which takes over the whole
  screen) following the proper color manager practices is not
  important.  I know this sounds like I will get a visit from the
  Interface police but I'll do my time ;-)

Matthew

- --
| Matthew Mills                       | To do is to be - Socrates
| Technical Lab Assistant (CSUS)      | To be is to do - Plato
| mail-> [e-mail]              | Do Be Do Be Do - Sinatra

+++++++++++++++++++++++++++

From: [e-mail] (Jamie R. McCarthy)
Organization: Kalamazoo College
Date: Mon, 20 Jul 1992 00:03:18 GMT

[e-mail] (Matthew Mills) writes:
>
>  I need some advice and information on controlling the screens Color
>  Look-up table.  I am writing a game and using machine language...
>  ...I would like to set up ranges of colors
>  used by the good guys, and another range for the enemies.  I have
>  looked into the palette manager but it is not truly associated with
>  the indexes of the video memory.

It can be.  If you set color n in the palette to be
pmAnimated+pmExplicit, it will correspond to color n in the color table,
for 0 < n < theIndexOfTheLastColorInTheCLUT.

>  What is the proper way to look at and change the CLUT for a
>  particular display?  Being a game (which takes over the whole
>  screen) following the proper color manager practices is not
>  important.

If you can give up those first and last colors, use the Palette Manager.
It's actually easier than the Color Manager (it cleans up for you) and
you won't have to rip your hair out if you ever decide to put your game
in a window smaller than a full screen.

To do this, set up a palette with pmAnimated+pmExplicit colors in the
range from 1 to theSecondToLastColorInTheCLUT.  Attach the palette to
your window with SetPalette().  To change their colors, call
AnimatedPalette().  That's all there is to it, if you're writing
directly to the screen (which it sounds like you are).

>  I know this sounds like I will get a visit from the
>  Interface police but I'll do my time ;-)

Oh, you probably won't spend any time behind bars--the jails are full,
and judges are starting to let people go with just warnings.
- --
 Jamie McCarthy      Internet: [e-mail]      AppleLink: j.mccarthy
 I just got Think C and I like it so much that I had to tell the world.
 I used to be an MPW bigot, but no more.   - John Norstad, 10 July 1992

---------------------------

From: [e-mail] (Rick Zaccone)
Subject: FSpExchangeFiles Problem
Date: 17 Jul 92 01:11:03 GMT
Organization: Bucknell University, Lewisburg, Pa.

I'm having a problem with FSpExchangeFiles.

The problem occurs when I try to exchange a temporary file with a
permanent file (the file that I'm trying to save) that is on a
different volume than my system folder.  In this case, my call to
FSpExchangeFiles returns a -50, "Error in user parameter list".  This
puzzles me for two reasons.

- - The code works when the permanent file is on the same volume as the
system folder.

- - I am able to write to the temporary file and read from the permanent
file without any problems.  Doesn't this indicate that the FSSpec
records for my files are correct?

Please help.

Rick Zaccone
- --
[e-mail]

+++++++++++++++++++++++++++

From: [e-mail] (Rick Zaccone)
Date: 17 Jul 92 12:23:03 GMT
Organization: Bucknell University, Lewisburg, Pa.

A couple of people have been kind enough to point out that
FSpExchangeFiles can't work across volumes because it just exchanges
directory information.  I've reread IM Vol. VI and it does indeed make
(quick) reference to the fact that both files should be on the same
volume.

This raises some disturbing questions for me.

- - How would I do a safe save when the file I'm trying to save is not
on the start-up volume?  Specifically, where would I put the temp
file?  How have other people handled this?  Why doesn't IM address
this issue?

- - Suppose there's no easy way to do a safe save in this situation.
I'm disturbed by the fact that there would be more security in a save
to the start-up volume than to other volumes.  I would like them all
to be equally safe.

Rick Zaccone
- --
[e-mail]

+++++++++++++++++++++++++++

From: [e-mail] (Lee Fyock)
Organization: The MITRE Corporation
Date: Fri, 17 Jul 1992 12:49:02 GMT

In article <[e-mail]>,
[e-mail] (Rick Zaccone) wrote:
>
> I'm having a problem with FSpExchangeFiles.
>
> The problem occurs when I try to exchange a temporary file with a
> permanent file (the file that I'm trying to save) that is on a
> different volume than my system folder.  In this case, my call to
> FSpExchangeFiles returns a -50, "Error in user parameter list".  This
> puzzles me for two reasons.
>
> - The code works when the permanent file is on the same volume as the
> system folder.
>
> - I am able to write to the temporary file and read from the permanent
> file without any problems.  Doesn't this indicate that the FSSpec
> records for my files are correct?

I've seen this error before, usually when using a working directory
refnum in a place where a straight volume refnum is expected.  This
seems to crop up with major problems only when filesharing is on...

Lee

- ------------------------------------------------------------------------
Lee Fyock                                          The MITRE Corporation
[e-mail]                                     Bedford, Massachusetts

+++++++++++++++++++++++++++

From: [e-mail] (Jamie R. McCarthy)
Organization: Kalamazoo College
Date: Fri, 17 Jul 1992 13:51:21 GMT

[e-mail] writes:
>
>- How would I do a safe save when the file I'm trying to save is not
>on the start-up volume?  Specifically, where would I put the temp
>file?  How have other people handled this?  Why doesn't IM address
>this issue?

I don't see any reason why you would have to put the temp file in the
Temporary Items Folder (which it sounds like you're doing).  That's just
for files that remain open long enough for users to mess with them if
they're anywhere else.  :-)

If you create, write, swap, and delete the temporary file without
calling WaitNextEvent, the user will never see it, and you can put it
anywhere you want.
- --
 Jamie McCarthy      Internet: [e-mail]      AppleLink: j.mccarthy
 I'm having a lot of trouble seeing how a request that you "shut up" can be
 interpreted as "looking to other people for validation."      - Tim Pierce

+++++++++++++++++++++++++++

From: [e-mail] (Keith Rollin)
Date: 17 Jul 92 19:10:48 GMT
Organization: Taligent

In article <[e-mail]>,
[e-mail] (Rick Zaccone) writes:
>
> A couple of people have been kind enough to point out that
> FSpExchangeFiles can't work across volumes because it just exchanges
> directory information.  I've reread IM Vol. VI and it does indeed make
> (quick) reference to the fact that both files should be on the same
> volume.
>
> This raises some disturbing questions for me.
>
> - How would I do a safe save when the file I'm trying to save is not
> on the start-up volume?  Specifically, where would I put the temp
> file?  How have other people handled this?  Why doesn't IM address
> this issue?
>
> - Suppose there's no easy way to do a safe save in this situation.
> I'm disturbed by the fact that there would be more security in a save
> to the start-up volume than to other volumes.  I would like them all
> to be equally safe.

I'm not sure what the problem here is. Performing a "safe save" refers to the
process of replacing the contents of a file with new information in such a way
that the old information is preserved in case an error arises. If the old file
is on volume A, and you are writing the new file to volume B, then you are not
replacing the old file, and "safe save" techniques are not needed. Just write
the new file to volume B. If it succeeds, delete the file from volume A (if
that's what you want). I don't see a need for temp files or for calling
FSpExchangeFiles.

- --
Keith Rollin
Phantom Programmer
Taligent, Inc.


+++++++++++++++++++++++++++

From: [e-mail] (Rick Zaccone)
Date: 18 Jul 92 01:17:06 GMT
Organization: Bucknell University, Lewisburg, Pa.

I now realize my problem.  I was always creating my temporary file on
the start-up volume.  I'm not sure where I got the idea that that was
the right place to do it, but clearly it's not.  If I want to make a
temporary file so that I can use FSpExchangeFiles, then I need to do
so on the same volume as the permanent file.

Rick
- --
[e-mail]


+++++++++++++++++++++++++++

From: [e-mail] (Humayun Lari)
Date: 18 Jul 92 17:25:32 GMT
Organization: University of North Carolina, Chapel Hill

In article <[e-mail]> [e-mail] (Jamie R. McCarthy) writes:
>I don't see any reason why you would have to put the temp file in the
>Temporary Items Folder (which it sounds like you're doing).  That's just
>for files that remain open long enough for users to mess with them if
>they're anywhere else.  :-)
>
>If you create, write, swap, and delete the temporary file without
>calling WaitNextEvent, the user will never see it, and you can put it
>anywhere you want.

But what if your program crashes while it's saving, or the power goes out?
If you use the temporary items folder, at least the portion of the document
you finished saving will show up in the "Rescued Items" folder at startup. If
you put the file somewhere else, the user might not notice it, and need to
redo work unnecessarily.

Humayun Lari
([e-mail])


+++++++++++++++++++++++++++

From: [e-mail] (Jamie R. McCarthy)
Organization: Kalamazoo College
Date: Mon, 20 Jul 1992 18:01:36 GMT

[e-mail] (Humayun Lari) writes:
>[e-mail] (Jamie R. McCarthy) writes:
>>I don't see any reason why you would have to put the temp file in the
>>Temporary Items Folder...
>
>But what if your program crashes while it's saving, or the power goes out?
>If you use the temporary items folder, at least the portion of the document
>you finished saving will show up in the "Rescued Items" folder at startup. If
>you put the file somewhere else, the user might not notice it, and need to
>redo work unnecessarily.

Right.  I forgot that you can specify a temp folder on any volume.
- --
 Jamie McCarthy      Internet: [e-mail]      AppleLink: j.mccarthy
 I suppose ya don't think I was run over by a streetcar!

---------------------------

From: [e-mail] (David M Marcovitz)
Subject: Accepting AppleEvents?
Organization: University of Illinois at Urbana
Date: Thu, 16 Jul 1992 03:30:06 GMT

I am trying to write a very simple application that accepts the four
required AppleEvents.  I have been following the example in Inside Mac
VI, but I am writing in Think C, and I am having a little trouble
converting.

I mainly need the odoc event.  I have successfully installed a handler
to handle the odoc event, but when this function calls AEGetParamDesc,
it returns an error of -1704.  It seems that my AppleEvent is not
properly formed.

Does anyone have either of the following written in C:

(1) source code for a SIMPLE application that does nothing but accepts
    the four required AppleEvents, or
(2) source code for a handler function that handles the odoc
    AppleEvent.

Thanks.
- --
David M. Marcovitz                     |  internet: [e-mail]
Computer-based Education Research Lab  |            [e-mail]
University of Illinois                 |  novanet:  marco / cca / nova

+++++++++++++++++++++++++++

From: [e-mail] (Roger Allen)
Date: 16 Jul 92 22:15:55 GMT
Organization: Amdahl Corporation, Sunnyvale CA

In article <[e-mail]> [e-mail] (David M Marcovitz) writes:
>
>Does anyone have either of the following written in C:
>
>(1) source code for a SIMPLE application that does nothing but accepts
>    the four required AppleEvents, or
>(2) source code for a handler function that handles the odoc
>    AppleEvent.
>

How about the basic TCL shell program that comes with THINK C?

Roger
- --
> Roger Allen                   |                                        <
> Amdahl Computer Development   | What are you looking here for?         <
> [e-mail]           |                                        <

+++++++++++++++++++++++++++

From: [e-mail] (David M Marcovitz)
Organization: University of Illinois at Urbana
Date: Fri, 17 Jul 1992 00:47:30 GMT

[e-mail] (Roger Allen) writes:

>In article <[e-mail]> [e-mail] (David M Marcovitz) writes:
>>
>>Does anyone have either of the following written in C:
>>
>>(1) source code for a SIMPLE application that does nothing but accepts
>>    the four required AppleEvents, or
>>(2) source code for a handler function that handles the odoc
>>    AppleEvent.
>>

>How about the basic TCL shell program that comes with THINK C?

Thanks for the advice.  I had been using the TCL shell to try to
figure it out.  It helped some.  After some hacking, I finally got the
program to work, but I'm still not sure why.

- --
David M. Marcovitz                     |  internet: [e-mail]
Computer-based Education Research Lab  |            [e-mail]
University of Illinois                 |  novanet:  marco / cca / nova

+++++++++++++++++++++++++++

From: [e-mail] (Grobbins)
Date: 18 Jul 92 03:00:59 GMT
Organization: The Ortiz Organization

In article <[e-mail]> [e-mail] (David M Marcovitz) writes:
>Does anyone have either of the following written in C:
>(1) source code for a SIMPLE application that does nothing but accepts
>    the four required AppleEvents, or
>(2) source code for a handler function that handles the odoc
>    AppleEvent.

(2) is totally application dependent, so I doubt you'll find anything
more useful than Inside Mac VI's sample code.

Here's a 1-1/2 page faceless background application for System 7
which answers (1).

Grobbins                 [e-mail]

Usual disclaimers apply.

- ---


#include "AppleEvents.h"
#include "GestaltEqu.h"

#define kSleepMax 50000  // long sleep time to avoid stealing cycles

Boolean gAppleEventsFlag, gQuitFlag;
long gSleepVal;

pascal OSErr DoAEOpenApplication(AppleEvent * theAppleEvent,
                                 AppleEvent * replyAppleEvent,
                                 long refCon)
{
#pragma unused (theAppleEvent, replyAppleEvent, refCon)
  return noErr;
}

pascal OSErr DoAEOpenDocuments(AppleEvent * theAppleEvent,
                               AppleEvent * replyAppleEvent,
                               long refCon)
{
#pragma unused (theAppleEvent, replyAppleEvent, refCon)
  return errAEEventNotHandled;
}

pascal OSErr DoAEPrintDocuments(AppleEvent * theAppleEvent,
                                AppleEvent * replyAppleEvent,
                                long refCon)
{
#pragma unused (theAppleEvent, replyAppleEvent, refCon)
  return errAEEventNotHandled;
}

pascal OSErr DoAEQuitApplication(AppleEvent * theAppleEvent,
                                 AppleEvent * replyAppleEvent,
                                 long refCon)
{
#pragma unused (theAppleEvent, replyAppleEvent, refCon)
  gQuitFlag = true;
  return noErr;
}

void InitAppleEventsStuff(void)
// install Apple event handlers
{
  OSErr retCode;

  if (gAppleEventsFlag) {

    retCode = AEInstallEventHandler(kCoreEventClass, kAEOpenApplication,
                (EventHandlerProcPtr) DoAEOpenApplication, 0, false);
    if (retCode == noErr)
      retCode = AEInstallEventHandler(kCoreEventClass, kAEOpenDocuments,
              (EventHandlerProcPtr) DoAEOpenDocuments, 0, false);
    if (retCode == noErr)
      retCode = AEInstallEventHandler(kCoreEventClass, kAEPrintDocuments,
              (EventHandlerProcPtr) DoAEPrintDocuments, 0, false);
    if (retCode == noErr)
      retCode = AEInstallEventHandler(kCoreEventClass, kAEQuitApplication,
              (EventHandlerProcPtr) DoAEQuitApplication, 0, false);
    if (retCode != noErr) DebugStr("\pInstall event handler failed");
  }
}

void DoHighLevelEvent(EventRecord * theEventRecPtr)
// high-level event dispatching
{
  (void) AEProcessAppleEvent(theEventRecPtr);
}

main()
{
  OSErr retCode;
  long gestResponse;

  EventRecord mainEventRec;
  Boolean eventFlag;

  // initialize globals

  gQuitFlag = false;
  gSleepVal = kSleepMax;

  // is the Apple Event Manager available?
  retCode = Gestalt(gestaltAppleEventsAttr, &gestResponse);
  if (retCode == noErr &&
      (gestResponse & (1 << gestaltAppleEventsPresent)) != 0)
    gAppleEventsFlag = true;
  else gAppleEventsFlag = false;

  // install Apple event handlers
  InitAppleEventsStuff();

  while (!gQuitFlag) {
    eventFlag = WaitNextEvent(everyEvent, &mainEventRec, gSleepVal, nil);

    if (mainEventRec.what == kHighLevelEvent)
      DoHighLevelEvent(&mainEventRec);
  }
}


+++++++++++++++++++++++++++

From: [e-mail] (Paul Potts)
Organization: Instructional Technology Laboratory, University of Michigan
Date: Mon, 20 Jul 92 20:02:55 GMT

In article <[e-mail]> [e-mail] (David M Marcovitz) writes:
> ...After some hacking, I finally got the
>program to work, but I'm still not sure why.

Welcome to Macintosh programming! : )  Can I quote you? This sums it up
pretty well.


- --
..though I respect that a lot, I'd be fired if that were my job, after
killing Jason off and countless screaming argonauts... (They Might Be Giants)
Paul R. Potts, Software Designer --- [e-mail] <--- me!

+++++++++++++++++++++++++++

From: [e-mail] (David M Marcovitz)
Organization: University of Illinois at Urbana
Date: Mon, 20 Jul 1992 21:24:40 GMT

I believe that the important part of getting my AppleEvents handlers
to work was to declare the functions to be of type    pascal OSErr.
The "pascal" part is very important.

pascal OSErr myEventHandler(AppleEvent *event, AppleEvent *reply, long ref);

I believe this is the correct header.

- --
David M. Marcovitz                     |  internet: [e-mail]
Computer-based Education Research Lab  |            [e-mail]
University of Illinois                 |  novanet:  marco / cca / nova

---------------------------

End of C.S.M.P. Digest
**********************